IE Defender/Files Secure/MalwareBell Codec has been update, it installs files with semi-random filenames, composed from fragment words: sim, op, ku, _de, _uk, _us, 16, 32, 64...
Files could be: simop_de32.dll, simku_uk16.dll...
and displays alert messages:
Use SmitfraudFix to remove the infection.