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In 2004, Sven Jaschan was found guilt of writing both the Netsky and Sasser worms whilst he was still a teenager. At that point in time, the viruses were considered responsible for 70 percent of all malware present online.
As he was still a teenager, after being convicted, Jaschan was given a suspended sentence and three years probation. However, there was a silver lining -- he was later hired by a security firm.