Online banking customers should be wary of a new series of Trojan horses out to filch financial information, said a security firm Monday.

The Tolger line of Trojan horses, said U.K.-based Sophos, target online users of a slew of British-based banks, including users Barclays, HSBC, Lloyds, and Nationwide. . . .

Online banking customers should be wary of a new series of Trojan horses out to filch financial information, said a security firm Monday.

The Tolger line of Trojan horses, said U.K.-based Sophos, target online users of a slew of British-based banks, including users Barclays, HSBC, Lloyds, and Nationwide.

Unlike phishing attacks, which come in singly as individual e-mails, one the Tolger Trojan infects a system, it sits invisibly in the background, monitors which Web sites are put on the browser, and if it recognizes one as an online banking site it ambushes the user by capturing keystrokes and snapping screen shots.

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