Internet Security and Programming

Hackers on Tuesday hijacked the Web site CheckFree.com, one of the largest online bill payment companies, redirecting an unknown number of visitors to a Web address that tried to install malicious software on visitors’ computers, the company said today. The attack, first reported by The Register, a British security news Web site, began in the early morning hours of Dec. 2, when Checkfree’s home page and the customer login page were redirected to a server in the Ukraine. CheckFree spokeswoman Melanie Tolley said users who visited the sites during the attack would have been redirected to a blank page that tried to install malware. Tolley added that CheckFree regained control over its site by 5 a.m. on Dec. 2. The company said it was still having the malware analyzed by experts. “The degree of exposure to users is dependent on how current their anti-virus software is and what browser they

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