Yahoo Shuts Down Malware Attack After Hackers Used Its Ad Network For A Week To Infect Users' Computers

Yahoo on Monday shut down a cyber hack attack that exploited the company's ad network for a full week to deliver malware directly to the computers of users who visited the company's websites, the cyber security firm that discovered the attack said this week. Yahoo did not reveal how many users were affected, but it could be substantial, given that Yahoo gets 6.9 billion visits a month.