This Mac Computer Is BLOCKED POP-UP Scam (Mac)

Also Known As: "This Mac computer is BLOCKED" virus
Type: Mac Virus
Distribution: Low
Damage level: Medium

How to remove This Mac computer is BLOCKED from Mac?

What is This Mac computer is BLOCKED?

"This Mac computer is BLOCKED" is just one of many fake messages (virus alerts, errors, warnings, etc.) that appear on untrustworthy websites. Note that users do not often visit these websites intentionally - they are redirected to them by potentially unwanted applications (PUAs) that are installed inadvertently. PUAs cause redirects to untrustworthy websites (such as those that display fake messages), collect data, and deliver ads.

This Mac computer is BLOCKED scam

When arriving at this untrustworthy website, it displays a fake virus alert message, supposedly sent by Apple. It states that the affected Mac computer's registration key is blocked for one or more of the following reasons: the registration key is illegal; there is some illegal software installed on the Mac; the computer is proliferating viruses; or; it has been hacked and being used from an undefined location. The scammers claim that the computer is blocked for your safety, and to prevent data theft or other possible problems, you must contact Apple 'security support' via the the telephone number provided ("1-855-634-6777", supposedly toll free). Note that Apple has nothing to do with this scam and the number will not connect you with Apple support. These warnings and alerts of illegal registry keys and viruses are simply attempts to trick users into paying the scammers by purchasing products or services that will supposedly activate your computer or resolve other problems. In this situation, you should simply ignore the message. Close the website that caused this fake message and do not return to it. If you cannot close it, use Activity Monitor to terminate the entire browser process, or restart your computer. Do not restore the previous session when you reopen your browser, since this will also reopen the deceptive website/s that originally caused the issue.

Potentially unwanted applications often lead users to websites on which these fake messages are displayed. PUAs also deliver rogue advertisements, such as coupons, banners, surveys, and so on. Clicking them can result in redirects to untrustworthy sites, or some might execute scripts designed to download other PUAs. Furthermore, most of these ads are displayed through tools that enable placement of third party graphical content on any site and conceal underlying content. Some PUAs collect data such as IP addresses, search queries, URLs of visited websites, geo-locations, keystrokes, and so on. This information might contain personal or sensitive details that are shared with third parties (potentially, cyber criminals) who misuse private data to generate revenue. These data tracking apps often cause privacy issues, browsing safety problems, or even identity theft.

Threat Summary:
Name"This Mac computer is BLOCKED" 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 This Mac computer is BLOCKED 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.

Apple Support Alert POP-UP, VIRUS ALERT FROM APPLE POP-UP, Your Mac Might Be Infected! are just some of the many similar scams prevalent online. Most these fake messages attempt to trick users into paying for services or products that supposedly help to resolve system problems. PUAs are similar and, typically, are promoted as offering 'useful' tools or features. In this way, many users are tricked into downloading and installing them. Note, however, that PUAs provide none of the functionality promised and only cause problems.

How did potentially unwanted applications install on my computer?

Potentially unwanted applications can be downloaded from their official websites, however, they more commonly infiltrate systems without direct permission. Software developers proliferate them using intrusive ads and a deceptive marketing method called "bundling" - stealth installation of unwanted applications with regular software. Developers are not honest enough to disclose information about installation of potentially unwanted apps, and thus most are concealed within "Custom", "Advanced" and other similar settings of the download/installation processes. Furthermore, many users click various ads and skip download or installation steps. This behaviour leads to inadvertent installation of potentially unwanted apps.

How to avoid installation of potentially unwanted applications?

Users are responsible for their online and computer safety. To avoid PUA installations, carefully analyze each step of the download/installation processes (check the "Advanced", "Custom", and other similar settings) and decline offers to download or install additional (bundled) applications. You are advised to use official and trustworthy sources when downloading software. Avoid using third party downloaders, since developers monetize them by promoting rogue software. Do not use unofficial websites (or other untrustworthy sources). If you encounter ads that redirect you to untrustworthy websites (such as pornography, gambling, adult dating, and so on), check installed extensions, add-ons, and plug-ins on your browsers, and programs on your computer. Remove all unwanted/unknown extensions and programs 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 "This Mac computer is BLOCKED" scam:

VIRUS ALERT FROM APPLE

This Mac computer is BLOCKED

 

Do not close this warning or restart your Mac
Your Mac's registration key is Blocked.
Why we blocked your Mac Computer?
The Mac's registration key is illegal.
This Mac is using pirated software.
This Mac is sending virus over the internet.
This Mac is hacked or used from undefined location.
We block this Mac for your security.
Contact Apple helpline to reactivate your Mac.

 

Apple Security Tollfree: 1-855-634-6777

Appearance of "This Mac computer is BLOCKED" scam (GIF):

Appearance of This Mac computer is BLOCKED scam (GIF)

Another variant of "This Mac computer is BLOCKED" tech support pop-up scam:

this mac is blocked scam pop-up variant 2

Text presented in this variant:

VIRUS ALERT FROM APPLE
This Mac computer is BLOCKED

Do not close this warning or restart your Mac
Your Mac's registration key is Blocked.
Why we blocked your Mac Computer?
The Mac's registration key is illegal.
This Mac is using pirated software.
This Mac is sending virus over the internet.
This Mac is hacked or used from undefined location.
We block this Mac for your security.
Contact Apple helpline to reactivate your Mac.
 
Apple Support Alert
Your System Detected Some Unusual Activity.
It might harm your Mac's data and track your financial activities.
Please report this activity to +1-877-290-1999

Instant automatic removal of This Mac computer is BLOCKED 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 This Mac computer is BLOCKED 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 eliminate "This Mac Computer Is BLOCKED" fake error using Combo Cleaner:

Potentially unwanted applications removal:

Remove potentially unwanted applications from your "Applications" folder:

mac adware removal from applications folder

Click the Finder icon. In the Finder window, select ìApplicationsî. In the applications folder, look for ìMPlayerXî,ìNicePlayerî, 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 "this mac computer is blocked" 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.

"This Mac computer is BLOCKED" virus removal from Internet browsers:

safari browser iconRemove malicious extensions from Safari:

Remove "this mac computer is blocked" 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 "this mac computer is blocked" 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 "this mac computer is blocked" 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.

About the author:

Tomas Meskauskas

Tomas Meskauskas - expert security researcher, professional malware analyst.

I am passionate about computer security and technology. I have an experience of over 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an author and editor for pcrisk.com since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats. Contact Tomas Meskauskas.

PCrisk security portal is brought by a company RCS LT. Joined forces of security researchers help educate computer users about the latest online security threats. More information about the company RCS LT.

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Removal Instructions in other languages
Malware activity

Global malware activity level today:

Medium threat activity

Increased attack rate of infections detected within the last 24 hours.

QR Code
This Mac computer is BLOCKED virus QR code
A QR code (Quick Response Code) is a machine-readable code which stores URLs and other information. This code can be read using a camera on a smartphone or a tablet. Scan this QR code to have an easy access removal guide of "This Mac computer is BLOCKED" virus on your mobile device.
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Platform: macOS

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Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Combo Cleaner.