What means Critical System Error: x679Qs5m message?

“Critical System Error: x679Qs5m”, as well as “Dear user, congratulations” is a fake alert, cyclically showing fake information when the user starts to open a new tab in your Mac browsersL Google Chrome, Safari and others. It reports that user’s Mac has 3 viruses.
Critical System Error: x679Qs5m
Here is the full text of scam:

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.

The main purpose of Scams is to force victims to call on fake software support, for solving fake PC, Mac or iPhone error or for taking a prize. Users don’t realize, that their device was hacked and try to call. Of course, all criminals instructions can include a purchase of useless tools or other money transactions. Our advice: don’t pay for anything! Be careful, Apple never sends unsolicited email messages or make unsolicited phone calls to request personal or financial information or fix your computer. Our advice: remove “Critical System Error” using our article (below).

How Scam gets on your device?

Most of the viruses hidden come on PC, Mac, iPhone/iPad by malicious emails, network attacks, malware sites, or with other freeware software. Few are closely watching the installation process, and sometimes do not know that their device is at risk. We recommend to read the user agreement and don’t press “Next” button once. Make sure that the program is safe. Select advanced installation type. Remember that there are many similar programs on the Internet. Read reviews about the programs, and if your device is already infected by popups or scam, please use the instructions below.

How to remove Critical System Error and other scam viruses from your Mac, PC or iPhone?

To uninstall scam, remove it from Applications, then delete all leftover files and folders.

In our view, Bitdefender has most of newest scam-viruses threats in the database. Please, use it to remove annoying pop-ups and to prevent your PC, Mac or iPhone infiltration.

Recommended Solution:

Bitdefender – fully removes all instances of viruses, similar to pop-up or scam virus from all devices and browsers. Compatible with Windows, Mac, Android and iOS


Download Norton

Or uninstall virus manually.

Step 1: Remove pop up from Mac

Pop up may not have app associated with it in Application. However, we recommend you to inspect the list of installed applications and remove unknown or suspicious ones.

Mac OSX:

  1. Check all apps on your device, find malware apps(their names ussually are simmilar with scam name)
  2. Open Finder
  3. In the Finder sidebar, click Applications
  4. If you see Uninstall pop up or pop up Uninstaller, double-click it and follow instructions
  5. Drag unwanted application from the Applications folder to the Trash (located on the right side of the Dock)

Learn more about uninstallation of programs in Mac OSX

appcleanerTo remove leftover items of unwanted application on Mac we recommend you to use AppCleaner. Just drag application you want to remove to AppCleaner window and it will search for residual data on your hard drive. This will save space of your memory and will help to remove stubborn applications from Mac systems.

After that remove pop up from your browser.

iPhone/iPad iOS:

If you get a pop-up, close it. Don’t “like” it, and don’t open it, to prevent more malware infiltration into your phone. Certain third-party download sites might include programs that you don’t want with the software that you install.

    remove popup from ios
  1. Check all apps on your device, find malware apps(their names ussually are simmilar with scam name)
  2. Touch and hold the app until it jiggles
  3. Tap cross in the upper-left corner of the app
  4. Tap Delete

Step 2: Remove pop up from browsers


  1. Open Safari
  2. Click Safari menu.
  3. Choose Extensions.
  4. Find Pop up.
  5. Click Uninstall button to remove it.

Learn more about removing extensions from Safari.

Google Chrome:

  1. Open Google Chrome
  2. Push Alt + F.
  3. Click Tools.
  4. Choose Extensions.
  5. Find apps related with scam.
  6. Click the trash can icon to remove it.

Learn more about removing extensions from Chrome.

Mozilla Firefox:

  1. Open Firefox.
  2. Push Shift + Ctrl + A.
  3. Choose pop up related apps.
  4. Click Disable or Remove button.

Learn more about removing extensions from Firefox.

Information provided by Tim Kas

1. Click on “Home” button and swipe Safari upwards
2. Go to: Settings -> Safari
3. Clear History and Browsing Data

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