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Apple Updates Xprotect Malware Definitions To Stop 'iWorm' Mac Botnet

Apple this weekend updated its XProtect blacklisting system for malware in OS X to address the recent iWorm attack, which is believed to have affected more than 18,000 Macs. According to MacRumors and Business Insider, a change to the XProtect.plist file that was released on October 4 contained definitions to safeguard users from three variations of the iWorm malware, including OSX.iWorm.A, OSX.iWorm.B, and OSX.iWorm.C.



Researchers from security firm Dr Web discovered the malware. Russian anti-virus company Dr Web, the iWorm malware targeted OS X machines, forming a botnet that was organized through a server list published on Reddit. Although it's not clear how the malware spread, a report from The Safe Mac suggests that the malware was distributed with pirated Mac software downloaded from The Pirate Bay.



In addition to Apple's antimalware actions, Reddit also shut down an untrue Minecraft subreddit and banned the account responsible for posting the iWorm botnet server list on the subreddit's forums. iWorm-controlled Macs aren't able to connect to botnet servers used by hackers to send instructions.
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