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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In 2004, Sasser malware exploited a vulnerability in Microsoft Windows to propagate, which made it particularly virulent. What’s more, due to a bug in the worm’s code, infected systems turned off every couple of minutes, says Lovet.

More than one million systems were infected, AFP’s communications satellites were interrupted for hours, Delta Airlines was forced to cancel flights, the British coast guard had to go back to print maps, and a hospital had to redirect its emergency room because its radiology department was completely paralyzed by the virus. The damage amount was estimated to be more than $18 billion.

Microsoft placed a $250,000 bounty on the author’s head, who turned out to be an 18-year old German student.

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