The “Your OS Sierra is infected with (3) viruses” pop-ups are a social engineering attack that puts your browser on full screen and display pop-up messages that won’t go away, essentially locking your browser. These fake error messages aim to trick you into calling an indicated technical support hotline. If you call these scammers, they can offer fake solutions for your “problems” and ask for payment in the form of a one-time fee or subscription to a purported support service.
Apple does not send unsolicited email messages or make unsolicited phone calls to request personal or financial information or fix your device. Treat all unsolicited phone calls or pop-ups with skepticism. Do not provide any personal information.
Your browser may be redirected to the sites that display the “Your OS Sierra is infected with (3) viruses” fake error messages either by malicious advertisements on the sites you visit or adware. This guide was written to help macOS users remove malware from their devices, if your just looking for a way to block the “Your OS Sierra is infected with (3) viruses” redirect on a specific site, then 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.
The “Your OS Sierra is infected with (3) viruses” fake error messages is shown in such a way as to trick the user into thinking their device has crashed or that a virus has been detected. It does this to try and scare the infected user into calling one of the listed numbers in order to receive support. In reality, though, they will only be greeted with people who are trying to sell them unneeded support contracts and services.
The “Your OS Sierra is infected with (3) viruses” fake error messages will have this message:
Your OS Sierra is infected with (3) viruses. Spyware must be removed and system damage repaired.It is necessary to Call Apple Support 1-833-451-6111 and follow Virus removal procedure immediately, please proceed.
**If you leave this site your Mac OS will remain damaged and vulnerable**
Call Apple Help Desk Immediately at 1-833-451-6111
The following data will be compromised if you continue:
2. Browser History
3. Credit Card Information
This virus is well known for complete identity and credit card theft. Further action through this computer or any computer on the network will reveal private information and involve serious risks.
Call Apple Help Desk Immediately at 1-833-451-6111
The scammer will typically attempt to get the victim to allow remote access to their device. After remote access is gained, the scammer relies on confidence tricks typically involving utilities built into Windows and other software in order to gain the victim’s trust to pay for the supposed “support” services, when the scammer actually steals the victim’s credit card account information.
How To Remove “Your OS Sierra is infected with (3) viruses” Pop-up Scam (Mac Guide)
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 Your OS Sierra is infected with (3) viruses Pop-up Scam, follow these steps:
- STEP 1: Remove the malicious apps from Mac
- STEP 2: Uninstall malicious extensions from Safari, Chrome, or Firefox
- STEP 3: Use Malwarebytes for Mac to remove “Your OS Sierra is infected with (3) viruses” adware
This step is needed if the site which is showing the “Your OS Sierra is infected with (3) viruses” pop-up will not allow you to close your browser.
- On your keyboard, press the Command + Option + Escape keys simultaneously. This will open the “Force Quit” application window.
- In the “Force Quit”, click on Safari, Chrome, Firefox or any other browser in which your are seeing the “Your OS Sierra is infected with (3) viruses” pop-up.
- Click the button that says “Force Quit“. This will forcefully end your browser, thus closing the “Your OS Sierra is infected with (3) viruses” 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.
Click the Finder application on your dock.
Click on “Applications”
In the Finder left pane, click on “Applications“.
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”.
Known malicious apps: WeKnow, MacSaver, MacVX (and variants like MacVaX), MacCaptain, MacPriceCut, SaveOnMac, Mac Global Deals or MacDeals, MacSter, MacXcoupon, Shop Brain (or variants like SShoP Braaiin), PalMall, MacShop, MacSmart, News Ticker Remover, Shopper Helper Pro, Photo Zoom, Best YouTube Downloader, ArcadeYum, Extended protection, Video download helper, FlashFree or GoldenBoy.
The malicious app may have a different name on your device. If you cannot find any malicious apps, you can proceed with the next step
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.
Next, click the desktop to make sure you’re in the Finder, choose Go > Go to Folder, type in /Users/Shared/. In the Shared folder, delete the Slimi files and folders.
STEP 2: Uninstall the malicious extensions from Safari, Chrome, or Firefox
Go to Safari’s “Preferences”.
On the menu bar, click the “Safari” menu and select “Preferences”.
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 its a web page you want to use as your start-up page.
Next, click on the “Extensions” tab.
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.
Known malicious extensions: WeKnow, MacSaver, MacVX (and variants like MacVaX), MacCaptain, MacPriceCut, SaveOnMac, Mac Global Deals or MacDeals, MacSter, MacXcoupon, Shop Brain (or variants like SShoP Braaiin), PalMall, MacShop, MacSmart, News Ticker Remover, Shopper Helper Pro, Photo Zoom, Best YouTube Downloader, ArcadeYum, Extended protection, Video download helper, FlashFree or GoldenBoy.
The malicious extension may have a different name on your device. If you cannot find any malicious extension, you can proceed with the next step.
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.
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“.
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).
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.
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.
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.
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.
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.
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 “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.
Click on “Refresh Firefox”
Click the “Refresh Firefox” button in the upper-right corner of the “Troubleshooting Information” page.
To continue, click on the “Refresh Firefox” button in the new confirmation window that opens.
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 3: Use Malwarebytes for Mac to remove “Your OS Sierra is infected with (3) viruses” 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.
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)
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.
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.
Next, click on “Install“.
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.
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.
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 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 “Your OS Sierra is infected with (3) viruses” pop-ups should now be removed from your device. If you are still experiencing problems while trying to remove the Your OS Sierra is infected with (3) viruses pop-ups from your Mac, please ask for help in our Malware Removal Assistance for Mac forum.