ALERT: MacDefender/MacGuard Mac OS X Security Update 2011-003 Is Now Available

Update 5/31/11 18:43: Early Twitter reports indicate that OS X security update designed to target MacDefender missed finding MacGuard. Be aware that there could still be malware on your Mac if you were infected prior to the new update. Also, it is now being reported by zdnet.com, that MacDefender/MacGuard is now spreading via Facebook.
Security Update 2011-003 is now available and addresses the
following:
File Quarantine
Available for: Mac OS X v10.6.7, Mac OS X Server v10.6.7
Impact: Definition added
Description: The OSX.MacDefender.A definition has been added to the
malware check within File Quarantine. Information on File Quarantine
is available in this Knowledge Base article:
http://support.apple.com/kb/HT3662
File Quarantine
Available for: Mac OS X v10.6.7, Mac OS X Server v10.6.7
Impact: Automatically update the known malware definitions
Description: 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. Additional information is available in this
Knowledge Base article: http://support.apple.com/kb/HT4651
Malware removal
Available for: Mac OS X v10.6.7, Mac OS X Server v10.6.7
Impact: Remove the MacDefender malware if detected
Description: The installation process for this update will search
for and remove known variants of the MacDefender malware. If a known
variant was detected and removed, the user will be notified via an
alert after the update is installed. Additional information is
available in this Knowledge Base article:
http://support.apple.com/kb/HT4651
Update 9/27/11: Thanks Microsoft! Botnet that hosted MacDefender scareware/malware shut down thanks to Microsoft. http://t.co/LNpIXZWx

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