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 installs several products without the user's knowledge. Files like drsmartload will be installed in your Windows and system32 folders as a result of this infection.
Common results of the infection include an abunance of pop-ups that relate to rogue anti-spyware cleaners.