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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From Viruslist.com
This Trojan was sent to several Internet newsgroups in August 1998. The Trojan itself is a 25Kb Windows executable file (NE format) written in Pascal. It accesses the network and sends random messages to the Internet.
When run for the first time, the Trojan just installs itself in the system. It copies itself to the Windows system directory with the SHELL32.EXE name and registers in the system Registry in HKEY_LOCAL_MACHINE section:
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