Here I am))) I have already upgraded to Big Sur, and it has been a while since I had that issue. It was so nasty that it made me take a dozen of screenshots. I have tried MalwareBytes and MacBooster, both failed to detect the malware. The malware (I assume it was one) was named Quick Mac Fixer.
Quick indeed, and super stubborn as it loaded its voice message with a nice female voice, slight accent like Eastern European (maybe), telling something like blah blah blah there are malware and memory hogs on your mac, please let me remove'em all. It 'found' hundreds of threats in a bling of an eye.
I could not remove it manually, it simply would not let me sending it to Trash. I assume it kept its processes running on the background that prevented the removal.
Fortunately, the scareware does not seem to be compatible with Big Sur, but there are still many users around running lower versions of macOS. The outrageous thing is that the malware is still available for download, its website is not even marked unsecure or something.
