How to remove 'Your OS High Sierra Is Infected With (3) Viruses!' from Mac?
- Check For Malware Free
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- How To Check Mac Sierra For Malware Protection
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What is 'Your OS High Sierra Is Infected With (3) Viruses!'?
Fake virus alert messages such as 'Your OS High Sierra Is Infected With (3) Viruses!' usually appear only on untrustworthy, deceptive websites. Most users arrive at these websites unintentionally - they are redirected to them by potentially unwanted applications (PUAs). Typically, these apps infiltrate systems without users' consent. Once installed, they cause redirects to other untrustworthy websites [similar to the one that displays the 'Your OS High Sierra Is Infected With (3) Viruses!' fake message]. PUAs also deliver ads and collect data.
According to the 'Your OS High Sierra Is Infected With (3) Viruses!' error, your Mac computer is infected with three viruses (this number can vary). In this case, the message states that a 'security check' found two malware infections and one spyware/phishing program, and that immediate removal is required, otherwise you might lose your apps, photos, and other files, and put banking and other personal information at risk. The people behind these fake messages are usually scammers who trick people into downloading (and purchasing) software, paying money for their services, and so on. At time of research, scammers were promoting the Mac Cleanup Pro application that can supposedly fix all of the issues indicated, remove viruses, and so on. Once installed, the Mac Cleanup Pro tool will find even more issues than the 'initial scan' (security check found two malware infections and one spyware/phishing program). In any case, to use this application, you will have to pay for it. We do not recommend that you purchase this app or use it. The best solution is simply to ignore the 'Your OS High Sierra Is Infected With (3) Viruses!' fake virus alert message. Close the deceptive website that displays it and do not visit it again. If you cannot close it normally, close the entire browser using Activity Monitor or simply restart your computer. Do not restore the previously closed session, since this will opens the same deceptive website that originally displayed this fake message, or another dubious site.
Unwanted applications deliver ads and gather data. PUAs deliver banners, coupons, surveys and other similar ads that are displayed via tools that enable placement of third party graphical content on any site. These can be very annoying since, when displayed, they conceal underlying content of any visited website. Furthermore, they often lead to untrustworthy websites or run scripts designed to download unwanted applications. These unwanted apps are often categorized as information tracking apps. PUAs collect browsing-related data such as IP addresses, keystrokes, search queries, URLs of visited websites, etc. They also collect personal and sensitive details. Developers of these apps share the collected data with third parties (perhaps cyber criminals) who misuse it to generate revenue. Installed PUAs can thus lead to problems relating to privacy, and browsing safety. Some users might be forced having their identities stolen.
Name | 'Your OS High Siera Is Infected With (3) Viruses!' virus |
Threat Type | Mac malware, Mac virus |
Symptoms | Your Mac became slower than normal, you see unwanted pop-up ads, you get redirected to shady websites. |
Distribution methods | Deceptive pop-up ads, free software installers (bundling), fake flash player installers, torrent file downloads. |
Damage | Internet browsing tracking (potential privacy issues), displaying of unwanted ads, redirects to shady websites, loss of private information. |
Malware Removal (Mac) | To eliminate possible malware infections, scan your Mac with legitimate antivirus software. Our security researchers recommend using Combo Cleaner. ▼ Download Combo Cleaner for Mac To use full-featured product, you have to purchase a license for Combo Cleaner. Limited three days free trial available. |
Scammers use a number of fake messages - usually fake virus alerts, fake errors, and so on. All are displayed on untrustworthy websites. Examples of similar fake messages are Your Computer Was Locked, Mac OS Support Alert, Spyware Were Found On Your Mac, and Error FXX000. These fake messages often trick people into purchasing unnecessary products or paying for services provided by scammers who claim to be 'official technicians'. All potentially unwanted applications are very similar. Developers promote them as useful tools, however, they are used to trick people into downloading unwanted apps. Generally, PUAs provide none of the functionality promised. They generate revenue for their developers and often cause various problems.
How did potentially unwanted applications install on my computer?
Potentially unwanted apps can sometimes be downloaded from their official websites, however, most users install them through intrusive advertisements or when software developers use the so-called 'bundling' method. Bundling is a deceptive marketing method used to install unwanted applications with regular software. Users are often tricked into installing them, since information regarding their presence in set-ups is not properly disclosed. Unwanted applications are usually hidden in 'Custom', 'Advanced' and other similar parts of the installation processes. Careless behaviour (skipping installation steps) often usually leads to unintentional installations of PUAs. Clicking intrusive ads without understanding the possible consequences might also cause inadvertent installations.
How to avoid installation of potentially unwanted applications?
Download software from official, trustworthy sources, and using direct links only. Avoid using third party software downloaders/installers, torrents or other similar sources. Do not finish any installation without checking the available 'Advanced'/Custom' and other sections/settings. Opt-out of any unwanted offers to install additional software, and only then finish the installation. Untrustworthy ads may seem legitimate, however, once clicked, they often redirect users to untrustworthy websites (gambling, pornography, adult dating, etc.). If you encounter these ads, check for unknown/unwanted plug-ins, add-ons, and extensions installed on your browser. Also look for unwanted programs installed on your computer. Remove unwanted entries immediately. If your computer is already infected with PUAs, we recommend running a scan with Combo Cleaner Antivirus for macOS to automatically eliminate them.
Text presented in 'Your OS High Sierra Is Infected With (3) Viruses!' scam website:
Your OS High Sierra is infected with (3) viruses!
Your OS High Sierra 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 OS High Sierra with.
Personal and banking information are at risk.
To avoid more damage click on 'Scan Now' immediately. Our deep scan will provide help immediately!
4 minutes and seconds 54 remaining before damage is permanent.
Your OS High Sierra 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 OS High Sierra with.
Personal and banking information are at risk.
To avoid more damage click on 'Scan Now' immediately. Our deep scan will provide help immediately!
4 minutes and seconds 54 remaining before damage is permanent.
Appearance of 'Your OS High Sierra Is Infected With (3) Viruses!' scam (GIF):
Screenshot of the installer of app (Mac Cleanup Pro) promoted by scammers:
Screenshot of the app (Mac Cleanup Pro) promoted by scammers:
Instant automatic Mac malware removal: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 Mac malware. Download it by clicking the button below:
▼ DOWNLOAD Combo Cleaner for MacBy downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. To use full-featured product, you have to purchase a license for Combo Cleaner. Limited three days free trial available.
▼ DOWNLOAD Combo Cleaner for MacBy downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. To use full-featured product, you have to purchase a license for Combo Cleaner. Limited three days free trial available.
Quick menu:
- STEP 1. Remove PUA related files and folders from OSX.
- STEP 2. Remove rogue extensions from Safari.
- STEP 3. Remove rogue add-ons from Google Chrome.
- STEP 4. Remove potentially unwanted plug-ins from Mozilla Firefox.
Video showing how to remove potentially unwanted apps distributed by 'Your OS High Sierra is infected with 3 viruses':
Potentially unwanted applications removal:
Remove potentially unwanted applications from your '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.
Combo Cleaner checks if your computer is infected with malware. To use full-featured product, you have to purchase a license for Combo Cleaner. Limited three days free trial available.
Remove 'your os high siera is infected with (3) viruses!' virus related files and folders:
Click the Finder icon, from the menu bar. Choose Go, and click Go to Folder...
Check for adware-generated files in the /Library/LaunchAgents folder:
In the Go to Folder... bar, type: /Library/LaunchAgents
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.
Check for adware generated files in the /Library/Application Support folder:
In the Go to Folder... bar, type: /Library/Application Support
In the “Application Support” folder, look for any recently-added suspicious folders. For example, “MplayerX” or “NicePlayer”, and move these folders to the Trash.
Check for adware-generated files in the ~/Library/LaunchAgents folder:
In the Go to Folder bar, type: ~/Library/LaunchAgents
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.
Check for adware-generated files in the /Library/LaunchDaemons folder:
In the Go to Folder... bar, type: /Library/LaunchDaemons
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.
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.
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.
After removing files and folders generated by the adware, continue to remove rogue extensions from your Internet browsers.
'Your OS High Siera Is Infected With (3) Viruses!' virus removal from Internet browsers:
Remove malicious extensions from Safari:
Remove 'your os high siera is infected with (3) viruses!' virus related Safari extensions:
Open Safari browser, from the menu bar, select 'Safari' and click 'Preferences...'.
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.
Remove malicious plug-ins from Mozilla Firefox:
Remove 'your os high siera is infected with (3) viruses!' virus related 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'.
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.
![How To Check Mac Sierra For Malware How To Check Mac Sierra For Malware](/uploads/1/2/6/5/126524899/783971595.png)
- If you continue to have problems with browser redirects and unwanted advertisements - Reset Mozilla Firefox.
Remove malicious extensions from Google Chrome:
Remove 'your os high siera is infected with (3) viruses!' virus related Google Chrome add-ons:
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'.
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.
Recently, I noticed that unwanted ads were popping up on my iMac telling me there was malware on my computer and that I needed to deal with the problem. Since the application CleanMyMac showed that my iMac was “clean,” I decided to check things out manually.
You can, too. Here’s how:
First, open the Finder and type Shift+command+G. A pop-up box dubbed “Go to Folder” will appear.
Then, type the following three commands respectively:
Check For Malware Free
How To Check Mac Sierra For Malware Safe
Click “Go” and check whether there is any weird looking plists or ones with with garbled/random file name. If you find some, delete ‘em and restart your Mac. Removing all plists with adobe in the name fixed my problem.
How To Check Mac Sierra For Malware Windows 7
By the way, a plist file is a settings file, also known as a “properties file,” used by macOS applications. It contains properties and configuration settings for various programs.
How To Detect Malware On A Mac
By the way, part II: Malwarebytes is a malware/adware protection utility and CleanMyMac is an all-in-one macOS solution designed to keep your Mac clean and to secure space from your computer’s hard drive.
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How To Check Mac Sierra For Malware Protection
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