A Google AdSense Trojan horse has been discovered which produces fake Google Ads that look like the original ones. The Trojan shows ads about adult and gambling content which are not supported by the Google AdSense program. However, it also has a bug of showing a text link in place of the Google and Firefox referral image link.

via Tech Shout

The Trojan Horse apparently downloads itself onto an unsuspecting computer through a web page and then replaces the original ads with its own set of malicious ads.

The working of the Ad has a specific procedure. Wherein when the ad is clicked it forwards the user to 3 different sites one after another. What follows next is that the user finally lands himself to a page having a bevy of ads and links to more ads. Through this malicious program advertisers and publishers are the ones who are being deprived of their revenue.