Bulk of year's PC infections pinned to one man - News - ZDNet:
Sven Jaschan, self-confessed author of the Netsky and Sasser viruses, is responsible for 70 percent of virus infections in 2004, according to a six-month virus roundup published Wednesday by antivirus company Sophos.

The 18-year-old Jaschan was taken into custody in Germany in May by police who said he had admitted to programming both the Netsky and Sasser worms, something experts at Microsoft confirmed. (A Microsoft antivirus reward program led to the teenager's arrest.) During the five months preceding Jaschan's capture, there were at least 25 variants of Netsky and one of the port-scanning network worm Sasser.

Graham Cluley, senior technology consultant at Sophos, said it was staggering that one person could be responsible for so many infections. Richard Starnes, president of security industry group ISSA UK, was also impressed: "Is he going to put this on his CV?" he asked.