MP3Concept is the first trojan horse for Mac OS X, created around April 2004. MP3Concept is benign, it was designed as a proof of concept regarding how a file can be disguised to an end user in a GUI environment on Mac OS X. It is an application bundle that looks like an MP3 file. When launched, it plays a clip of a man laughing. Since its creation Apple has added additional verifications to the Finder to prevent such an attack. Antivirus software also now looks for its characteristics as well.

This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. (March 2010)

• Symantec profile
• DownloadCheck - a simple utility by The Iconfactory to verify files are files, not applications

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