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Apple today released Security Update 2011-003 (Snow Leopard), a new software update that addresses the "Mac Defender" malware that has been afflicting Mac users over the past month.



From MacRumors:
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.The update weighs in at 2.36 MB and requires Mac OS X 10.6.7.
  Apple Addresses 'Mac Defender' Threat With Security Update 2011-003 for Snow Leopard