A new version of the Sasser worm has appeared after the arrest of a teenager suspected of writing the original - but it will not be much of a threat to users who have already patched their systems.
The Bobax worm, which is less than a week old but has already spawned four variants, is one of the first worms to conduct a bandwidth test on its infected host to see if it is worthy of being used as a spam zombie.
A German judge on Friday handed down a suspended sentence of one year and nine months to the teenager who admitted he created last year's Sasser computer worm.
Antivirus companies discovered a fifth version of the Sasser variant this weekend, within hours of German police arresting an 18-year-old man who confessed to being the Sasser worm's author.
Who knows what the authors of Netsky and Sasser are thinking. Robert Vamosi offers some speculation based on messages left inside recent viruses by the authors themselves.
Is the war on cyber crime as simple as pointing the finger at China, Russia and the US? We investigate whether these parts of the world are being unfairly blamed.
Attorney Hemanshu Nigam says virus writers "ought to think twice before they hit the send button."
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