Viruses are installed on other servers to generate money, generate BTC, or contribute to attacks.

Money-making viruses require a Virus Collector to collect income.

Spam Virus generates money based largely on the target server's CPU.

Warez Virus generates money through warez traffic. It requires Torrent support.

Miner Virus generates Bitcoin based largely on CPU.

DDoS Virus contributes power to DDoS attacks. See DDoS.

Doom is storyline software. It may have special rules and may not behave like normal viruses. See Storyline.