New Mac malware variant disables OS X defenses | "#Google+, +1, Facebook, Twitter, Scoop, Foursquare, Empire Avenue, Klout and more" | Scoop.it
From www.scmagazineus.com - October 19, 2011 6:27 PM
Malware writers arent waiting long between releasing new variants for a Mac trojan known as Flashback. The latest is designed to disable builtin antivirus on target machines.

Via Gust MEES