Over the past month a number of websites, including TweakTown, have experienced sporadic redirects to scam websites. It has been exceptionally difficult to track down the source of these redirects, and our team has been working tirelessly to isolate the source of the issue. The source of the issue appears to be malicious code injected into Google Adsense ads, which are used by websites around the world.
The malicious redirect worked even in the Ad Review Center of the Google AdSense dashboard on Google.com site where webmasters may view ads that Google displays on their sites. This problem existed for about a month since the second half of December 2014, but became really widespread last Friday (Jan 9th 2015). By the end of the weekend, Google seemed to have been able to mitigate it.
While there may be notably reduced frequency to the malicious ads, they are still circulating. We have noticed these redirects are still present on other websites as well during the last few days. Google Adsense works by targeting specific ads to a specific viewers. This type of maddening attack, referred to as Malvertising, is hard to track because different users view different ads. The redirects are landing users on pages that appear legitimate, such as a fake Forbes website, but are all contained in different subdirectoriess of lemode-mgz.com, consumernews247.com, and wan-tracker.com.
Frankly, its surprising that Google was able to be exploited on such a large scale. Perhaps the policy of allowing code in their ads that can be easily modified for nefarious purposes should be reviewed.
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