Here's what to do if you suspect a malware infection on your Mac—and how to get rid of it.
Otherwise, cut your device off from the internet, and don't reconnect until you are sure the threat is gone. You should also avoid signing into any accounts that require credentials, as some malware includes keylogging capabilities that steal your passwords.
Restart in safe mode
To restart an Apple silicon Mac in safe mode, go to the Apple menu > Shut Down and wait for your device to turn off completely. Then press and hold the power button until Loading startup options appears. Select a volume (likely Macintosh HD for most) then press and hold Shift and click Continue in Safe Mode. When your device restarts, you'll see Safe Boot in the menu bar.
You can also confirm that you're in safe mode by pressing and holding Option, then choose Apple Menu > System Information > Software. Under System Software Overview, look for Boot Mode: Safe. If it says Boot Mode: Normal, you are not in safe mode.
Monitor your Mac's activity
Activity Monitor on macOS shows you real-time information about processes running on your device, including memory usage and activity across disks and networks. This is a good way to identify suspicious programs or processes that may be malware.
Malware can also modify browser settings, so you should reset any browsers on your Mac to their defaults. Safari doesn't have a singular restore settings button, but you can manually reset it to its default by clearing browsing data.
Help > More Troubleshooting Information and click Refresh Firefox > Refresh Firefox > Finish.
Extensions (Extensions & Themes on Firefox).
Remove temporary files
If you want to delete these temporary files yourself, however, here's how: Open a Finder window and press and hold Shift + Command + G. Type ~/Library/Caches into the search bar to pull up temporary files, select any you want to delete to open them in a Finder folder, and press Command + Delete (or Control + click > Move to Trash) to move to Trash. You'll also want to empty the Trash to delete the files permanently from your device.
Restart (or reinstall) macOS
While you can restore from a backup to make things the way they were before the reinstall, note that you should only do so if you are sure the backup was made before your device was infected with malware. If there's a chance you made a backup with the malware infection in place, don't use it.
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