An estimated 2.5 million Yahoo users were likely infected with malicious software, after hackers hijacked some of the companys advertisements, and used them to attack web surfers. According to cyber security firm Fox IT, which reported the breach, some advertisements viewed by clients from December 30 through January 2 were infected with malware. Fox IT estimates that 27,000 Yahoo clients computers were infected every hour over the four-day period: At this time it’s unclear why those countries are most affected, it is likely due to the configuration of the malicious advertisements on Yahoo.
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