When you open a quarantined file, the file quarantine feature will check to see if it may include known malware.įile Quarantine includes only a handful of signatures and has been updated fairly infrequently. Mac OS X v10.6 Snow Leopard builds upon the existing unsafe file type check by also checking for known instances of "malware", or malicious software. The no-frills antivirus program included as part of the File Quarantine feature was originally documented in Apple support article HT3662: This option appears in Security preferences after Security Update 2011-003 is installed.Īpple partisans have bragged for years that Macs don’t need antivirus software, but Apple has quietly said otherwise. If you do not wish to receive these updates, you can disable daily update by unchecking "Automatically update safe downloads list" in the Security pane, in System Preferences. Here's the detection result for the third variant, : The signatures, which began being pushed out via the new automatic update mechanism sometime on June 1, now include three variants of the malware. Update June 2, 4:45AM PDT: Apple has updated its XProtect signatures to address the most recent version of Mac Defender. On a test system using Safari with default settings, it behaved exactly as before, beginning the installation process with no password required.Īs PC virus experts know, this cat-and-mouse game can go on indefinitely. That's less than 8 hours after Apple's security update was released. The file has a date and time stamp from last night at 9:24PM Pacific time. ![]() This one has a new name, Mdinstall.pkg, and it has been specifically formulated to skate past Apple's malware-blocking code. Hours after Apple released this update and the initial set of definitions, a new variation of Mac Defender is in the wild. Update June 1, 6:00AM PDT: The bad guys have wasted no time.
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