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 Trojan will penetrate the machine hijacking the browser. Will also download an adware payload from the internet. Most of the time the payload will include rogue anti-spyware applications.
Removal is difficult.