The warning of "System Mac OS is infected" popped up by Mac computer? Don’t panic! This article will guide you on how to deal with this malware pop-up and keep your Mac safe.

First of all, the good news is that your Mac is likely to be free from virus infection. The bad news is that you may have been attacked by malicious browser extensions or adware that sends fake virus warning messages. But the better news is that we will show you how to solve this problem.

What is the "System Mac OS infected" pop-up window?

The "System Mac OS is infected" pop-up window will appear in the notification area of ??macOS. It claims your system needs to take steps to remove malware, such as installing specific software—but it is a total scam designed to make profits for criminals.

Why do you receive a notification of "System Mac OS infected"?

When you browse the web page, a notification "System Mac OS is infected" may appear. It's designed to look like a real alert from macOS, thus inducing you to click. In our experience, this usually happens when users allow malicious websites to send push notifications.

How to delete the "System macOS infected" pop-up window from Mac?

The following steps will help you clear these unwanted notifications:

1. Check for unwanted applications and add-ons
2. Close all open web browsers
3. Reset your web browser
4. Delete suspicious extensions
5. Clean your Mac with antivirus software

1. Check for unwanted programs or add-ons

First of all, you need to check if the notification is really caused by malware. It is recommended that you check Activity Monitor to see if malware was downloaded accidentally. The method is as follows:

1. Open Activity Monitor from "Applications">"Utilities">"Activity Monitor".
2. View the currently running application and background process .
3. If you see any suspicious content, double-click and select Exit, and then Exit or Forcibly exit.

2. Close all open web browsers

Next, you should exit the browser. It is recommended to use the "Force Quit Application" tool:

1. Press Cmd Opt Esc to open Force quit the application .
2. Select the browser you want to close. Click to force exit . In the pop-up window, click
forcibly exit
3. to exit the browser immediately.

3. Reset your browser

Resetting the web browser can prevent the pop-up "System Mac OS is infected" from appearing.

3.1 Reset Safari to default settings

Safari does not have a quick reset feature, but you can reset it manually:

1. Select History > Clear History from the Safari menu bar.
2. Click Clear history.
3. Select Safari > Set. In the Privacy section, click Manage website data.
4. Click Remove all and then Remove .

3.2 Reset Chrome on Mac

You can manage notifications in Chrome and reset it completely in a few simple steps:

1. In Chrome, select Chrome > Set from the menu bar.
2. Select from the sidebar to reset settings . Click to restore the setting to its original default value .
3. Select Reset settings .

3.3 How to reset Firefox

Resetting Firefox browser can help solve annoying pop-up problems:

1. In the Firefox menu bar, select Help > More troubleshooting information.
2. Click Refresh Firefox.
3. In the pop-up dialog box, click to refresh Firefox.

4. Delete suspicious extensions

Resetting your web browser may disable extensions, but they won't be deleted. Please manually delete the browser extension as suggested below.

4.1 Remove unwanted extensions from Safari

If you want to remove the extension from Safari, follow the prompts:

1. Open the Safari's Settings menu. In the Extensions tab, if you see the extension you want to delete, click its Uninstall button.
2. Click to display in Finder. Remove the extension from your system.

4.2 Delete Chrome extension

Think there may be malicious add-ons in your Mac version of Chrome? Please delete them as suggested below:

1. In your Chrome settings, select extension from the sidebar.
2. If you see the extension you want to delete, click its Delete button.
3. Click again to delete .

4.3 Delete Firefox extension

Firefox add-ons are great, but if they cause problems you need to clear them. This is what we do:

1. In the Firefox menu bar, select Tools > Add-ons and themes .
Check which extensions are installed in Firefox. Have you found the extension you want to delete? Click the three dots
2. next to it, and select Delete . Click
Delete
3. to confirm the deletion.

5. Use anti-malware

Unneeded notifications may be signs of malware infection, and if you click on them, they may download and install ransomware and other viruses. Therefore, we strongly recommend that you check your Mac for viruses. You can quickly and easily scan your Mac using

tool:

1. In MacKeeper, select Anti-Virus from the side menu, and then click the Start Scanning button.
2. Waiting for the scan to complete. If MacKeeper finds anything suspicious, select it and click Delete . Select again to delete to confirm.

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