Critical System Error: x679Qs5m POP-UP Scam (Mac)

Also Known As: "Critical System Error: x679Qs5m" virus
Type: Mac Virus
Distribution: Low
Damage level: Medium

How to remove Critical System Error: x679Qs5m from Mac?

What is Critical System Error: x679Qs5m?

"Critical System Error: x679Qs5m" is a fake error message displayed by various malicious sites. It is very similar to iPhone Has Been Locked, Your Mac Is Infected With 3 Viruses, and many others. Research shows that most users visit these sites inadvertently - they are redirected by intrusive advertisements (delivered by other rogue websites) or potentially unwanted programs (PUPs). In most cases, potentially unwanted programs infiltrate systems without permission. As well as causing redirects, they deliver intrusive advertisements and gather sensitive information.

Critical System Error: x679Qs5m scam

This error message states that the system is infected and that users must immediately perform a full system scan by clicking the "Continue" button. Be aware, however, that "Critical System Error: x679Qs5m" is a scam - clicking "Continue" triggers download of a fake anti-virus suite. These errors typically promote applications such as Mac Ads Cleaner, Mac Adware Cleaner, etc. The apps provide a feature allowing users to perform a 'full system scan', however, the results are false - users are presented with hundreds of "potential threats" that must be eliminated immediately. Free versions of these PUPs are supposedly incapable of eliminating them and users are encouraged to purchase 'full versions'. This is part of the scam. Cyber criminals generate revenue by scaring and tricking gullible users into purchasing useless software. These programs merely clear the false list. Therefore, if you have already installed a fake anti-virus/system optimization tool promoted by fake errors such as "Critical System Error: x679Qs5m", uninstall the software and certainly do not pay for any full version. Removing fake errors is simple: close the web browser. Note that some rogue sites employ scripts that prevent users from closing browsing tabs/windows. In these cases, terminate the browser using Activity Monitor or simply reboot the system. After re-running the browser, do not restore the previous session, otherwise you will return to the malicious site/s.

Potentially unwanted programs deliver coupon, banner, pop-up, and other similar ads. To achieve this, developers employ various tools that enable placement of third party graphical content on any site. Therefore, ads often conceal underlying content, thereby significantly diminishing the browsing experience. In addition, some lead to malicious websites and execute scripts that stealthily download and install malware. Therefore, even a single accidental click can result in high-risk computer infections. Another important issue is information tracking. Potentially unwanted programs record user-system information relating to browsing activity. IP addresses, website URLs visited, pages viewed, search queries, and other recorded data often includes personal details that developers share with third parties (potentially, cyber criminals) who misuse it to generate revenue. Therefore, the presence of information-tracking apps such as Critical System Error: x679Qs5m might lead to serious privacy issues or even identity theft. You are strongly advised to uninstall all potentially unwanted programs immediately.

Threat Summary:
Name"Critical System Error: x679Qs5m" 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 Critical System Error: x679Qs5m 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.

As mentioned above, "Critical System Error: x679Qs5m" shares many similarities with dozens of other fake errors. All claim that the system is infected, missing files or damaged in other similar ways, however, unlike "Critical System Error: x679Qs5m", most fake errors encourage users to call fake 'tech support' to trick them into paying for services that are not required. Potentially unwanted programs are all very similar. By offering a wide range of "useful features", they attempt to give the impression of legitimacy, however, these apps are designed only to generate revenue for the developers. Rather than giving any real value for regular users, PUPs cause unwanted redirects, gather sensitive information, and deliver intrusive advertisements, thereby posing a direct threat to your privacy and Internet browsing safety.

How did potentially unwanted programs install on my computer?

Research shows that, although some PUPs have official download websites, most infiltrate systems without consent, since developers promote them using the aforementioned intrusive advertisements and a deceptive marketing method called "bundling" (stealth installation of PUPs with regular software). Developers hide "bundled" programs within various sections (typically "Custom/Advanced" settings) of the download/installation processes - they do not disclose this information properly. Furthermore, many users rush these procedures and skip steps. In addition, they often click various advertisements without understanding the possible consequences. In doing so, they expose their systems to risk of various infections and compromise their privacy.

How to avoid installation of potentially unwanted applications?

Lack of knowledge and careless behavior are the main reasons for computer infections. Therefore, pay close attention when browsing the Internet and downloading/installing software. Bear in mind that intrusive ads typically seem legitimate, but once clicked, they redirect to dubious websites (gambling, adult dating, pornography, and so on). If you encounter these ads, immediately eliminate all dubious applications and browser plug-ins. Furthermore, select "Custom/Advanced" settings and carefully analyze each step of the download/installation processes. Opt-out of all additionally-included programs and decline offers to download/install them. We strongly recommend that you avoid using third party downloaders/installers, since developers monetize them by promoting PUPs. Software should be downloaded from official sources only, using direct download links. The key to computer safety is caution. If your computer is already infected with PUPs, we recommend running a scan with Combo Cleaner Antivirus for macOS to automatically eliminate them.

Text presented in "Critical System Error: x679Qs5m" error:

Your Mac is infected with (3) critical Virus! Critical System Error: x679Qs5m (Urgent)
Your Mac (MacOS 10.13 High Sierra) system is infected with (3) virus. The pre-scan has found (2) malware and (1) phishing / spyware. Kernel Cache Damage: 28.1% - Immediate Scan is required to prevent system corruption.
May lose your hard drive content in 1 minutes and 30 seconds.

Instant automatic removal of Critical System Error: x679Qs5m 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 Critical System Error: x679Qs5m 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 adware and browser hijackers from a Mac computer:

Potentially unwanted programs removal:

Remove PUP-related potentially unwanted applications from your "Applications" folder:

mac adware 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 "critical system error: x679qs5m" 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.

"Critical System Error: x679Qs5m" virus removal from Internet browsers:

safari browser iconRemove malicious extensions from Safari:

Remove "critical system error: x679qs5m" 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 "critical system error: x679qs5m" 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 "critical system error: x679qs5m" 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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Malware activity

Global virus and spyware activity level today:

Medium threat activity
Medium

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

QR Code
Critical System Error: x679Qs5m 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 "Critical System Error: x679Qs5m" 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.