Some advertisements on Yahoo Inc's European websites last week spread malicious software, Yahoo said on Sunday, potentially infecting thousands of users.

On Friday, Fox-IT, a Delft, Netherlands-based computer security firm, wrote in a blog that attackers had inserted malicious ads served by ads.yahoo.com.




In statement on Sunday, a Yahoo spokesman, said: "On Friday, January 3 on our European sites, we served some advertisements that did not meet our editorial guidelines, specifically they spread malware." Yahoo said it promptly removed the bad ads, and that users of Mac computers and mobile devices were not affected.




Malware is software used to disrupt a computer's operations, gather sensitive information, or gain access to private computer systems.


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