Winvnc.exe is a mass-mailing worm W32.Mytob.EU@mm. Winvnc.exe tries to terminate antiviral programs installed on a user computer. Winvnc.exe opens a back door on TCP port 27999. Related files: %System%\winvnc.exe Adds the value: "WINDOWS SYSTEM" = "winvnc.exe" to the Windows startup registry keys. More info: http://securityresponse.symantec.com/avc... Removal: Kill winvnc.exe process and remove winvnc.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.