Apple has just released a security update for Mac OS X that is designed to detect and remove Mac Defender malware. But unless you're running the latest 'Snow Leopard' version, you're outta luck.
Apple security update 2011-003 (only for Snow Leopard) consists of three components:
File Quarantine Malware detection definitions for OSX.MacDefender.A has been added to the File Quarantine system.
Automatic Updates The system will check daily for updates to the File Quarantine malware definition list. An opt-out is available.
Malware Removal The update will scan and remove Mac Defender and known variants.
This update is available for Mac OS X v10.6.7 and Mac OS X Server v10.6.7 (if you're using an earlier version of Mac OS X, tough, Apple doesn't love you) via Software Updates or via Apple Downloads. No reboot required.
Hello Mac OS X users, welcome to the world of daily malware signature updates.