Perfhmon.exe is a Trojan.Banklis-A. Perfhmon.exe monitors user Internet activity and bank information. It sends stolen data to a hacker site. Related files: %System%\Perfhmon.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill Perfhmon.exe process and remove Perfhmon.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.