Nasty worm wriggles into millions of computers

A nasty worm has wriggled into millions of computers and continues to spread, leaving security experts wondering whether the attack is a harbinger of evil deeds to come.

US software protection firm F-Secure says a computer worm known as "Conficker" or "Downadup" had infected more than nine million computers by Tuesday and was spreading at a rate of one million machines daily.

The malicious software had yet to do any noticeable damage, prompting debate as to whether it is impotent, waiting to detonate, or a test run by cyber-criminals intent on profiting from the weakness in the future.

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