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Virus-like program that spreads automatically to other computers by sending itself out by email or by any other means. A program that propagates itself by attacking other machines and copying itself to the affected machine.
Worms have self-replicating code that travels from machine to machine by various means. A worms first objective is merely propagation. Worms can be destructive depending on what payload they have been given. Worms may replace files, but do not insert themselves into files.
This is a P2P related worm. When running on the machine, it invokes the P2P application and starts spreading its copies as WINRAR archives.
It also downloads other malware that may crash the whole system.
It installs a service that runs in background and invokes P2P application, each time it is terminated.