Security Update 2011-003 Addresses Mac Defender Malware

Apple:

The OSX.MacDefender.A definition has been added to the malware check within File Quarantine. […]

The system will check daily for updates to the File Quarantine malware definition list. An opt-out capability is provided via the “Automatically update safe downloads list” checkbox in Security Preferences.

★ Tuesday, 31 May 2011