vbstub.exe is a Trojan.Agent-EU. vbstub.exe monitors user Internet activity and private information. It sends stolen data to a hacker site. Related files: system.exe libHide.dll systemup.exe vbstub.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill vbstub.exe process and remove vbstub.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.