A week long attack has struck Yahoo visitors using malicious ads.
Yahoo has shut down a massive malware campaign that may have affected millions of visitors to its sites.
Yahoo confirmed it had stopped the scheme, which began last week, which had been using Yahoo’s ad network to infect end users PCs with malware. ‘Malvertising’, as it’s known, is an increasingly common technique where an attacker essentially tricks an automated ad network into delivering malware embedded in ads. 
 By Liam Tung for ZDNet