Mo.exe is a Backdoor W32.Kelvir.AL. Mo.exe spreads via MSN Messenger. Mo.exe tries to terminate antiviral programs installed on a user computer. Mo.exe monitors user Internet activity and private information. It sends stolen data to a hacker site. Related files: %ProgramFiles%\slp\mo.exe %ProgramFiles%\slp\syatem.exe %System%\aolmsg.exe Adds the value: "Aol Instant Messenger" = "aolmsg.exe" to the Windows startup registry keys. More info: http://securityresponse.symantec.com/avc... Removal: Kill mo.exe process and remove mo.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.