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.
From the Website:
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Functions: Send messages or questions to the victim
open the default browser at the specified address
hide or show the Start button
take a screen shot of the victim's desktop
The SubSeven backdoor was first discovered in May, 1999. First samples of this backdoor were not packed, but later some packed versions appeared which were not easy to detect with contemporary anti-virus programs that had no Win32 'Aspack' file compressor unpacking support. The backdoor is usually distributed under different names via newsgroups and e-mails.