Hackers have taken the computer virus to a new level with an elaborate "pump-and-dump" scheme that manipulates stock prices, experts say.

The Storm, a worm program which masquerades as an Internet greeting card from a friend or relative, has already infected millions of computers around the world and its reach is said to be expanding daily.

The worm relays contact information to a hacker who uses the addresses to e-mail documents recommending hot stock tips -- driving up prices so he can profit.
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