Zlob fake codec has been update. It drops the following file:
%SYSTEM%\rkaxfza.dll
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\SharedTaskScheduler]
"{eb9f614b-ea44-40d0-8829-542e4f254739}"="garcea"
It also installs Toolbar, BHO, VirusHeat Rogue software...
Use SmitfraudFix to remove the infection.