The “first” OS X Trojan has been discovered, although it’s more of a proof of concept than anything serious.
OS X is relatively impervious to viruses and trojans, largely because you need to give programs permission before they can get anywhere serious on your computer. However, this one uses good old-fashioned social engineering by pretending to be something users might want to see. If they aren’t suspicious and enter their system password, then the trojan gets to do its stuff.
I wouldn’t rush out and buy Mac OS X anti-virus software just yet, but this wee beastie does prove that Mac owners shouldn’t be smug. The weakest link in any security system is usually a human being, and Mac owners can be just as dumb as PC owners.