Ssmss.exe is a Backdoor W32.Gaobot.DXO. Ssmss.exe spreads via open network shares. Ssmss.exe tries to terminate antiviral programs installed on a user computer. Related files: %System%\ssmss.exe Adds the value: "IE6" = "ssmss.exe" to the Windows startup registry keys. More info: http://securityresponse.symantec.com/avc... Removal: Kill ssmss.exe process and remove ssmss.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.