How to remove 'Mac OS Support Alert' from Mac?

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What is 'Mac OS Support Alert'?

Many users encounter the fake 'Mac OS Support Alert' virus alert message when visiting deceptive, untrustworthy websites. People generally arrive at these websites inadvertently - they are redirected to them by potentially unwanted applications (PUAs) that are installed without direct user permission. In addition to redirects to untrustworthy websites, PUAs record personal and browsing-related data, and deliver intrusive ads.

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According to the scammers responsible for the 'Mac OS Support Alert' fake virus alert, the user's computer/computer registration key is blocked. They claim that this happened for one of the following reasons: the OS registration key is illegal; some installed software is illegal/pirated; the computer is proliferating viruses, or; the system is hacked and used from an undefined location. As stated in the 'Mac OS Support Alert' pop-up window, the computer is blocked for the user's security. To reactivate/unlock the Mac computer, users are encouraged to contact the Apple support (helpline). The website itself contains statements suggesting that the computer is infected with three viruses that might harm stored data and track financial activities. To prevent any further damage and unblock the system, users must supposedly contact Apple security/support via the telephone number '+1-855-792-1999' provided. These statements regarding virus infections and blocked computers are simply attempts to trick people into contacting scammers and purchasing their products and services. When contacted, the scammers claim to be 'technicians' or Apple support members. They encourage users to purchase various products and services that, according to scammers, will remove viruses, unblock computers, and so on. We strongly recommend that you ignore the 'Mac OS Support Alert' virus alert. Close this website and do not open it again. If you cannot close it normally, use Activity Monitor and terminate the entire browser process. Another way to close it is to simply restart your computer. In any case, do not restore the closed session the next time you open the browser, since this will open an identical/deceptive website or the website that led you there in the first place.

Potentially unwanted applications that cause redirects to these deceptive websites also tend to deliver intrusive advertisements - coupons, banners, surveys, and other similar ads. These can be very annoying and affect the overall browsing experience, since they are usually displayed via tools that enable placement of third party graphical content on any site and conceal underlying content of visited websites. Furthermore, clicking these ads might lead to other untrustworthy websites or execute scripts that download and install other PUAs. Another negative aspect of PUAs is that they are often designed to collect browsing-related data such as IP addresses, keystrokes, search queries, URLs of visited websites, and so on. PUAs sometimes record personal/sensitive data as well. PUAs developers share the collected data with third parties (potentially, cyber criminals) who misuse it to generate revenue. Thus, having a data tracking app installed might lead to privacy/browsing safety issues or even identity theft.

There are many similar fake virus alerts and error messages online. Some examples are Spyware Were Found On Your Mac, Error FXX000, and This Mac Computer Is BLOCKED. They might differ slightly, however, the purpose of most of these scam messages is to trick people into purchasing useless software, unnecessary services, etc. All potentially unwanted applications are mostly similar - developers promote these apps as useful tools, but these are only attempts to give the impression of legitimacy and trick users into downloading/installing them.

How did potentially unwanted applications install on my computer?

Some unwanted apps have official websites, however, most people install them through intrusive advertisements or when developers use a deceptive marketing method called 'bundling'. Bundling is stealth installation of potentially unwanted applications with regular third party software that users download from the internet. Generally, PUAs are hidden in 'Advanced'/'Custom and other similar settings/options of the installation processes. Therefore, careless behaviour (such as skipped installation steps) often causes inadvertent installation of potentially unwanted applications or other problems relating to browsing safety and privacy.

How to avoid installation of potentially unwanted applications?

Avoid downloading software from untrustworthy sources, using third party downloaders, torrents, or other similar channels. Use official (and trustworthy) websites and direct links. Do not skip the software installation steps - check 'Advanced', 'Custom', 'Manual' and other similar options or settings of the installation dialogs. Deselect unwanted applications and only then finish the installation. If you encounter intrusive ads that redirect you to dubious websites (gambling, pornography, adult dating, and so on), check your browser for any unwanted extensions, add-ons, and plug-ins and uninstall them immediately. Also check the list of installed programs on your computer. 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 'Mac OS Support Alert' scam:

VIRUS ALERT FROM Apple
This computer is BLOCKED
DO not close this window and restart your computer
Your computer's registration key is Blocked
Why we blocked your computer?
This Mac OS's registration is illegal.
This Mac OS is using pirated software.
This Mac OS is sending virus over the internet.
This Mac OS is hacked or used from undefined location.
We have blocked this computer for your security.
Contact Apple helpline to reactivate your computer.

Mac is infected with (3) Viruses.
Mac OS Support Alert
Your System Detected Some Unusual Activity
It might harm your computer data and track your financial activities.
Please report this activity to +1-855-792-1999

Appearance of 'Mac OS Support Alert' scam (GIF):

Instant automatic Mac malware removal:Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Animal games for mac. 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.

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 eliminate 'Mac OS Support Alert' pop-up scam using Combo Cleaner:

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 'mac os support alert' 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/LaunchAgentsTen thousand things! mac os.

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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:

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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:

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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.

'Mac OS Support Alert' virus removal from Internet browsers:

Remove malicious extensions from Safari:

Remove 'mac os support alert' 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.

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Remove malicious plug-ins from Mozilla Firefox:

Remove 'mac os support alert' 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.

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

Remove malicious extensions from Google Chrome:

Remove 'mac os support alert' 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.

Is your Mac up to date with the latest version of the Mac operating system? Is it using the version required by a product that you want to use with your Mac? Which versions are earlier (older) or later (newer, more recent)? To find out, learn which version is installed now.

If your macOS isn't up to date, you may be able to update to a later version.

Which macOS version is installed?

From the Apple menu  in the corner of your screen, choose About This Mac. You should see the macOS name, such as macOS Big Sur, followed by its version number. If you need to know the build number as well, click the version number to see it.

Which macOS version is the latest?

These are all Mac operating systems, starting with the most recent. When a major new macOS is released, it gets a new name, such as macOS Big Sur. As updates that change the macOS version number become available, this article is updated to show the latest version of that macOS.

If your Mac is using an earlier version of any Mac operating system, you should install the latest Apple software updates, which can include important security updates and updates for the apps that are installed by macOS, such as Safari, Books, Messages, Mail, Music, Calendar, and Photos.