First ever virus for Mac OS X discovered

OSX/Leap-A worm spreads via iChat instant messaging software
16 February 2006

Experts at SophosLabs™, Sophos's global network of virus, spyware and spam analysis centers, have announced the discovery of the first virus for the Apple Mac OS X platform. The virus, named OSX/Leap-A (also known as OSX/Oompa-A) spreads via instant messaging systems.

... "Some owners of Mac computers have held the belief that Mac OS X is incapable of harboring computer viruses, but Leap-A will leave them shellshocked, as it shows that the malware threat on Mac OS X is real," said Graham Cluley, senior technology consultant for Sophos. "Mac users shouldn't think it's okay to lie back and not worry about viruses."

Source and full story: Sophos Antivirus