https://techcrunch.com/2021/04/26/shlayer-mac-malware-macos-security/

Apple has spent years reinforcing macOS with new security features to make it tougher for malware to break in. But a newly discovered vulnerability broke through most of macOS’ newer security protections with a double-click of a malicious app, a feat not meant to be allowed under Apple’s watch.

Worse, evidence shows a notorious family of Mac malware has already been exploiting this vulnerability for months before it was subsequently patched by Apple this week.