Zlob fake codec has been update. It drops the following file:
%SYSTEM%\yizgdux.dll
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\SharedTaskScheduler]
"{ba934431-76af-4c99-93c2-c3d21944a72e}"="chokestrap"
It also installs Toolbar, BHO, Antispycheck Rogue software...
SmitfraudFix removes the infection.