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.

Elk Cloner

Written in 1982 "by a 15-year old as a way to booby trap his friends' Apple II computer systems without physical access to them, Elk Cloner spread via floppy disks," according to FortiGuard Labs's Lovet. "Infected machines displayed a harmless poem, dedicated to the virus' glory."

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