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.
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L4D Logger is a keylogger trojan centered around the Steam Instant Messaging application. It is distributed as a sound editing tool for Half-Life 2 and Left 4 Dead, but monitors keystrokes entered in by the user in the Steam program.
