Cyberattacks have taken U.S. bank websites offline for 249 hours total in the last six weeks. "Literally, these banks are just in war rooms, sitting at controls trying to stop [the attacks]," says Avivah Litan, a bank security analyst with Gartner Group. "The frightening thing is [the attackers] are not using as much resources as they have on call. The attacks could be bigger."

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