A US teenager who wrote the Blaster-B worm, which infected around 48,000 computers worldwide and caused hundreds of thousands of pounds of damage to businesses, has been jailed for 18 months.
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The Minnesota man was also sentenced to 10 months' community service when he is released.
Blaster-B burst onto the scene in August 2003 with a successful denial of service attack on the Microsoft website.
The Blaster-B worm, a modification of the more damaging Blaster-A worm that infected many more users in 2002, sparked an international hunt by the FBI for the virus writer.
"An 18-month prison sentence is probably the best that this man could have realistically hoped for," said Graham Cluley, senior technology consultant for anti-virus software company Sophos.
"The US authorities have demonstrated their determination to deal with virus writers and other cybercriminals. This sends out a strong message to other young people that writing viruses is a fool's game."
The writer of the Blaster-A worm is still at large despite having a £150,000 bounty on their head.