om4r.exe is a Trojan W32/Rbot-AQP. om4r.exe opens a back door on IRC channels. om4r.exe spreads via open network shares. om4r.exe tries to terminate antiviral programs installed on a user computer. Related files: %System%\om4r.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill om4r.exe process and remove om4r.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.