The “Windows Defender Security Warning” scam starts with an alarming pop-up alert pretending to be from Microsoft stating that malware was detected on your system. The pop-up blocks access to your computer and provides a phone number, urging you to call for immediate removal of the supposed infection. However, the number actually leads to fraudulent call centers intent on stealing your personal and financial information.
This guide will uncover the manipulative techniques used in this scam and equip you with the knowledge needed to avoid becoming victimized. By learning how the criminals create a sense of urgency and leverage the trusted Microsoft brand, you can see through the deception. I’ll walk through exactly how the scam operates, what to do if you or a loved one is targeted, and preventative measures to implement.
An Overview of the “Windows Defender Security Warning” Scam
The “Windows Defender Security Warning” scam starts with an alarming pop-up alert that pretends to be from Microsoft, stating that spyware, malware, or another security threat was detected on the victim’s system by Windows Defender.
The fake “Windows Defender Security Warning” pop-up uses fear and urgency tactics, claiming that this supposed “dangerous infection” is leaking the user’s personal data, putting their identity, files, and credit card information at serious risk of theft. The pop-up completely blocks access to the computer and flashes a phone number to call for immediate removal of the infection before more harm is done.
However, this phone number routes to a fraudulent, cybercriminal-run “tech support” call center instead of the legitimate Microsoft support department. If users call the number, professional-sounding scammers pretend to be Microsoft techs and confirm that the system is critically infected. The scammers gain remote access and trick distressed victims into paying hundreds of dollars for useless services, long-term subscriptions, and fake anti-virus programs, all while stealing personal and financial data in the background.
In reality, the “Windows Defender Security Warning” pop-up has nothing to do with Microsoft, Windows Firewall, or any real malware threat. The alerts are completely fake and the phone numbers route to overseas fraudsters looking to make quick money through social engineering techniques and theft. There is no real infection – the pop-ups are solely intended to play into fear in order to get victims to call the scammers immediately for removal of non-existent security issues.
This scam has been rampant since 2016 but remains prevalent today due to the convincing techniques used by fraudsters on the phones and in the design of the fake pop-ups. The criminals frequently shift their tactics for redirecting users to the pop-ups and use targeted online ads, compromised sites, email spam, and malware infected with scripts that auto-generate the fake alerts.
Cybersecurity experts indicate this specific scam has resulted in cumulative losses in the millions for victims taken in by the effective social engineering strategies and technical tools leveraged by scammers. And the scam is still growing in scope due to the revenue it rakes in for criminal call centers.
How the “Windows Defender Security Warning” Scam Works
Here is a step-by-step look at how cybercriminals leverage the fake “Windows Defender Security Warning” pop-ups to scam victims:
1. Redirecting Users to the Pop-up
The first step is tricking users into landing on the fraudulent pop-up page. Scammers use various techniques including:
- Malicious ads on shady sites that redirect to the pop-ups when clicked.
- Hacked sites that automatically forward visitors to the scam page.
- Malware or browser extensions containing scripts that spawn the pop-ups.
- Spam emails and social media posts with links that lead to the fake warnings.
- Typosquatting sites like “windowsfirwallupdate.com” that redirect to the pop-ups.
2. The Fake “Windows Defender Security Warning” Pop-up
Once redirected, the fake pop-up appears on the user’s screen pretending to be from Windows Firewall. It displays messages such as:
“Windows Defender Security Warning: Threat Detected
Critical infection and spyware detected on your computer. Private data including passwords and personal files at risk. To prevent identity theft and hacking, call the Windows Helpdesk immediately for removal.”
The pop-ups use convincing design, language, and logos to appear legit. Users will be unable to exit or close the page normally due to code that forces it to remain open.
3. Contacting the Fraudulent Tech Support Number
Alarmed victims will call the tech support number listed on the pop-up, assuming it is Microsoft’s real helpdesk. But in reality, it routes to a scam call center operated by cybercriminals.
When victims call, the scammers answer pretending to be Microsoft support techs. They will ask about the pop-up notification and briefly “diagnose” the computer as infected based on the described error. This builds trust and makes the scam seem real.
4. Offering Fake Security Services
Next, the fraudulent “tech support agent” will confirm that malware, spyware, or a Trojan virus has been detected on the system. They claim this is urgent and needs immediate removal to prevent the supposed threats from leaking personal data, banking info, etc.
To remove the non-existent infections, the scammers pitch fake security services and software with names like “Windows Firewall Security Suite” or “Anti-virus Protection for 5 Devices.” These unnecessary services can cost anywhere from $100 to $500 or more.
The scammers apply high pressure tactics to get victims to purchase the fake security offerings right away over the phone. In reality, they are just attempting to make quick money while setting up further scams.
5. Requesting Remote Access
Whether or not victims pay for the useless security software, the fraudsters will request remote access to the computer in order to diagnose the infection and provide removal assistance. They may claim tools like LogMeIn or AnyDesk are required.
Once granted remote access, the criminals have full control to install malware, steal personal files, harvest passwords, or do anything else malicious under the guise of removing infections. No actual scans or fixes will be performed.
6. Stealing Personal and Financial Information
With remote access, the primary goal is to steal any personal or financial information stored on the device or accessible via online accounts. The scammers may:
- Steal browser cookies and session data to gain access to online accounts.
- Install keyloggers to capture passwords and sensitive data.
- Download files and photos for extortion scams.
- Connect to online bank accounts and drain funds.
- Install ransomware to encrypt data and extort money.
The scammers leverage the trust gained by posing as Microsoft support to steal as much value as possible once connected to the victim’s machine.
7. Furthering the Scam
To maximize profits, the fraudsters will keep the scam going once connected by faking additional issues. For example, they may:
- Claim new malware or viruses were discovered and more tech support is needed.
- State that the license for the security software purchased earlier has expired.
- Insist an advanced firewall is needed.
- Recommend recurring subscriptions and services to “protect the computer.”
The goal is to keep victims paying over time through recurring fraudulent charges. By the time the scam is uncovered, the cybercriminals have already inflicted significant financial fraud and identity theft in many cases.
What To Do If You Get The “Windows Defender Security Warning” Pop-up
If this alarming pop-up suddenly appears on your screen, don’t panic. And definitely do not call any number listed or provide any personal information. Here are the key steps to take:
- Close out of the browser – Try exiting the browser entirely even if the pop-up stops you from closing the tab normally. This may disrupt the code powering the scam page.
- Run a scan – Do a scan with your actual antivirus software like Malwarebytes to check for any infections. The scan will come back clean since the pop-up is not real.
- Get help removing the pop-up – If the page continues opening on your computer, you likely have adware redirecting you to the scam. Try running adware removal tools or get help removing it.
- Reset browser settings – Sometimes browser setting changes from adware trigger the pop-ups. Reset your browser to default settings to undo any unwanted changes.
- Update browsers/OS – Make sure your operating system, browsers, antivirus, and other software is updated. Out-of-date software is more vulnerable to redirects.
- Avoid the sites triggering it – Try to pinpoint any suspicious sites that seem to trigger the pop-up redirect and avoid visiting them in the future.
Do not trust anything stated in the pop-up, even if it looks official. Microsoft, Apple, and antivirus companies do not use methods like this for alerts. If your computer is truly compromised, you will be able to find evidence through legitimate means.
What To Do if You Already Called The Scam Number
If you already contacted the fraudulent tech support number in the pop-up, don’t panic. Here are the important next steps:
- End the call – Hang up the phone immediately if they ask for any financial information or request remote access to your device.
- Call your bank – If you did make a payment or give banking details, call your bank to report unauthorized charges.
- Reset online account passwords – Change the passwords for any accounts you accessed during the call. Enable two-factor authentication if possible.
- Run anti-malware scans – If the scammers connected to your device already, run full system scans with your security software and malware removal tools. This will detect if anything malicious was installed.
- Check accounts for fraudulent activity – Monitor bank accounts, credit cards, and online accounts that were accessed closely for any signs of misuse over the coming weeks. Report any unauthorized charges or activity immediately.
- Disconnect compromised devices – If the scammers gained remote access to a particular device, disconnect it from the internet and do not use it until the infection is removed. Wipe and reset the device to factory settings if necessary.
- Cancel services or subscriptions – If you paid for fake services or software, contact the scammers to cancel and demand a refund. Dispute the charges with your bank as fraudulent activity.
- Report the scam – File reports about the scam call to the FTC, FBI, IC3, and your local authorities. This helps agencies track and shut down these fraudsters.
- Educate yourself – Learn more about tech support scams to better protect yourself in the future. Share information with friends and family to prevent them from falling victim.
The most important thing if you fell for this scam is to take immediate steps to secure accounts and devices that may have been compromised. With fast action, you can minimize any potential financial loss or identity theft. But do not let embarrassment or fear prevent you from reporting the scam to authorities who can help.
How To Avoid The “Windows Defender Security Warning” Scam
While this scam can be convincing, there are ways to identify and avoid it through vigilance and preventative measures:
- Be wary of unsolicited pop-up alerts – Real security warnings do not appear as flashy pop-ups out of nowhere. Question pop-ups stating your system is compromised.
- Verify before calling numbers – Never call numbers listed in suspicious pop-ups. Look up the true customer service numbers for your software and operating system vendor.
- Don’t allow remote access – Refuse any requests for remote access from supposed tech support agents. Real companies won’t pressure you like this.
- Avoid clicking ads or notifications – Be cautious clicking on ads, pop-ups, notifications, or messages claiming security issues. Verify before clicking.
- Keep software updated – Maintain up-to-date operating systems, browsers, antivirus software, firewalls, and filters to reduce infection risks.
- Use ad blocking and anti-malware tools – Utilize AdGuard, Malwarebytes, and similar programs to detect and block tech support scam redirects.
- Don’t trust caller ID – Scammers often spoof official-looking phone numbers for big companies. Verify identities before providing information.
- Check URLs for typos – Fake sites with typos in the URLs can redirect to scam pop-ups. Verify you are visiting legitimate sites.
Raising awareness about this scam among family and friends can prevent them from being deceived as well. Report any encounters with this scam to help authorities track down these operations.
How to Remove Unwanted Apps and Malware
If a pop-up scam tricked you into downloading an unwanted program — or you suspect your device is infected — follow the free, step-by-step removal guide below to find and remove it.
Please follow the steps in order. If you get stuck or have doubts at any point, stop and ask for help in our free support forum — our team will guide you personally.
Remove Unwanted Apps and Malware from Windows-
Remove Unwanted Apps and Malware from Mac 
Remove Unwanted Apps and Malware from Android- Remove Unwanted Apps and Malware from iPhone and iPad
Remove Unwanted Apps and Malware from Windows
- STEP 1: Uninstall malicious programs from Windows
- STEP 2: Reset browsers back to default settings
- STEP 3: Use Malwarebytes Anti-Malware to remove malware and unwanted programs
- STEP 4: Use HitmanPro to scan your computer for badware
- STEP 5: Use AdwCleaner to remove adware and malicious browser policies
STEP 1: Uninstall malicious programs from Windows
In this first step, we will manually check if any unknown or malicious programs are installed on the computer. Sometimes adware and browser hijackers can have a usable Uninstall entry that can be used to remove them.
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Open the Settings app
Press Windows + I on your keyboard to open Settings. Alternatively, right-click the Start button and select “Settings” from the menu.
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Go to “Installed apps”
In the Settings window, click “Apps” in the sidebar, then select “Installed apps“.
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Find and uninstall the malicious program
Scroll through the list of installed apps and look for anything suspicious — a program you don’t remember installing, or one with a strange or generic name.
Quick tip: click “Sort by” and choose “Date installed“. Malware is usually one of the most recently installed programs, so it will appear near the top.
When you find the malicious program, click the three dots next to it and select “Uninstall“.
Didn’t find any suspicious programs? That’s fine — not all infections install visible apps. Just continue with the next step in this guide. -
Complete the uninstall
Confirm by clicking Uninstall in the message box, then follow the remaining prompts.
Read each prompt carefully — some malicious programs use confusing wording or pre-ticked boxes hoping you’ll click through without looking.
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Open the Settings app
Press Windows + I on your keyboard to open Settings. Alternatively, click the Start button on the taskbar and select “Settings” (the gear icon).
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Click on “Apps”
In the “Windows Settings” window, click “Apps“. The “Apps & Features” section should open by default — if it doesn’t, select it from the list on the left.
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Find and uninstall the malicious program
Scroll through the list of installed apps and look for anything suspicious — a program you don’t remember installing, or one with a strange or generic name.
Quick tip: click “Sort by” and choose “Install date“. Malware is usually one of the most recently installed programs, so it will appear near the top.
When you find the malicious program, click on it and select “Uninstall“.
Didn’t find any suspicious programs? That’s fine — not all infections install visible apps. Just continue with the next step in this guide. -
Complete the uninstall
Confirm by clicking Uninstall in the message box, then follow the remaining prompts.
Read each prompt carefully — some malicious programs use confusing wording or pre-ticked boxes hoping you’ll click through without looking.
With the malicious programs removed, you’re ready for the next step in this guide.
STEP 2: Reset browsers back to default settings
In this step, we will remove spam notifications, malicious extensions, and change to default any settings that might have been changed by malware.
Please note that a Chrome or Edge reset turns off all your extensions, and a Firefox refresh removes them. Your bookmarks and favorites stay intact. For each browser that you have installed on your computer, please click on the browsers tab below and follow the displayed steps to reset that browser.
Reset Chrome for Windows to default settings
We will now reset your Chrome browser settings to their original defaults. This will reset your startup page, new tab page, search engine, and pinned tabs. It will also disable all extensions and clear temporary data like cookies. Your favorites, history, and saved passwords will not be cleared.
Open the Chrome menu
Open Google Chrome and click the three-dot (⋮) icon in the top-right corner.
Open Chrome Settings
Select Settings from the Chrome menu.
Select “Reset settings”
Look at the menu on the left side of the Settings page. Scroll down and click Reset settings.
Restore Chrome’s original settings
Click Restore settings to their original defaults.
Confirm the Chrome reset
A confirmation window will appear. Click Reset settings.
This will:
- Restore the default search engine, homepage, and new tab page
- Reset startup pages and pinned tabs
- Reset site permissions, such as notifications and pop-ups
- Disable installed extensions
- Clear temporary cookies and website data
Don’t worry: Chrome will not delete your bookmarks, browsing history, or saved passwords. If you’re signed in to Chrome, the reset applies on all devices where you’re signed in.
Restart Chrome and perform a test search. If your searches now open normally in Google, you can stop here.
If searches are still redirected through shady domains complete the additional step below.
Remove persistent search hijacker data
Only complete this step if the redirect continues after resetting Chrome.
Some browser hijackers hide inside Chrome’s local search-engine database. A standard Chrome reset may not remove this database, which is why searches can continue to pass through shady sites.
The following procedure creates a backup of the affected database and allows Chrome to build a new, clean version. This is safer and less disruptive than deleting the entire Chrome profile.
First, prevent Chrome Sync from restoring the hijacked settings:
- Open a new Chrome tab.
- Copy the following address, paste it into Chrome’s address bar, and press Enter:
chrome://settings/syncSetup/advanced - Under Manage what you sync, select Customize sync.
- Turn off Settings and Extensions.
- You can leave Bookmarks and Passwords enabled so your important data remains synchronized.
Note: Some newer Chrome versions may automatically redirect this address to the Google Account settings page. If that happens, locate the list of synchronized Chrome data and turn off Settings and Extensions there.
Now save anything you are working on and close every Chrome window.
Run the cleanup command:
- Press the Windows key on your keyboard.
- Type PowerShell.
- Open Windows PowerShell. Administrator access is not required.
- Copy the entire command shown below.
- Right-click inside the PowerShell window to paste the command, then press Enter.
- If Windows warns you about pasting multiple lines, select the option to continue.
$stamp = Get-Date -Format "yyyyMMdd-HHmmss"
Get-Process chrome -ErrorAction SilentlyContinue |
Stop-Process -Force
$root = "$env:LOCALAPPDATA\Google\Chrome\User Data"
if (Test-Path $root) {
$profiles = Get-ChildItem $root -Directory |
Where-Object {
$_.Name -eq "Default" -or
$_.Name -match "^Profile \d+$"
}
foreach ($profile in $profiles) {
foreach ($name in @(
"Web Data",
"Web Data-journal",
"Web Data-wal",
"Web Data-shm"
)) {
$file = Join-Path $profile.FullName $name
if (Test-Path $file) {
$backup = "$file.search-hijacker-backup-$stamp"
Move-Item -LiteralPath $file -Destination $backup
Write-Host "Backup created: $backup"
}
}
}
}
Write-Host ""
Write-Host "Chrome search data has been cleaned."
Write-Host "You can now reopen Chrome."Wait until PowerShell displays the following message:
Chrome search data has been cleaned.
You can now reopen Chrome.
Close PowerShell and reopen Google Chrome. Chrome will automatically create a clean search database for every local profile.
Next, copy the following address, paste it into Chrome’s address bar, and press Enter:
chrome://settings/searchEngines
Make sure Google is selected as the default search engine. Test several searches from the address bar and confirm that they no longer pass through shady search engines.
Your important Chrome data is protected: the PowerShell cleanup does not remove bookmarks, saved passwords, browsing history, cookies, or installed extensions. However, it may reset locally stored Autofill addresses, payment cards saved only on this computer, and form suggestions.
The original search database is not deleted. PowerShell renames it and adds
search-hijacker-backupto its filename so it can be recovered if necessary.Keep Settings and Extensions synchronization disabled while testing Chrome. Do not enable every extension at once. Enable only the extensions you recognize, one at a time, and test Chrome after each one.
If the redirect returns after enabling a particular extension, remove that extension immediately.
Reset Firefox for Windows to default settings
We will now reset your Firefox browser settings to their default. The reset feature fixes many issues by restoring Firefox to its factory default state while saving your essential information like bookmarks, passwords, web form auto-fill information, browsing history, and open tabs.
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Open the Firefox menu and click “Help and Report”
Click the three horizontal lines in the top-right corner of Firefox to open the main menu, then select “Help and Report“.
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Click “More troubleshooting information”
In the Help and Report menu, click “More troubleshooting information“.
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Click “Refresh Firefox”
On the “Troubleshooting Information” page, click the “Refresh Firefox” button in the “Give Firefox a tune up” box in the top-right area of the page.
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Confirm the refresh
In the confirmation window, click “Refresh Firefox” again. This removes extensions, themes, and customized settings — the usual hiding places for browser hijackers — while keeping your bookmarks, history, and saved passwords safe.
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Click “Finish”
Firefox will close, reset itself to default settings, and reopen with a window listing the information that was restored. Click “Finish“. Then test Firefox before you add back any extensions.
About the “Old Firefox Data” folder: Firefox saves a copy of your old profile on your desktop. If something you need is missing after the reset, you can recover it from this folder. Otherwise, delete the folder — it contains sensitive data like passwords and cookies, and may also still hold the malicious files you just removed.
Reset Microsoft Edge to default settings
We will now reset your Microsoft Edge browser settings to their default. This will reset your startup page, new tab page, search engine, and pinned tabs. It will also disable all extensions and clear temporary data like cookies. Your favorites, history, and saved passwords will not be cleared.
Updated for Microsoft Edge on Windows 10 and Windows 11 — July 2026.
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Open the Edge menu and click “Settings”
Open Microsoft Edge. In the top-right corner, click the three-dot (…) icon, then click Settings.
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Prevent the unwanted settings from returning through Edge Sync
If you are signed in to Microsoft Edge, a bad setting or extension may be stored in your Microsoft account and return after the reset.
Copy the following address, paste it into the Edge address bar, and press Enter:
edge://settings/profiles/syncOn the Sync page, turn off these two options:
- Settings
- Extensions
You can leave Favorites and Passwords turned on.
If Edge says that sync is already off, simply continue to the next step.
Important: Edge Sync settings are separate for each profile. If you use more than one Edge profile, switch to each affected profile and repeat this step.
You do not need to sign out of your Microsoft account or delete the Edge profile.
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Open “Reset settings”
In the left sidebar, click Reset settings.
You can also open the reset page directly. Copy the following address, paste it into the Edge address bar, and press Enter:
edge://settings/reset
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Click “Restore settings to their default values”
Click Restore settings to their default values.
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Confirm the reset
In the confirmation dialog, click Reset.
This resets the startup page, new tab page, search engine, and pinned tabs. It also disables all extensions and clears temporary site data, such as cookies.
Don’t worry: your favorites, browsing history, and saved passwords will not be deleted.
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Check your extensions before turning them back on
Copy the following address, paste it into the Edge address bar, and press Enter:
edge://extensionsRemove any extension you do not recognize or no longer use. Pay particular attention to extensions related to search, coupons, shopping, PDF conversion, browser protection, new tabs, or video downloading.
Do not turn all extensions back on at the same time. Enable only the extensions you recognize and trust.
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Select a trusted search engine
Copy the following address, paste it into the Edge address bar, and press Enter:
edge://settings/searchEnginesSelect Bing, Google, DuckDuckGo, or another search provider you trust and make it the default. This address opens the list of search engines; the default is set one page back, on Address bar and search, under Search engine used in the address bar.
Remove any unknown search engines from the list, especially providers with strange names or addresses that you did not add yourself: click More actions (…) next to the engine and remove it.
Restart Edge and perform a search from the address bar. If searches are no longer redirected, you can stop here.
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If the redirect remains, clean the corrupted search data without deleting the Edge profile
Use this additional step only if Edge continues to redirect searches after the normal reset.
This command cleans the search-engine database from every local Edge profile while keeping your favorites, saved passwords, browsing history, cookies, and profiles.
Before continuing: save anything you are working on because the command will close Microsoft Edge.
- Open the Windows Start menu.
- Type PowerShell.
- Open Windows PowerShell. Administrator access is not required.
- Copy the entire command below.
- Paste it into PowerShell and press Enter.
$stamp = Get-Date -Format "yyyyMMdd-HHmmss" $root = Join-Path $env:LOCALAPPDATA "Microsoft\Edge\User Data" Get-Process -Name msedge -ErrorAction SilentlyContinue | Stop-Process -Force -ErrorAction SilentlyContinue Start-Sleep -Seconds 2 if (-not (Test-Path -LiteralPath $root)) { Write-Host "The Microsoft Edge profile folder was not found:" Write-Host $root return } $profiles = Get-ChildItem -LiteralPath $root -Directory | Where-Object { $_.Name -eq "Default" -or $_.Name -match "^Profile \d+$" } $movedFiles = 0 foreach ($profile in $profiles) { foreach ($name in @( "Web Data", "Web Data-journal", "Web Data-wal", "Web Data-shm" )) { $file = Join-Path $profile.FullName $name if (Test-Path -LiteralPath $file) { $backup = "$file.search-reset-backup-$stamp" try { Move-Item -LiteralPath $file -Destination $backup -ErrorAction Stop Write-Host "Cleaned: $($profile.Name)\$name" $movedFiles++ } catch { Write-Warning "Could not clean: $file" } } } } Write-Host "" if ($movedFiles -gt 0) { Write-Host "Microsoft Edge search data has been cleaned." -ForegroundColor Green Write-Host "You can now reopen Microsoft Edge." } else { Write-Host "No Edge search database files were found." -ForegroundColor Yellow }The command does not permanently delete the original files. It renames them as backup files, and Edge creates a clean search database when it starts again.
Note: this additional cleanup may also reset saved form-fill suggestions, saved addresses, payment cards saved only on this computer, and manually added search engines. It does not delete favorites, passwords, or browsing history.
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Reopen Edge and test the browser
Open Microsoft Edge again, visit edge://settings/searchEngines, and select your preferred search engine (one page back, on Address bar and search, under Search engine used in the address bar).
Perform several searches from the address bar to confirm that the redirect is gone.
Keep synchronization for Settings and Extensions turned off until you are certain that the computer and extensions are clean. If you enable them again, turn them on one at a time and test Edge after each change.
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If Edge still redirects your searches
Open edge://policy. If this is your personal computer and Edge displays unknown policies such as ExtensionInstallForcelist or DefaultSearchProvider, the hijacker may be installed outside the browser profile.
In that situation, continue with the next malware-removal steps and run a complete antivirus scan. If the computer belongs to a company or school, contact its IT administrator before changing any policies.
STEP 3: Use Malwarebytes Anti-Malware to remove malware and unwanted programs
In this third step, we will install Malwarebytes to scan and remove any infections, adware, or potentially unwanted programs that may be present on your computer.
Malwarebytes is one of the most popular and trusted anti-malware tools for Windows — and it’s completely free for removing infections. It catches threats that many antivirus programs miss, including adware, browser hijackers, and trojans. Follow the steps below to scan your PC and remove what Malwarebytes finds.
Download Malwarebytes
Click the button below to download the latest version of Malwarebytes for Windows from the official source. The free version is all you need — it will scan your computer and remove adware, browser hijackers, and other malicious software at no cost.
Download MalwarebytesOfficial installer for Windows 11 and 10. Your download starts right away.Want real-time protection? See Malwarebytes Premium
Malwarebytes Free for WindowsScans and removes malware at no cost-
Install Malwarebytes
When the download finishes, open your Downloads folder and double-click the MBSetup file. If Windows shows a User Account Control pop-up, click “Yes” to allow the installation.
Follow the On-Screen Prompts to Install Malwarebytes
The setup wizard will walk you through a few quick screens:
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Choose where you’re installing the program — “Personal Computer” or “Work Computer” — then click Next.
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Malwarebytes will now install on your device. This usually takes under a minute.
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When installation is complete, the “Welcome to Malwarebytes” screen will open automatically.
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On the final screen, click Open Malwarebytes to launch the program.
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Optional: Check for rootkits with a Custom Scan
You don’t need to change any settings for a normal scan. The standard Threat Scan in the next step is enough for most problems, so you can go straight to it.
If you also want to check for rootkits, use a Custom Scan. In current versions of Malwarebytes, rootkit scanning is only available there:
- On the Scanner tile, click the three-dot menu and select Advanced Scan.
- Choose Custom Scan. In its options, check Scan for rootkits.
- Select your system drive (usually C:\) as the location to scan, then start the scan. It takes longer than a Threat Scan.
- When it finishes, review and quarantine the results as described in the steps below.
Rootkit scanning isn’t available on Windows devices with ARM processors.
Start the Scan
Click the blue Scan button. Malwarebytes will automatically update its virus database and start checking your computer for malware.
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Wait for the Scan to Finish
The scan checks your entire system for browser hijackers and other malicious programs, so it can take 5 to 20 minutes depending on your computer. Feel free to do something else — just check back occasionally to see the progress.
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Quarantine the Detected Threats
When the scan is done, you’ll see a list of everything Malwarebytes found — malware, adware, and potentially unwanted programs. Click the “Quarantine” button to remove all of them at once.
Malwarebytes will now remove the malicious files and registry entries and move them safely into quarantine.
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Restart Your Computer
Some threats can only be fully removed after a reboot. If Malwarebytes asks you to restart, click Yes. Once you’re logged back in, Malwarebytes has finished removing the threats it found.
STEP 4: Use HitmanPro to scan your computer for badware
In this next step, we will scan the computer with HitmanPro to check for any other malicious programs that may be installed on your device.
HitmanPro is a second-opinion scanner — it’s designed to catch what your main antivirus might have missed. Instead of relying on a single detection engine, it checks the behavior of files in the locations where malware usually hides. Anything suspicious is checked online, where it’s analyzed by several antivirus engines in HitmanPro’s Scan Cloud.
Good news: scanning is completely free, with no limits. You only need a license when it’s time to remove what was found — and even then, you can activate a free one-time 30-day trial to remove what it finds at no cost. The trial works once per computer. After that, removal needs a paid license, and the purchase screen shows the current price.
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Download HitmanPro
Click the button below to download HitmanPro. Remember — the scan is free, so you have nothing to lose by checking your PC.
Download HitmanProFree scan. Removing threats needs the free 30-day trial. Opens the official HitmanPro page in a new tab.
HitmanProSecond-opinion malware scanner from Sophos -
Install HitmanPro
When the download finishes, open your Downloads folder and double-click the file “hitmanpro_x64.exe”. (On 32-bit Windows 10, the file is named “hitmanpro.exe”.)
If a User Account Control pop-up asks whether HitmanPro can make changes to your device, click “Yes” to continue.
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Follow the On-Screen Prompts
On the HitmanPro start screen, click “Next” to begin the system scan. No lengthy setup required — it goes straight to work.
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Wait for the Scan to Finish
HitmanPro will now check your computer for malicious programs. This usually takes just a few minutes thanks to its cloud-based scanning.
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Review the Results and Click “Next”
When the scan is done, HitmanPro will show you everything it found. Click “Next” to remove the detected threats.
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Click “Activate Free License”
To remove the malicious files, click the “Activate free license” button. This starts your free 30-day trial — no payment details needed — and unlocks the full cleanup.
When the removal is complete, HitmanPro will show a summary of everything it cleaned. Click Next, then click Reboot if prompted. If there’s no reboot prompt, click Close. Then check whether the problems you noticed have stopped. If they come back, save the HitmanPro log and ask for help in our forum.
STEP 5: Use AdwCleaner to remove adware and malicious browser policies
In this final step, we will use AdwCleaner to remove the malicious browser policies that were set by browser hijackers on your computer and delete malicious browser extensions.
AdwCleaner is a free on-demand scanner that specializes in adware, browser hijackers, and unwanted toolbars — the exact threats that mainstream antivirus programs often miss. It also includes tools that repair the damage malware leaves behind, like hijacked browser settings and malicious policies. It’s a quick scan that’s well worth running.
-
Download AdwCleaner
Click the button below to download AdwCleaner — it’s free, portable, and requires no installation.
Download AdwCleanerOpens the official download page in a new tab.
Malwarebytes AdwCleanerRemoves adware and unwanted programs at no cost -
Run AdwCleaner
Open your Downloads folder and double-click the file named “adwcleaner.exe“. There’s no installation — the program starts right away.
If Windows asks whether you want to allow AdwCleaner to run, click “Yes“. When the license agreement appears, click I agree to continue.
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Leave “Reset Chrome policies” off unless you need it
AdwCleaner can reset Chrome policies, the settings that malware sometimes uses to lock your browser so you can’t change it back. This option removes every Chrome policy, including legitimate ones set by an employer, a school, or parental-control software, so leave it off for a normal scan.
AdwCleaner applies this option only if you run Basic Repair at the end of the cleanup. Malwarebytes advises running Basic Repair only when a support agent asks you to, and it also runs every other repair action that is turned on in the same list. If this is your own personal PC and chrome://policy in Chrome lists policies you didn’t set, ask for help in our forum instead. On a work or school computer, ask the IT administrator.
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Start the Scan
Click “Dashboard” on the left side of the window, then click the “Scan Now” button.
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Wait for the Scan to Finish
AdwCleaner will now check your computer for adware and other malware. This usually takes only a few minutes — it’s one of the fastest scanners around.
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Quarantine the Detected Threats
When the scan finishes, AdwCleaner lists everything it found. Review the list and uncheck any program you installed on purpose and want to keep, then click Next. If AdwCleaner also found preinstalled software, it shows that list next. Review it the same way, then click “Quarantine“. Older versions show the Quarantine button on the first list, as in the image below.
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Click “Continue” to Finish the Cleanup
Save any open work first — AdwCleaner needs to close your open programs before it can clean. When you’re ready, click the “Continue” button.
AdwCleaner will now move the selected items to quarantine. If it asks you to restart your PC, allow it. When you’re back in Windows, AdwCleaner may offer a Basic Repair. Click Skip Basic Repair. Malwarebytes recommends running Basic Repair only when a support agent asks you to. Then check whether the problems you noticed have stopped.
When you’ve finished these steps, check whether the problems you noticed have stopped. If they continue, see the options below.
If you are still having problems with your computer after completing these instructions, then please follow one of the steps:
- Run a computer scan with ESET Online Scanner
- Ask for help in our Windows Malware Removal Help & Support forum.
Remove Unwanted Apps and Malware from Mac
- STEP 1: Remove malicious profiles
- STEP 2: Delete malicious apps
- STEP 3: Reset browsers back to default settings
- STEP 4: Run a scan with Malwarebytes for Mac to remove malware
STEP 1: Remove malicious profiles
Profiles are used by IT admins in businesses to control the behavior of their Macs. These profiles can configure a Mac to do many different things, some of which are not otherwise possible.
When it comes to home users, adware and browser hijackers are using the configuration profile to prevent users from removing malicious programs from the computer. This also prevents the user from changing that behavior in the browser’s settings.
In this first step, we will check your computer to see if any configuration profiles are installed. To do this, follow the below steps:
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Open “System Settings”
From the Apple menu () in the top-left corner of the screen, select System Settings. (On macOS Monterey and earlier, this is called System Preferences.)
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Look for “Profiles”
Where you find configuration profiles depends on your version of macOS:
macOS Sequoia (15) and later: click General in the sidebar, then click Device Management. You may need to scroll down.
macOS Ventura (13) and Sonoma (14): click Privacy & Security in the sidebar, then click Profiles near the bottom.
macOS Monterey (12) and earlier: in System Preferences, click Profiles.
You can also type “Profiles” in the search box.
No profiles listed, or no Profiles section at all? That means no configuration profiles are installed on your Mac, which is completely normal. Skip ahead to the next step of this guide. -
Remove the malicious profiles
Malware uses configuration profiles to lock your browser settings — forcing a fake search engine or homepage on you and preventing you from changing it back. If you see a profile you don’t recognize (and your Mac isn’t managed by your workplace or school), select it, press the − (minus) button, and click Remove to confirm.
STEP 2: Delete malicious apps
In this second step, we will try to identify and remove any malicious apps and files that might be installed on your computer. Sometimes redirects or adware programs can have usable Uninstall entries that can be used to remove these programs.
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Quit the malicious programs
Check the Apple menu bar in the top-right corner of your screen. If you see an icon you don’t recognize, click it and select Quit. This stops the malware from running so it can’t interfere while we remove it.
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Open “Finder”
Click the Finder icon in your dock.
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Click on “Applications”
In the Finder sidebar, click “Applications“.
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Find and remove the malicious app
Scroll through the list of installed apps and look for anything suspicious — an app you don’t remember installing, or one with a strange or generic name. When you find it, right-click it and select “Move to Trash“.
Some known malicious programs to look for: SearchMine, TakeFresh, TopResults, FeedBack, ApplicationEvents, GeneralOpen, PowerLog, MessengerNow, ImagePrime, GeneralNetSearch, Reading Cursors, GlobalTechSearch, PDFOnline-express, See Scenic Elf, MatchKnowledge, Easy Speedtest, and WebDiscover. The names change constantly, though — so treat any app you can’t account for as suspect.
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Empty the Trash
Before you empty the Trash, check that it doesn’t hold anything else you want to keep, because emptying it permanently deletes everything in it. Then right-click the Trash icon in your dock and select “Empty Trash“.
Check login items and background apps
Malware often sets itself to start automatically. Open the Apple menu > System Settings, click General, then click Login Items & Extensions (called Login Items in macOS Ventura and Sonoma). Look for apps you don’t recognize in the list of items that open at login and in the list of apps allowed to run in the background. Select an unwanted item and click the Remove (−) button, or turn off its switch.
This check doesn’t delete any files. Note the names you find, because they help you spot related files in the next step.
Find and remove the malicious files
Malware on Mac uses launch agents and launch daemons — small files that automatically restart the malware every time you boot your Mac. We’ll check the four folders where they hide:
- Click the desktop to make sure you’re in Finder, then open the “Go” menu and click “Go to Folder“.
- Copy and paste each of the paths below into the window, one at a time, then double-click the matching folder that appears:
- /Library/LaunchAgents
- ~/Library/LaunchAgents
- /Library/Application Support
- /Library/LaunchDaemons
- In each folder, look for suspicious .plist files — typically named after the malware or with odd, random-looking names. Examples seen in past infections include “installmac.AppRemoval.plist”, “myppes.download.plist”, “mykotlerino.ltvbit.plist”, and “com.myppes.net-preferences.plist”. A name alone is not proof. For example, “com.adobe.fpsaud.plist” belongs to Adobe’s own Flash Player updater. When you find a malicious file, move it to the Trash — then empty the Trash again when you’re done.
Be careful: these folders also contain files belonging to legitimate apps — especially /Library/Application Support, where programs like Adobe, Google, and Microsoft store their data. Only delete files you’re confident are malicious. If you’re unsure about a file, search its exact name online first, or leave it in place and continue with the Malwarebytes scan later in this guide.
- Click the desktop to make sure you’re in Finder, then open the “Go” menu and click “Go to Folder“.
STEP 3: Reset browsers back to default settings
In this third step, we will remove spam push notifications and malicious extensions, and change to default any settings that might have been changed by malware.
For each browser that you have installed on your computer, please click on the tab below and follow the displayed steps to reset that browser.
Remove malicious extensions and settings from Safari
To remove malware from Safari we will check if there are any malicious extensions installed on your browser and what settings have been changed by this malicious program.
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Go to Safari’s “Settings”.
On the menu bar, click the “Safari” menu and select “Settings”. In older versions of Safari, this menu item is called “Preferences”.
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Check Homepage.
This will open a new window with your Safari settings, opened to the “General” tab. Some browser hijackers may change your default homepage, so in the Homepage field make sure it’s a web page you want to use as your start-up page.
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Click “Extensions”
Next, click on the “Extensions” tab.
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Find and uninstall malicious extensions.
The “Extensions” screen will be displayed with a list of all the extensions installed on Safari. Look out for any suspicious browser extension that could be behind all the drama – anything you don’t remember downloading or that doesn’t sound like a genuine extension. By default, there are no extensions installed on Safari so it’s safe to remove an extension
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Remove spam notifications ads
In Safari’s settings, click Websites, then click Notifications. Find the website that sends the spam notifications, then choose Deny from the menu next to it.
To stop other websites from asking, you can also deselect “Allow websites to ask for permission to send notifications“. This only blocks new requests. It doesn’t turn off websites you already allowed, so deny those websites as well.
You can also turn off a website’s notifications in System Settings > Notifications. Under Application Notifications, click the website and turn off Allow Notifications.
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Remove the data stored by the unwanted website.
In the Safari menu, choose “Settings…”, select “Privacy” at the top of the new window that appears, and then click the “Manage Website Data” button.
In the next dialog box, search for or select the website that showed the spam or redirects, then click “Remove“. Click Done when you’re finished.
Avoid “Remove All” unless you really need it. It deletes the data of every website and can sign you out of all of them.
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Empty Safari Caches.
From your Safari menu bar, click Safari and select Settings, then select the Advanced tab. Enable the checkbox “Show features for web developers“. In older versions of Safari, this checkbox is called “Show Develop menu in menu bar”.
From the menu bar select Develop, then click on Empty Caches as seen in the image below.
Remove malware from Chrome for Mac
To remove malware from Chrome for Mac we will reset the browser settings to their defaults. This restores the default search engine, homepage, new tab page, and pinned tabs. It also resets site permissions, clears cookies and site data, and turns off your extensions and themes. Your bookmarks and saved passwords are not deleted. If you’re signed in to Chrome, the reset applies on all devices where you’re signed in.
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Click on the three dots at the top right and go to Settings.
Click on Chrome’s main menu button, represented by three dots at the top right corner. Now click on the menu option labeled Settings, which will open the basic settings screen, as shown by the numbered box in the picture below.
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In the left sidebar, click on the “Reset settings” option.
In the left sidebar, click on “Reset settings“.
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Click “Restore settings to their original defaults”.
Now click on “Restore settings to their original defaults” as shown in the image below.
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Click “Reset settings” button.
A confirmation dialog should now be displayed, detailing the components that will be restored to their default state should you continue with the reset process. To complete the restoration process, click on the “Reset settings” button.
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(Optional) Stop sync from bringing the problem back.
If a malicious extension or setting comes back after the reset, Chrome sync may be restoring it from your Google Account. Open Chrome Settings > You and Google. If you see Sync and Google services > Manage what you sync, choose Customize sync and turn off Settings and Extensions. In newer versions of Chrome, click your account name, then Choose what to save in your Google Account, and turn off the same two items. Then remove the unwanted extension again.Don’t use the “Delete data” or “Clear data” option on your Google Account’s Chrome data page to fix this. It deletes the Chrome data saved in your Google Account, such as synced bookmarks, passwords, and history, and you don’t need it to remove an extension.
Remove malware from Firefox for Mac
To remove malware from Firefox for Mac we will reset the browser settings to its default. The reset feature fixes many issues by restoring Firefox to its factory default state while saving your essential information like bookmarks, passwords, web form auto-fill information, browsing history, and open tabs.
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Go to the “Help and Report” menu.
Click on Firefox’s main menu button, represented by three horizontal lines. When the drop-down menu appears, select the option labeled “Help and Report“.
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Click “More troubleshooting information”.
Next click on the “More troubleshooting information” option. This opens the Troubleshooting Information page, as shown by the numbered box in the image below. You can also open it by typing about:support in the address bar.
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Click on “Refresh Firefox”
Click the “Refresh Firefox” button in the “Give Firefox a tune up” box in the upper-right corner of the “Troubleshooting Information” page.
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Confirm.
To continue, click on the “Refresh Firefox” button in the new confirmation window that opens.
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Click on “Finish”.
Firefox will close itself and will revert to its default settings. When it’s done, a window will list the information that was imported. Click on the “Finish“.
STEP 4: Run a scan with Malwarebytes for Mac to remove malware
In this final step, we will scan the computer with Malwarebytes for Mac to find and remove any malicious programs that might be installed on your Mac.
Malwarebytes for Mac is a free on-demand scanner that removes the malware other security software tends to miss — adware, browser hijackers, and unwanted programs included. Cleaning an infected Mac with Malwarebytes has always been completely free, and it’s our go-to recommendation. Follow the steps below to scan your Mac and remove what Malwarebytes finds.
-
Download Malwarebytes for Mac
Click the button below to download the latest version of Malwarebytes for Mac.
Download MalwarebytesOfficial installer for macOS. Your download starts right away.Want real-time protection? See Malwarebytes PremiumMalwarebytes Free for MacScans and removes malware at no cost -
Open the Malwarebytes setup file
When the download finishes, open your Downloads folder and double-click the setup file to begin the installation.
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Follow the On-Screen Prompts to Install Malwarebytes
The Malwarebytes for Mac Installer will guide you through a few quick screens. Click “Continue” and keep following the prompts until the installation completes.
When the installation is complete, Malwarebytes opens to the Welcome to Malwarebytes screen. Click “Get started“.
Malwarebytes needs Full Disk Access to check your whole Mac. When it asks, open System Settings > Privacy & Security > Full Disk Access, turn on Malwarebytes (it may be listed as Malwarebytes Protection), and confirm with your password or Touch ID. Then return to Malwarebytes. On macOS Monterey and earlier, this setting is in System Preferences > Security & Privacy > Privacy.
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Select “Personal Computer” or “Work Computer”
Malwarebytes will ask what type of computer you’re installing it on. Click either Personal Computer or Work Computer, whichever applies.
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Start the Scan
Click the “Scan” button. Malwarebytes will automatically update its detection database and begin checking your Mac for malware.
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Wait for the Scan to Finish
Malwarebytes will scan your Mac for adware, browser hijackers, and other malicious programs. This can take a few minutes, so feel free to do something else — just check back occasionally to see the progress.
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Quarantine the Detected Threats
When the scan is done, you’ll see a list of everything Malwarebytes found. Click the “Quarantine” button to remove all the threats at once.
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Restart Your Mac
Malwarebytes will now remove all the malicious files it found. Some threats can only be fully removed after a reboot — if Malwarebytes asks you to restart, allow it. Once you’re logged back in, check whether the problems you noticed have stopped. If they come back, save the scan report and ask for help in our forum.
When you’ve finished these steps, check whether the problems you noticed have stopped. If they continue, see the options below.
If you are still experiencing problems while trying to remove a malicious program from your computer, please ask for help in our Mac Malware Removal Help & Support forum.
Remove Unwanted Apps and Malware from Android
- STEP 1: Uninstall malicious apps
- STEP 2: Stop spam notifications and redirects in your browser
- STEP 3: Use Malwarebytes for Android to remove malicious apps
STEP 1: Uninstall malicious apps
In this first step, we will check if any malicious apps are installed on your phone. Sometimes browser hijackers or adware apps can have usable Uninstall entries that can be used to remove these apps.
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Open the “Settings” menu.
Tap on the “Settings” app from your phone menu or home screen.
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Tap on “Apps”.
When the “Settings” menu opens, tap on “Apps” to see all the installed applications on your phone. On Pixel and some other phones, tap “See all apps” next.
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Find the malicious app.
The “Apps” screen will be displayed with a list of all the applications that are installed on your phone. Scroll through the list and look out for any suspicious app that could be behind all the drama – anything you don’t remember downloading or that doesn’t sound like a genuine program.
Most often, cyber criminals hide malware inside video or photo editing apps, weather apps, and camera apps.
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Uninstall the malicious app
When you find a suspicious or malicious app, tap on it to uninstall it. This won’t start the app but will open up the app details screen. If the app is currently running press the “Force stop” button, then tap on “Uninstall”.
A confirmation dialog should be displayed to confirm you want to uninstall the app, tap on “OK” to remove the malicious app from your phone.
STEP 2: Stop spam notifications and redirects in your browser
In this second step, we will stop spam notifications in your browser. If unwanted pages or redirects still appear after that, we will reset the browser by clearing its app storage. That is a last resort, because it can delete data that isn’t synced.
Android browsers don’t have a single “reset settings” button like browsers on a computer, but they do let you control what each website is allowed to do. Start with the least disruptive fix: block the spam site’s notifications in the browser’s settings. In Chrome, you can also delete cookies and site data: tap More (three dots) > Delete browsing data.
Clear the browser’s app storage only if unwanted pages or redirects keep coming back. It works like a full reset, but it also deletes data that isn’t synced, so treat it as a last resort.
Remove malware from Chrome for Android
First, block the spam site’s notifications:
- Open Chrome, tap the More button (three dots) in the top-right corner, and tap Settings.
- Tap Site settings, then tap Notifications.
- Find the spam site in the list and turn off the switch next to it, or tap the site and block its notifications. To stop other sites from asking, you can also turn off the switch at the top.
If unwanted pages or redirects keep appearing, clear Chrome’s storage (last resort):
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Open the “Settings” menu.
Tap on the “Settings” app from your phone menu or home screen.
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Tap on “Apps”.
When the “Settings” menu opens, tap on “Apps” to see all the installed applications on your phone.
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Find and tap on Chrome.
The “Apps” screen will be displayed with a list of all the apps installed on your phone. Scroll through the list until you find the Chrome app, then tap on it to open the app’s details.
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Tap “Storage”.
When Chrome’s app info menu is displayed, tap on “Storage” (on Pixel phones, “Storage & cache“).
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Tap “Manage Space”.
Under the storage settings, tap “Manage space” (called “Manage storage” on some phones). Don’t tap “Clear cache”, because it doesn’t reset Chrome.
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Tap “Clear all data”.
Tap “Clear all data” to delete all Chrome’s data including accounts, bookmarks, and your settings to reset the default settings.
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Confirm by tapping “Ok”.
A confirmation dialog should now be displayed, detailing the components that will be restored to their default state should you continue with the reset process. To complete the restoration process, tap “Ok“.
Remove malware from Firefox for Android
First, block the spam site’s notifications:
- Open Firefox, tap the menu button (three dots), and tap Settings.
- Tap Site permissions, then tap Exceptions.
- Tap the spam site, then set Notification to Blocked.
- Optional: to stop other sites from asking, go back to Site permissions, tap Notification, and choose Blocked.
If unwanted pages or redirects keep appearing, clear Firefox’s storage (last resort):
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Open the “Settings” menu.
Tap on the “Settings” app from your phone menu or home screen.
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Tap on “Apps”.
When the “Settings” menu opens, tap on “Apps” to see all the installed applications on your phone.
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Find and tap on Firefox.
The “Apps” screen will be displayed with a list of all the apps installed on your phone. Scroll through the list until you find the Firefox app, then tap on it to open the app’s details.
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Tap “Storage”.
When Firefox’s app info menu is displayed, tap on “Storage” (on Pixel phones, “Storage & cache“).
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Tap “Clear storage” or “Clear data”.
Tap “Clear storage” (called “Clear data” on Samsung phones). If you see “Manage space” or “Manage storage” instead, tap it, then tap “Clear all data“. Don’t use “Clear cache” for this step, because it doesn’t reset the browser.
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Confirm by tapping “OK”.
A confirmation dialog will appear. Tap “OK” or “Delete” to finish. When you open Firefox again, sign back in and turn sync back on if you use it.
Remove malware from the Opera browser
First, block the spam site’s notifications:
- Open Opera, open the Opera menu, and tap Settings.
- Tap Site settings, then tap Notifications.
- Find the spam site and block it. Don’t just remove it from the list, because a removed site can ask again.
If unwanted pages or redirects keep appearing, clear Opera’s storage (last resort):
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Open the “Settings” menu.
Tap on the “Settings” app from your phone menu or home screen.
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Tap on “Apps”.
When the “Settings” menu opens, tap on “Apps” to see all the installed applications on your phone.
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Find and tap on Opera.
The “Apps” screen will be displayed with a list of all the apps installed on your phone. Scroll through the list until you find the Opera app, then tap on it to open the app’s details.
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Tap “Storage”.
When Opera’s app info menu is displayed, tap on “Storage” (on Pixel phones, “Storage & cache“).
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Tap “Clear storage” or “Clear data”.
Tap “Clear storage” (called “Clear data” on Samsung phones). If you see “Manage space” or “Manage storage” instead, tap it, then tap “Clear all data“. Don’t use “Clear cache” for this step, because it doesn’t reset the browser.
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Confirm by tapping “OK”.
A confirmation dialog will appear. Tap “OK” or “Delete” to finish. When you open Opera again, sign back in and turn sync back on if you use it.
Remove malware from Samsung Internet
First, block the spam site’s notifications:
- Open your phone’s Settings app and tap Notifications.
- Tap App notifications, then tap Samsung Internet.
- Under Sites, turn off the switch for the spam website.
If unwanted pages or redirects keep appearing, clear Samsung Internet’s storage (last resort):
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Open the “Settings” menu.
Tap on the “Settings” app from your phone menu or home screen.
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Tap on “Apps”.
When the “Settings” menu opens, tap on “Apps” to see all the installed applications on your phone.
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Find and tap on Samsung Internet.
The “Apps” screen will be displayed with a list of all the apps installed on your phone. Scroll through the list until you find the Samsung Internet app, then tap on it to open the app’s details.
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Tap “Storage”.
When Samsung Internet’s app info menu is displayed, tap on “Storage” (on Pixel phones, “Storage & cache“).
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Tap “Clear storage” or “Clear data”.
Tap “Clear storage” (called “Clear data” on Samsung phones). If you see “Manage space” or “Manage storage” instead, tap it, then tap “Clear all data“. Don’t use “Clear cache” for this step, because it doesn’t reset the browser.
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Confirm by tapping “OK”.
A confirmation dialog will appear. Tap “OK” or “Delete” to finish. When you open Samsung Internet again, sign back in and turn sync back on if you use it.
Remove malware from Microsoft Edge for Android
First, block the spam site’s notifications:
- Open Microsoft Edge, tap the menu button (three dots) at the bottom of the screen, and tap Settings.
- Tap Site permissions, then tap Notifications. In some versions, Site permissions is inside Privacy and security.
- Find the spam site in the list of allowed sites and switch it to Block.
If unwanted pages or redirects keep appearing, clear Microsoft Edge’s storage (last resort):
-
Open the “Settings” menu.
Tap on the “Settings” app from your phone menu or home screen.
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Tap on “Apps”.
When the “Settings” menu opens, tap on “Apps” to see all the installed applications on your phone.
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Find and tap on Microsoft Edge.
The “Apps” screen will be displayed with a list of all the apps installed on your phone. Scroll through the list until you find the Microsoft Edge app, then tap on it to open the app’s details.
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Tap “Storage”.
When the Microsoft Edge’s app info menu is displayed, tap on “Storage” (on Pixel phones, “Storage & cache“).
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Tap “Clear storage” or “Clear data”.
Tap “Clear storage” (called “Clear data” on Samsung phones). If you see “Manage space” or “Manage storage” instead, tap it, then tap “Clear all data“. Don’t use “Clear cache” for this step, because it doesn’t reset the browser.
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Confirm by tapping “OK”.
A confirmation dialog will appear. Tap “OK” or “Delete” to finish. When you open Microsoft Edge again, sign back in and turn sync back on if you use it.
STEP 3: Use Malwarebytes for Android to remove malicious apps
In this final step, we will install Malwarebytes for Android to scan and remove malicious apps from your phone or tablet.
Malwarebytes for Android scans your phone or tablet for malware, adware, and potentially unwanted apps. The free version scans only when you start a scan. Real-time protection, which checks apps automatically, is part of the paid Premium version.
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Download Malwarebytes for Android.
You can download Malwarebytes for Android by clicking the link below.
Get Malwarebytes for AndroidOpens Google Play in a new tab.Want real-time protection? See Malwarebytes Premium for AndroidMalwarebytes for AndroidScans your phone and removes malware at no cost -
Install Malwarebytes for Android on your phone.
In the Google Play Store, tap “Install” to install Malwarebytes for Android on your device.
When the installation process has finished, tap “Open” to begin using Malwarebytes for Android. You can also open Malwarebytes by tapping on its icon in your phone menu or home screen.
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Follow the on-screen prompts to complete the setup process
When Malwarebytes opens, it walks you through a short setup. Tap Get started and follow the prompts. If you see an offer for a trial or a paid plan, read it before you accept. You can skip it and keep using the free scanner.
Malwarebytes will ask for permission to access the files on your phone so it can scan them. Tap Allow, or turn on the permission in the Android screen that opens, then return to Malwarebytes.
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Run a scan with Malwarebytes for Android
On the main screen, tap Scan now. In some versions, you open the menu, tap Scanner, and then tap Run a scan.
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Wait for the Malwarebytes scan to complete.
Malwarebytes will now start scanning your phone for adware and other malicious apps. This process can take a few minutes, so we suggest you do something else and periodically check on the status of the scan to see when it is finished.
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Remove the detected apps.
When the scan has been completed, you will see a list of the threats that Malwarebytes for Android has detected. Next to each detected item, tap the menu icon (three dots), then choose to uninstall the app or delete the file. Android then asks you to confirm. Tap OK or Uninstall to remove the app.
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Restart your phone.
When the detected apps are removed, restart your phone if Malwarebytes asks you to. Then check whether the problems you noticed have stopped.
When you’ve finished these steps, check whether the problems you noticed have stopped. If they continue, see the options below.
If you are still having problems with your phone after completing these instructions, then please follow one of the steps:
- Ask for help in our Mobile Malware Removal Help & Support forum.
- Only as a last resort, reset your phone to factory settings. Read the warning below first.
- Back up your photos, videos, files, and messages, for example to your Google account or a computer.
- Make sure you know your Google account email and password. The phone asks for them after the reset. If you changed the password recently, Google recommends waiting 24 hours before you reset.
- On a Samsung phone, also make sure you know your Samsung account password.
- If you use an authenticator app for two-step verification, move your accounts to another device or save your backup codes first.
Remove Unwanted Apps and Malware from iPhone and iPad
STEP 1: Clean your browser
First, we’ll clean Safari using the built-in “Clear History and Website Data” feature. This removes your browsing history, cookies, and cached data — including the stored data that scam sites use to keep showing you pop-ups and redirects. Don’t worry: this won’t delete your photos, apps, or saved passwords, but it will sign you out of websites. To keep other sites signed in, you can remove only the scam site’s data instead: go to Settings > Apps > Safari > Advanced > Website Data, swipe left on the site, and tap Delete.
- Don’t tap anything inside the scam page or pop-up — the buttons are designed to trick you. Instead, tap the tabs icon in the lower-right corner of Safari, as shown below.
- Tap the X on the malicious tab (or swipe it up) to close it safely.
- Open the Settings app.
- Turn on Airplane Mode. This temporarily disconnects your iPhone from the internet, so the scam site can’t load anything while we clean up. We’ll turn it back off at the end.
- Scroll down and tap Apps, then tap Safari. On iOS 17 and earlier, Safari is listed directly in Settings.
- Tap Clear History and Website Data.
- If you’re asked to choose a timeframe, choose All history, then tap Clear History. On older iOS versions, tap “Clear History and Data” in the pop-up.
- While you’re still in Safari settings, turn on Block Pop-ups and Fraudulent Website Warning. These two switches stop most scam pages before they can even load.
- Tap Settings in the upper-left corner to return to the main Settings menu.
- Turn Airplane Mode back off to reconnect your iPhone to the internet.
STEP 2: Delete unwanted apps
Next, we’ll remove any suspicious apps from your iPhone. If a shady website redirected you to the App Store and you installed an app — or you spot an app you don’t remember downloading — delete it now:
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On the home screen, tap and hold the unwanted app’s icon until the icons start to wiggle.
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Tap the minus (–) badge in the corner of the app icon, then tap Delete App. (On older iOS versions, this badge appears as an “X”.)
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Confirm by tapping “Delete“.
Now reopen Safari and check whether the pop-ups have stopped.
To stop these scam pages from coming back, we recommend installing an ad blocker like AdGuard. It blocks the malicious ads and redirects that cause these pop-ups in the first place.
Still having issues after completing these steps? Try one of the following:
- Run a scan with Malwarebytes for iOS
- Ask for help in our free Mobile Malware Removal Help & Support forum — our team will assist you personally.
When you’ve finished these steps, check whether the pop-ups or other problems have stopped.
Frequently Asked Questions About the Fake “Windows Defender Security Warning” Pop-Up Scam
The “Windows Defender Security Warning” is a deceptive tech support scam impacting Windows users worldwide. If you see this fake pop-up on your computer, you likely have some questions about what it means and how to react. This FAQ guide will provide the key details you need to understand this fraudulent scam.
What exactly is the “Windows Defender Security Warning” scam?
The “Windows Defender Security Warning” scam starts with a fake pop-up alert pretending to be from Microsoft stating that malware or spyware was detected on your system by the Windows Firewall. The pop-up claims your data is at risk and provides a phone number to call for removal of the supposed infection. However, the number actually routes to a fraudulent call center in order to steal your personal information and money.
Why am I seeing this “Windows Defender Security Warning” pop-up suddenly appear on my PC?
Cybercriminals use various tricks to redirect users to the fake pop-up page, including poisoned ads, compromised sites, spam emails, and malware. You are likely seeing it because a criminal scheme led your browser to the fraudulent page in order to scare you into calling the number.
Is the “Windows Defender Security Warning” browser pop-up a warning from my Windows Firewall?
No, this scam pop-up has nothing to do with real alerts from Microsoft or your Windows Firewall. Microsoft will never disable your computer or force you to call a number in this manner. The pop-up is completely fake/fraudulent.
What happens if I call the tech support number listed?
The number routes to a scam call center where criminals posing as Microsoft techs will falsely claim your system is infected. They will trick you into paying for useless services, give them remote access, or hand over personal info to “fix” the imaginary infection. Their goal is identity/financial theft.
Should I provide remote access if they say my computer is at risk?
Absolutely not. Granting remote access gives scammers full control to install malware, steal data, and cause harm. Legitimate help from Microsoft does not require remote access. If an unsolicited pop-up appears, it is a scam attempt.
How can I close the “Windows Defender Security Warning” pop-up and regain access to my PC?
Force quit the web browser using the task manager. Run a real antivirus scan to show no infection exists. Reset your browser and run anti-malware tools to remove unwanted programs causing it. Never call the number listed on fake pop-ups.
I already called the number and paid money. What next steps should I take?
If you paid money or provided personal information, contact your bank immediately to halt payments. Change online account passwords, scan your device for malware, and monitor financial accounts closely for fraud. Report the scam to authorities to aid investigations and prevent harm to others.
How can I avoid the “Windows Defender Security Warning” tech support scam moving forward?
Use caution with unsolicited warnings demanding you call tech support or allow remote access. Verify the authenticity of any number directly through Microsoft before calling. Keep your operating system and security software updated. Use ad/malware blocking tools. Never trust urgent pop-ups claiming your system is compromised.
The Bottom Line
The fake “Windows Defender Security Warning” is a tech support scam employing deceptive pop-up warnings to steal money and information from unsuspecting computer users. Maintaining vigilance and verifying the legitimacy of warnings and calls can help you steer clear of this fraudulent scam. Spread awareness to help others avoid becoming victims as well.
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