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.
Official
Description:
Symantec:
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Gives its creator full control over your computer.
Opens port 23, by default.
Is written in the Visual Basic (VB) programming language.
Needs the VB run-time libraries installed for it to work.