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.

Stuxnet

Discovered in 2010, Stuxnet exploited several critical vulnerabilities in Windows which until then were unknown, including one guaranteeing its execution when inserting an infected USB key into the target system – even if a system's autorun capabilities were disabled, says FortiGuard Labs' Lovet.

From the infected system, Stuxnet was then able to spread into an internal network, until it reached its target: an industrial control system manufacturered by Siemens. In this particular instance, Stuxnet knew the weak point with a specific controller – and most likely intended to destroy or neutralize the industrial system.

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