TheCoreWithin

"The infected pages bring up what appears to be a pornographic web site. Upon loading the page, a 'fake codec' social engineering attack is attempted. The user is told that in order to view the movie on the page, a special video codec must be installed.

The user then downloads a trojan program which installs a malware package on the users system then delivers a fraudulent error message telling the user that the supposed codec could not be installed."

Taken from here.