The engine is from Clam AntiVirus (ClamAV), an open source (GPL) and free anti-virus toolkit.
HijackThis symptoms:
O2 - BHO: StatusBarPane - {CCB5551D-8594-4999-85F9-1E3EABCB95AC} - C:\Program Files\Contraviro\IEAddon.dllNotice the LSP Hijack. Removing siglsp.dll file without restoring the LSP chain will break Internet connexion.
O4 - HKLM\..\Run: [Contraviro] C:\Program Files\Contraviro\Contraviro.exe
O10 - Unknown file in Winsock LSP: c:\program files\contraviro\siglsp.dll
O10 - Unknown file in Winsock LSP: c:\program files\contraviro\siglsp.dll