Zlob fake codec has been update. It drops the following file:
%SYSTEM%\obicx.dll
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\SharedTaskScheduler]
"{fb357e54-83f1-4a3c-80a2-319201ed6c17}"="bisque"
It also installs Toolbar, BHO, Virus Response Lab 2009 software...
SmitfraudFix removes the infection.