Gottcha
Step 1: send 10 copies of this message to other computer users.You have to uncompress the virus. Then you have to intentionally install the virus to your computer.
Step 2: smash your computer into tiny bits with a sledge hammer.
And even if you were stupid enough to do all that OS X wouldn't allow any changes to your system files as they're all protected by root.
The company that's hyping this all up just (coincidentally mind you) entered the mac instant message virus scanning market. A market that didn't exist until now.