In Pictures: 20 notorious worms, viruses and botnets

The earliest worms and viruses were created for geeky fun and did little harm - oh, how times have changed. Here are 20 worms, viruses and botnets that show the evolution of malware, from Creeper to Flame.

Storm botnet

By 2007, Lovet notes cybercriminals already had lucrative business models in place. Before then, however, botnets were fairly fragile: By neutralizing its unique Control Center, a botnet could be completely neutralized, because the bots no longer had anyone to report to or take commands from.

By implementing a peer-to-peer architecture, Storm became the first botnet with decentralized command.

At the peak of the epidemic, Storm had infected between 1 and 50 million systems and accounted for 8 percent of all malware running in the world.

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