According to data collected by Kaspersky Lab, almost 700,000 infected users have been counted at the beginning of April and the number could be higher. In September 2011, the first versions of the Mac OS X trojan Flashback have appeared, however, they didn’t really become widespread until March 2012. Until recently, Mac OS X malware was a somehow limited category and included trojans such as the Mac OS X version of DNSChanger and more recently, fake anti-virus/scareware attacks for Mac OS X which boomed in 2011. The number has grown switfly during the past years we expect this growth to continue.

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