Trojans are malicious applications that pose themselves as legitimate software in order to trick users to install them. Once on the victim's machine, it may run any number of malicious process to steal vital information or inflict damage to other software.
This is a multimedia program that centers around pornographic material. It is installed by other trojan downloaders related to New.Net.
This is an image of Downloader-ADV installing a codec under the disguise of a microsoft component. This is actually an installer for Pornoplayer.
This is a screen capture of the site you are taken to once Downloader-ADV is fully installed. From here, Pornoplayer is pushed on the user.
This is the screen that the user sees when usercodec1176.exe is ran.