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.

Zeus botnet

Chris Larsen, Malware Lab Architect for Blue Coat Systems, points to Zeus, first discovered in 2007, as the "king of the botnet kits."

A malware platform unto itself that can be used to create a Trojan horse that steals banking information with man-in-the-browser keystroke logging and form grabbing, Zeus is spread mainly through drive-by downloads and phishing schemes.

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