twunk_64.exe is a Trojan.Graybir-AE. twunk_64.exe opens a back door. twunk_64.exe monitors user Internet activity and private information. It sends stolen data to a hacker site. Related files: %Windows%\twunk_64.exe %Windows%\t42qvknq.dll More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill twunk_64.exe process and remove twunk_64.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.