[cjbprime]

This (FS write access == game over) is usually true on Linux, but the Mac and Windows codesigning infrastructures exist to offer some protections and user warnings in this case, and they're what's being defeated by this attack.

[kogir]

With FS access you can just strip the signature entirely and it’ll run without any fuss. In this case it’s the machine that’s compromised, not the app.