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.

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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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In Pictures: 20 notorious worms, viruses and botnets

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