Have you asked Sophos in that case? I see they have a page on that particular infection with removal instructions and they also ask that samples be submitted to them.
Every antivirus maker gives different titles to malware so I have no idea what McAfee calls it. Best to submit a sample: http://www.mcafee.com/us/threat-center/resources/how-to-submit-sample.aspx
Message was edited by: Ex_Brit on 29/11/13 3:36:21 EST PM
Then I have no idea. As you're using Sophos products best ask on their forums: http://community.sophos.com/
Or there's a MAC one here: http://openforum.sophos.com/t5/Sophos-Anti-Virus-for-Mac-Home/bd-p/FTT_MAC_MAGNET