IE Defender/Files Secure/MalwareBell/IE Antivirus Codec has been update, it installs files with semi-random filenames, composed from fragment words: t, p, b, a, o, u, pdf, sdg, pls, an, o, im
Files could look like: paplsan.dll, pasdgo.dll, tasdgo.dll ...
and displays alert messages with popups:
Use SmitfraudFix to remove the infection.