Competing 'worms' hit US news providers
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The worms had been causing most problems at companies with large, networked computer systems, rather than among individual computer users, said David Perry, a security analyst at Trend Micro Inc, a computer security company. He said the worms could attack a system without needing to open any software, so some users would have been infected without knowing it.
A common symptom of the attack is computers repeatedly restarting. Experts say installing the Microsoft patches is the best preventative action.
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