As promised, Apple has released a security update to protect users from the Mac Defender ‘scareware’ targeting Mac OS X since last month. The patch, available for download as Security Update 2011-003, will update the File Quarantine feature in Mac OS X 10.5 and 10.6 to block the offending malware and upon installation it will also scan systems for previous infections. If known malware is found, users will get a warning message advising to delete the file:

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