Svchost.dll is a Trojan Backdoor.Shellbot. svchost.dll spreads via open network shares. svchost.dll tries to terminate antiviral programs installed on a user computer. Related files: %Windir%\system\svchost.exe %Windir%\system\svchost.dll %Windir%\system\svchosthook.dll Adds the value: "WindowsUpdate" = "%Windir%\system\svchost.exe" to the Windows startup registry keys. More info: Removal: Remove svchost.dll from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.