That came after he discovered Appify, a legitimate tool that had also managed to get past Gatekeeper checks back in 2011 with a tool allowing developers to create simple macOS apps with just a script.
He found that certain scripts within apps were not checked by Gatekeeper. The bug was first reported to Apple by security researcher Cedric Owens, who discovered it in mid-March. That XProtect update will happen automatically and retroactively apply to older versions of macOS. An Apple spokesperson said the company has now addressed the issue in macOS 11.3 and updated XProtect, its malware detection, to block the malware using this technique.
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