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