The Dasient Q4 Malware Update reported that more than one million Web sites were infected in the last quarter of 2010. That period saw a 25% growth in malicious advertisements from the previous quarter, as attackers found ways to sneak malicious code into widely used syndicated online ad networks. Security experts see a trend that security experts see accelerating in 2011, as malicious advertisements crop up on high profile sites, such as Autotrader.co.uk, cinema site Myvue.com and londonstockexchange.com.
Source: https://threatpost.com/one-million-web-sites-infected-end-2010-030711/75004/