Intenat.exe is a Trojan.Nuclear-J. Intenat.exe opens a back door. Related files: %System%\Intenat.exe %System%\Notepad.txt More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill Intenat.exe process and remove Intenat.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.