How To Remove “WARNING! MAC OS Is Infected” Tech Support Scam

The “WARNING! MAC OS Is Infected” pop-ups are a browser-based scam that displays fake error messages to trick you into installing malicious programs on your computer. What is WARNING! MAC OS Is Infected? The “WARNING! MAC OS Is Infected” pop-up …

The “WARNING! MAC OS Is Infected” pop-ups are a browser-based scam that displays fake error messages to trick you into installing malicious programs on your computer.

WARNING! MAC OS Is Infected Pop-up Scam virus
Image: WARNING! MAC OS Is Infected – Fake Error Messages

What is WARNING! MAC OS Is Infected?

The “WARNING! MAC OS Is Infected” pop-up is a scam that is shown in such a way as to trick you into thinking your computer has crashed or that a virus has been detected on the device. It does this to try and scare you into downloading and installing malicious programs on your computer.
The “WARNING! MAC OS Is Infected” fake error messages will display this alert:

WARNING!
MAC OS is infected with Viruses and other malicious applications. Viruses must be removed and system damage repaired. It is necessary to Call Apple Support and follow Virus removal procedure immediately, please proceed.

** If you leave this site your Mac OS will remain damaged and vulnerable **

As you can imagine, this fake error message and anything it states is just a scam to try and scare you into downloading and installing potentially unwanted programs on your computer.

Why am I seeing the WARNING! MAC OS Is Infected pop-up ads?

You are seeing the “WARNING! MAC OS Is Infected” pop-up ads because you are either infected with adware or another web site is redirecting you to them.

This guide was written to help Mac users remove malware from their devices, so if you’re just looking for a way to block the “WARNING! MAC OS Is Infected” redirect on a specific site, you can use a free browser extension like Adblock.

When it comes to adware, these malicious programs are bundled with other free software that you download off of the Internet. Unfortunately, some free downloads do not adequately disclose that other software will also be installed and you may find that you have installed adware without your knowledge.
Here are a few typical signs that you have adware on your system:

  • Advertisements appear in places they shouldn’t be.
  • Your web browser’s homepage has mysteriously changed without your permission.
  • Web pages that you typically visit are not displaying properly.
  • Website links redirect to sites different from what you expected.
  • Browser popups appear which recommend fake updates or other software.
  • Other unwanted programs might get installed without your knowledge.

You should always pay attention when installing software because often, a software installer includes optional installs. Be very careful what you agree to install.
Always opt for the custom installation and deselect anything that is not familiar, especially optional software that you never wanted to download and install in the first place. It goes without saying that you should not install software that you don’t trust.

To check your computer for adware and remove it for free, please use the guide below.

How To Remove WARNING! MAC OS Is Infected Pop-up Scam (Mac Guide)

This malware removal guide may appear overwhelming due to the number of steps and numerous programs that are being used. We have only written it this way to provide clear, detailed, and easy to understand instructions that anyone can use to remove malware for free.
Please perform all the steps in the correct order. If you have any questions or doubt at any point, STOP and ask for our assistance.

To remove WARNING! MAC OS Is Infected redirect, follow these steps:


This step is needed if the “WARNING! MAC OS Is Infected” pop-ups will not allow you to close your browser.

  1. On your keyboard, press the Command + Option + Escape keys simultaneously. This will open the “Force Quit” application window.
  2. In the “Force Quit”, click on Safari, Chrome, Firefox or any other browser in which you are seeing the WARNING! MAC OS Is Infected pop-up.
  3. Click the button that says “Force Quit“. This will forcefully end your browser, thus closing the WARNING! MAC OS Is Infected pop-up.
    If you cannot switch from the unresponsive app, press Command + Option + Shift + Esc for three seconds to force it to quit. This key combination tells macOS to force quit the front-most app. Alternatively, if you are using Safari or any other browser, you can disconnect your Internet, then open the web browser, navigate from the malicious web page, then reconnect to the Internet.

STEP 1: Remove the malicious apps from Mac

In this first step, we will try to identify and remove any malicious app that might be installed on your device.

  1. Open “Finder”

    Click the Finder application on your dock.
    Click on Finder

  2. Click on “Applications”

    In the Finder left pane, click on “Applications“.
    Click Applications macOS

  3. Find and remove the malicious app.

    The “Applications” screen will be displayed with a list of all the app installed on your device. Scroll through the list until you find the malicious app, right-click it, and then click “Move to Trash”.

    Look out for any suspicious program that could be behind all the drama – anything you don’t remember downloading or that doesn’t sound like a genuine program. Here are some known malicious programs: TakeFresh, TopResults, FeedBack, ApplicationEvents, GeneralOpen, PowerLog, MessengerNow, ImagePrime, GeneralNetSearch, Reading Cursors, GlobalTechSearch, PDFOnline-express, See Scenic Elf, MatchKnowledge, Easy Speedtest, or WebDiscover.

    The malicious program may have a different name on your computer. If you cannot find any malicious programs on your computer, you can continue with STEP 2.

    Find The Malicious App and Remove It to remove WARNING! MAC OS Is Infected pop-ups

  4. Click “Empty Trash”

    On the dock, right-click on the trash icon and select “Empty Trash”. Doing so deletes the Trash’s contents, including the program that you just sent to the Trash.
    Right-click on Trash and select Empty Trash MacOS

Some types of malware may also create a new group policy for your device before we proceed with the other steps we need to remove these unwanted changes.

  1. Go to System Preferences.
  2. Click Profiles.
  3. The list will include an item “AdminPrefs“. Select this and click the remove “” button in the lower left corner.
    If there isn’t a Profiles icon, you don’t have any profiles installed, which is normal.

STEP 2: Uninstall the malicious extensions from Safari, Chrome, or Firefox

Safari

  1. Go to Safari’s “Preferences”.

    On the menu bar, click the “Safari” menu and select “Preferences”.
    On the Menu bar Click on Safari then Preference

  2. Check Homepage.

    This will open a new window with your Safari preferences, 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.

    Change Homepage in Safari

  3. Click “Extensions”

    Next, click on the “Extensions” tab.
    Click on Extensions MacOS

  4. Find and uninstall the malicious extension.

    The “Extensions” screen will be displayed with a list of all the extensions installed on Safari. Scroll through the list until you find the malicious extension, and then click on “Uninstall” to remove it. By default, there are no extensions installed on Safari.

    Look out for any suspicious extension that could be behind all the drama – anything you don’t remember installing or that doesn’t sound like a genuine browser extension.
    Here are some known malicious extensions: TakeFresh, TopResults, FeedBack, ApplicationEvents, GeneralOpen, PowerLog, MessengerNow, ImagePrime, GeneralNetSearch, Reading Cursors, GlobalTechSearch, PDFOnline-express, See Scenic Elf, MatchKnowledge, Easy Speedtest, or WebDiscover.

    The malicious extensions may have a different name on your computer. If you cannot find any malicious programs on your browser, you can continue with STEP 3.

    Click on Uninstall to remove the WARNING! MAC OS Is Infected pop-ups

Google Chrome

Google Chrome has an option that will reset itself to its default settings. Resetting your browser settings will reset the unwanted changes caused by installing other programs. However, your saved bookmarks and passwords will not be cleared or changed.

  1. Open Chrome’s “Settings” menu.

    Click on Chrome’s main menu button, represented by three horizontal lines. When the drop-down menu appears, select the option labeled “Settings“.
    Click on the Chrome menu button then on the Settings button MacOS

  2. At the bottom, click “Advanced”.

    Chrome’s “Settings” should now be displayed in a new tab or window, depending on your configuration. Next, scroll to the bottom of the page and click on the “Advanced” link (as seen in the below example).
    Click on the Advanced button MacOS

  3. Under the section “Reset,” click “Reset”.

    Chrome’s advanced settings should now be displayed. Scroll down until the “Reset and clean up” section is visible, as shown in the example below. Next, click on the “Reset settings to their original defaults” button.
    Scroll down and click on the Reset button remove WARNING! MAC OS Is Infected pop-ups

  4. Confirm by clicking “Reset”.

    A confirmation dialog should now be displayed, detailing the components that will be restored to their default state should you continue on with the reset process. To complete the restoration process, click on the “Reset Settings” button.
    Click on Reset Settings to restore Google Chrome to its default settings MacOS

In many cases, changes to Chrome may not be fixed with a simple browser reset. In such a case, it will be easier to completely remove Chrome and all data, then reinstall. To do this, click the Finder icon, from the menu bar. Choose Go, and click Go to Folder, then paste one of the below paths into the window that opens.

You will need to delete all of the below items, but before doing this be aware that this will delete all data for all Google apps you have installed, such as your bookmarks, so you will need to export them before doing this.

/Applications/Chrome.app
/Library/Application Support/Google/
/Library/Google/
~/Library/Application Support/Google/
~/Library/Google/
~/Library/Preferences/com.google.Chrome.plist

After deleting all of the above files, restart your device. You can now download and re-install Google Chrome on your device. You will need to import any exported bookmarks or other data, and may need to reinstall any other Google apps that you use.

Mozilla Firefox

If you’re having problems with Firefox, resetting it can help. 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.

  1. Go to the “Help” menu.

    Click on Firefox’s main menu button, represented by three horizontal lines. When the drop-down menu appears, select the option labeled “Help“.
    Click on the Firefox Menu button then select Help MacOS

  2. Click “Troubleshooting Information”.

    From the Help menu, click on “Troubleshooting Information“.

    If you’re unable to access the “Help” menu, type about:support in your address bar to bring up the Troubleshooting information page.

    Troubleshooting Information option in Firefox MacOS

  3. Click on “Refresh Firefox”

    Click the “Refresh Firefox” button in the upper-right corner of the “Troubleshooting Information” page.
    Click on the Refresh Firefox button to remove WARNING! MAC OS Is Infected pop-ups

  4. Confirm.

    To continue, click on the “Refresh Firefox” button in the new confirmation window that opens.
    Click again on Refresh Firefox button macos

  5. 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“.

Your old Firefox profile will be placed on your desktop in a folder named “Old Firefox Data“. If the reset didn’t fix your problem you can restore some of the information not saved by copying files to the new profile that was created. If you don’t need this folder any longer, you should delete it as it contains sensitive information.

STEP 3: Use Malwarebytes for Mac to remove “WARNING! MAC OS Is Infected” adware

Malwarebytes is one of the most popular and most used anti-malware apps, and for good reasons. It is able to destroy many types of malware that other software tends to miss, without costing you absolutely nothing. When it comes to cleaning up an infected device, Malwarebytes has always been free and we recommend it as an essential tool in the fight against malware.

The first time you install Malwarebytes, you’re given a free 30-days trial of the premium edition, which includes preventative tools like real-time scanning and specific protection from ransomware. After 30 days, it automatically reverts to the basic free version that will detect and clean up malware infections only when you run a scan.

  1. Download Malwarebytes.

    You can download Malwarebytes by clicking the link below.

    MALWAREBYTES FOR MAC DOWNLOAD LINK
    (The above link will open a new page from where you can download Malwarebytes for Mac)
  2. Double-click on the Malwarebytes setup file.

    When Malwarebytes has finished downloading, double-click on the Malwarebytes-Mac-3.x.y.zzz.pkg file to install Malwarebytes on your device. In most cases, downloaded files are saved to the Downloads folder.
    Double-click on the Malwarebytes setup file Mac

  3. Follow the on-screen prompts to install Malwarebytes.

    When the Malwarebytes installation begins, you will see the Malwarebytes Setup Wizard which will guide you through the installation process. The setup wizard displays an introduction to Malwarebytes for Mac. Click on “Continue” to complete the installation process.

    Malwarebytes for Mac - Install

    Malwarebytes for Mac - Install Part 2

    Next, click on “Install“.

    Malwarebytes for Mac - Install Part 3

    Malwarebytes for Mac - Install Part 4

  4. Click on “Scan Now”.

    Once installed, Malwarebytes will automatically start and update the antivirus database. To perform a system scan, click on the “Scan Now” button.

    Malwarebytes scan for WARNING! MAC OS Is Infected virus

  5. Wait for the Malwarebytes scan to complete.

    Malwarebytes will now start scanning your Mac 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.
    Malwarebytes for Mac scanning for virus

  6. Click on “Confirm”.

    When the scan has completed, you will be presented with a screen showing the malware infections that Malwarebytes has detected. To remove the malicious apps that Malwarebytes has found, click on the “Confirm” button.
    Malwarebytes for Mac removing WARNING! MAC OS Is Infected
    Malwarebytes will now remove all the malicious files that it has found. To complete the malware removal process, Malwarebytes may ask you to restart your device.


The “WARNING! MAC OS Is Infected” pop-ups should now be removed from your device. If you are still experiencing problems while trying to remove the “WARNING! MAC OS Is Infected” pop-ups from your Mac, please ask for help in our Malware Removal Assistance for Mac forum.

If we have managed to help you, please share this guide to help others.

Leave a Comment