As if Yahoo hasn't been unlucky enough over the last few months, they've got yet another problem on their hands. Visitors of the search engine were exposed to some vicious adverts over the last few days. These ads were redirected to sites chock-a-block with all sorts of malware, which didn't even require clicking in order to infect users' machines. The countries hit the hardest were European ones, with Romania, Britain and France at the top of the list - luckily for some, those using Macs and mobile devices were not affected.
In a statement made Sunday, Yahoo said: "On Friday, January 3, on our European sites, we served some advertisments that did not meet our editiorial guidelines, specifically, they were designed to spread malware. We promptly removed these advertisments." Later, the press release was modified to include December 31 as the starting point for the malware attack. The company has promised to release further information for its users very soon.