In the last three months of 2010 attackers managed to serve 3 million malicious advertising, or malvertising, impressions every day. Dasient report says that’s a 100 percent increase from the preceding quarter. Part of the increase may be attributed to Dasient increasing the types of ad networks it tracks. The London Stock Exchange attack also points to another troubling trend in malicious advertising attacks: rather than infiltrate them, criminals are simply buying the ad space needed to propagate their attacks. Because of their ease of execution and effectiveness at reaching a broad audience, these attacks aren’t expected to stop soon.”]
Source: https://www.csoonline.com/article/2127572/malvertising-continues-to-pound-legitimate-web-sites.html