Zlob fake codec has been update. It drops the following file:
%SYSTEM%\uszhv.dll
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\SharedTaskScheduler]
"{629340b5-8df6-4211-9245-a86563a35792}"="cramping"
It also installs Toolbar, BHO, Antispycheck Rogue software...
SmitfraudFix removes the infection.