Monday, January 13, 2020 [Tweets] [Favorites]

macOS Filename Homoglyphs Revisited

Adam Chester (tweet):

Last year I posted a few tricks to help when targeting MacOS users, and included a technique useful for spoofing file extensions with the aim of taking advantage of Finder’s removal of the .app extension from certain filenames.

A few weeks ago I was about to use this on an engagement and found that Apple had patched the tricks presented previously. While this was frustrating for me as an attacker, it did provide an opportunity to dig into the fix, understand just how filenames are now being sanitised by MacOS Catalina, and see if I could bypass this again.

See also: Howard Oakley.

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