mfs.exe is a Trojan W32.Rbot-ANF. mfs.exe opens a back door on IRC channels. mfs.exe spreads via open network shares. Related files: %System%\mfs.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill mfs.exe process and remove mfs.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.