When Owens copied those techniques and tested his mock malware, he did it on an up-to-date macOS with the Gatekeeper settings set to the most restrictive. 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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