A Russian antivirus company apologized Friday for an e-mailed virus alert that was infected with the very worm the message was supposedly designed to warn against.

Kaspersky Labs said the message, sent Thursday to subscribers of the company's "Virus News" e-mail dispatch, had actually been sent by hackers masquerading as the company. The hackers had managed to break into Moscow-based Kaspersky's computer system and steal the mailing list for the newsletter, the company said.

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