AdSense Abused with Malvertising Campaign
Last weekend we noticed a large number of requests to scan websites for malware because they randomly redirected to some “magazine” websites. Most of them mentioned the lemode-mgz .com site. In all cases, the symptoms were the same. Some users randomly got redirected when they clicked on links or loaded new pages. They all reported that the new page would show up for a second or two and then it would redirect them to those magazine websites.
The redirects were platform and browser-agnostic – Windows, Mac, Linux, mobile browsers – they all got redirected. However, while some visitors regularly saw those redirects and even complained that the websites were barely usable because of them, other visitors have never been redirected.
Malvertising is a nasty problem. It’s hard to track. Because of ad targeting (e.g. location, mobile vs desktop, 3G vs Wi-Fi, web browsing history, etc), different users see different ads and different ad campaigns are active in different time. Moreover, one third-party ad network script usually loads content from dozens of other partner networks and trackers behind the scenes. For example, recently we worked with a site whose homepage had scripts from 8 different third-parties (ads and widgets) — when loaded in a browser, that single page generated over a thousand HTTP requests to resources on 249 unique domains — 99% of which belonged to various ad networks and trackers. Maybe this is an extreme example, but requests to 30-40 unique domains initiated by ad script is quite typical.
Despite all this, we have to narrow down malvertising problems to some particular networks or conditions because webmasters are not happy to hear: “remove all ads and the problem will be gone” — they want to find the offending one and either reconfigure it to exclude some certain types of ads or remove only that network from their site, leaving the rest.
Contine to read full article – SOURCE : http://blog.sucuri.net/2015/01/adsense-abused-with-malvertising-campaign.html
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