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.
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 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.
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.
Despite the Sasser worm, PCs are now safer than they were four years ago - but only if users observe basic precautions, say security experts.
A year on, and the company's US$1 million tip-off program has nabbed just one (alleged) virus writer. Is it a bust?
It is not only the staff at RMIT Labs who have been busy, virus writers worked hard too.
While XP SP2 is a huge step forward for Microsoft, there are important caveats. For example, don't expect the new Windows Firewall to prevent keystroke-logging Trojans from stealing your credit card info.
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