Your MacOS 10.12 Sierra Is Infected With 3 Viruses! POP-UP Scam (Mac)

Also Known As: "Your MacOS 10.12 Sierra is infected with 3 viruses!" virus
Type: Mac Virus
Distribution: Low
Damage level: Medium

How to remove "Your MacOS 10.12 Sierra is infected with 3 viruses!" from Mac?

What is "Your MacOS 10.12 Sierra is infected with 3 viruses!"?

"Your MacOS 10.12 Sierra is infected with 3 viruses!" is a scam, a fake virus alert message that appears when visiting a specific deceptive/untrustworthy website. Generally, users do not arrive at these websites willingly - installed potentially unwanted applications (PUAs) redirect them to deceptive websites, deliver intrusive ads, and gather various browsing-related and other information. Typically, users install these unwanted apps inadvertently.

Your MacOS 10.12 Sierra is infected with 3 viruses! scam

Scammers behind "Your MacOS 10.12 Sierra is infected with 3 viruses!" attempt to make users believe that their Mac computers are infected with "e.tre456_worm_osx" trojan, a malicious program. The deceptive website states that the MacOS 10.12 Sierra operating system is infected with other viruses: two malware infections and one phishing/spyware infection. Scammers claim to be Apple Support members and urge users to take immediate action. I.e., removal of the detected viruses by downloading the Mac Cleanup Pro application before a five-minute time limit elapses. They state that this tool will remove viruses and prevent system data loss. Once downloaded and installed, Mac Cleanup Pro allows users to run a 'free' scan that will detect even more issues than the deceptive website. To remove/fix these detected problems, however, users are urged to purchase a 'full version' of this software. Note that the scan results are often fake. "Your MacOS 10.12 Sierra is infected with 3 viruses!" is a typical scam used to trick people into purchasing a specific product. Note that Apple has nothing to do with this. Our advice is to simply ignore these fake virus alerts by quitting the deceptive websites that display them. If a website prevents you from closing it, use Activity Monitor and terminate the browser process. Do not reopen the last closed page or restore the previously-closed session. This will reopen the same deceptive website, or the website that redirected you to it in the first place.

As mentioned in the introduction, potentially unwanted apps cause redirects to deceptive websites on which virus alert messages such as "Your MacOS 10.12 Sierra is infected with 3 viruses!" are displayed. They also feed users with intrusive advertisements and record data relating to browsing habits (and other details). Typically, these intrusive ads are displayed using tools that enable placement of third party graphical content on any site. Coupons, banners, surveys, pop-ups, and other ads conceal underlying content of any visited website. Furthermore, clicking them often leads to untrustworthy websites or might even execute scripts designed to download/install other PUAs. Another downside is information tracking. These unwanted apps collect data such as keystrokes, search queries, IP addresses, URLs of visited websites, etc. The data often includes personal/sensitive information that PUA developers share with third parties (potentially, cyber criminals) who misuse it to generate revenue. These actions can lead to privacy issues, problems with browsing safety, and some users might even become victims of identity theft.

Threat Summary:
Name"Your MacOS 10.12 Sierra is infected with 3 viruses!" virus
Threat TypeMac malware, Mac virus
SymptomsYour Mac became slower than normal, you see unwanted pop-up ads, you get redirected to shady websites.
Distribution methodsDeceptive pop-up ads, free software installers (bundling), fake flash player installers, torrent file downloads.
DamageInternet browsing tracking (potential privacy issues), displaying of unwanted ads, redirects to shady websites, loss of private information.
Removal

To eliminate Your MacOS 10.12 Sierra is infected with 3 viruses! virus our malware researchers recommend scanning your computer with Combo Cleaner.
▼ Download Combo Cleaner
Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Combo Cleaner.

Some examples of other fake messages similar to "Your MacOS 10.12 Sierra is infected with 3 viruses!" are Your OS High Sierra Is Infected With (3) Viruses!, Spyware Were Found On Your Mac, and Error FXX000. Typically, scammers use these scams to trick people into downloading and purchasing unnecessary software or paying for technical services/assistance. They usually claim to be officials from well-known companies such as Apple, Microsoft, and so on. Most PUAs are very similar. Developers trick people into downloading and installing them by promoting 'useful' apps. Once installed, however, they provide none of the functionality promised and are designed only to generate revenue for the developers.

How did potentially unwanted applications install on my computer?

In some cases, PUAs can be downloaded from official websites, however, users often install them inadvertently via intrusive ads or when software developers use "bundling", a deceptive marketing method used to trick people into installing unwanted apps together with other software. Software developers hide unwanted apps in "Custom", "Advanced" and other similar parts of the installation/download set-ups. Information regarding the presence of bundled apps is not properly disclosed, however, inadvertent installations of these applications usually happen since many users leave settings unchanged or simply skip installation/download steps.

How to avoid installation of potentially unwanted applications?

To prevent installation of unwanted apps, download/install software carefully. Use official, trustworthy sources and direct links only. Avoid untrustworthy, unofficial websites, third party downloaders/installers, and other such tools. Check "Custom", "Advanced" and other similar settings when installing or downloading software. Deselect offers to install unwanted apps and only then finish the installation or download. Avoid clicking intrusive advertisements, especially when visiting untrustworthy websites. If you encounter ads that redirect you to gambling, adult dating, and other untrustworthy websites, check your browser for any unwanted, unknown extensions, add-ons, and plug-ins, and remove them immediately. Also check the list of installed programs installed on your operating system and uninstall any unwanted/unknown entries. If your computer is already infected with PUAs, we recommend running a scan with Combo Cleaner Antivirus for macOS to automatically eliminate them.

Appearance of "Your MacOS 10.12 Sierra is infected with 3 viruses!" scam (GIF):

Appearance of Your MacOS 10.12 Sierra is infected with 3 viruses! scam (GIF)

Text presented in a deceptive website pop-up window:

You're MacOS 10.12 Sierra is infected with 3 viruses

IMMEDIATE ACTION REQUIRED

We have detected a trojan virus (e.tre456_worm_osx) on your Mac.

Press OK to begin the repair process.

Screenshot of a deceptive website background:

sierra12-background

Text presented in a deceptive website background:

Your Mac is infected with 3 viruses. Our security check found traces of 2 malware and 1 phishing/spyware. System damage: 28.1% - Immediate removal required!

The immediate removal of the viruses is required to prevent further system damage, loss of Apps, Photos or other files. Traces of 1 phishing/spyware were found on your Mac with OSX.

To avoid more damage click on 'Scan Now' immediately. Our deep scan will provide help immediately!

4 minute and 34 seconds remaining before damage is permanent.

Start Scan

Screenshot of Mac Cleanup Pro app:

Mac Cleanup Pro unwanted application

Instant automatic removal of Your MacOS 10.12 Sierra is infected with 3 viruses! virus: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Combo Cleaner is a professional automatic malware removal tool that is recommended to get rid of Your MacOS 10.12 Sierra is infected with 3 viruses! virus. Download it by clicking the button below:
▼ DOWNLOAD Combo Cleaner for Mac By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Combo Cleaner.

Quick menu:

Video showing how to remove unwanted applications distributed by fake "Your MacOS 10.12 High Sierra is infected with 3 viruses!" pop-up scam:

Potentially unwanted applications removal:

Remove potentially unwanted applications from your "Applications" folder:

mac browser hijacker removal from applications folder

Click the Finder icon. In the Finder window, select "Applications". In the applications folder, look for "MPlayerX", "NicePlayer", or other suspicious applications and drag them to the Trash. After removing the potentially unwanted application(s) that cause online ads, scan your Mac for any remaining unwanted components.

Remove "your macos 10.12 sierra is infected with 3 viruses!" virus related files and folders:

Finder go to folder command

Click the Finder icon, from the menu bar. Choose Go, and click Go to Folder...

step1Check for adware-generated files in the /Library/LaunchAgents folder:

removing adware from launch agents folder step 1

In the Go to Folder... bar, type: /Library/LaunchAgents

removing adware from launch agents folder step 2
In the “LaunchAgents” folder, look for any recently-added suspicious files and move them to the Trash. Examples of files generated by adware - “installmac.AppRemoval.plist”, “myppes.download.plist”, “mykotlerino.ltvbit.plist”, “kuklorest.update.plist”, etc. Adware commonly installs several files with the same string.

step2Check for adware generated files in the /Library/Application Support folder:

removing adware from application support folder step 1

In the Go to Folder... bar, type: /Library/Application Support

removing adware from application support folder step 2
In the “Application Support” folder, look for any recently-added suspicious folders. For example, “MplayerX” or “NicePlayer”, and move these folders to the Trash.

step3Check for adware-generated files in the ~/Library/LaunchAgents folder:

removing adware from ~launch agents folder step 1


In the Go to Folder bar, type: ~/Library/LaunchAgents

removing adware from ~launch agents folder step 2

In the “LaunchAgents” folder, look for any recently-added suspicious files and move them to the Trash. Examples of files generated by adware - “installmac.AppRemoval.plist”, “myppes.download.plist”, “mykotlerino.ltvbit.plist”, “kuklorest.update.plist”, etc. Adware commonly installs several files with the same string.

step4Check for adware-generated files in the /Library/LaunchDaemons folder:

removing adware from launch daemons folder step 1
In the Go to Folder... bar, type: /Library/LaunchDaemons

removing adware from launch daemons folder step 2
In the “LaunchDaemons” folder, look for recently-added suspicious files. For example “com.aoudad.net-preferences.plist”, “com.myppes.net-preferences.plist”, "com.kuklorest.net-preferences.plist”, “com.avickUpd.plist”, etc., and move them to the Trash.

step 5 Scan your Mac with Combo Cleaner:

If you have followed all the steps in the correct order you Mac should be clean of infections. To be sure your system is not infected run a scan with Combo Cleaner Antivirus. Download it HERE. After downloading the file double click combocleaner.dmg installer, in the opened window drag and drop Combo Cleaner icon on top of the Applications icon. Now open your launchpad and click on the Combo Cleaner icon. Wait until Combo Cleaner updates it's virus definition database and click "Start Combo Scan" button.

scan-with-combo-cleaner-1

Combo Cleaner will scan your Mac for malware infections. If the antivirus scan displays "no threats found" - this means that you can continue with the removal guide, otherwise it's recommended to remove any found infections before continuing.

scan-with-combo-cleaner-2

After removing files and folders generated by the adware, continue to remove rogue extensions from your Internet browsers.

"Your MacOS 10.12 Sierra is infected with 3 viruses!" virus removal from Internet browsers:

safari browser iconRemove malicious extensions from Safari:

Remove "your macos 10.12 sierra is infected with 3 viruses!" virus related Safari extensions:

safari browser preferences

Open Safari browser, from the menu bar, select "Safari" and click "Preferences...".

safari extensions window

In the preferences window, select "Extensions" and look for any recently-installed suspicious extensions. When located, click the "Uninstall" button next to it/them. Note that you can safely uninstall all extensions from your Safari browser - none are crucial for normal browser operation.

  • If you continue to have problems with browser redirects and unwanted advertisements - Reset Safari.

firefox browser iconRemove malicious plug-ins from Mozilla Firefox:

Remove "your macos 10.12 sierra is infected with 3 viruses!" virus related Mozilla Firefox add-ons:

accessing mozilla firefox add-ons

Open your Mozilla Firefox browser. At the top right corner of the screen, click the "Open Menu" (three horizontal lines) button. From the opened menu, choose "Add-ons".

removing malicious add-ons from mozilla firefox

Choose the "Extensions" tab and look for any recently-installed suspicious add-ons. When located, click the "Remove" button next to it/them. Note that you can safely uninstall all extensions from your Mozilla Firefox browser - none are crucial for normal browser operation.

  • If you continue to have problems with browser redirects and unwanted advertisements - Reset Mozilla Firefox.

chrome-browser-iconRemove malicious extensions from Google Chrome:

Remove "your macos 10.12 sierra is infected with 3 viruses!" virus related Google Chrome add-ons:

removing malicious google chrome extensions step 1

Open Google Chrome and click the "Chrome menu" (three horizontal lines) button located in the top-right corner of the browser window. From the drop-down menu, choose "More Tools" and select "Extensions".

removing malicious Google Chrome extensions step 2

In the "Extensions" window, look for any recently-installed suspicious add-ons. When located, click the "Trash" button next to it/them. Note that you can safely uninstall all extensions from your Google Chrome browser - none are crucial for normal browser operation.

  • If you continue to have problems with browser redirects and unwanted advertisements - Reset Google Chrome.