InToSEO

From: http://jensense.com/
It was only a matter of time before a trojan or virus targeted AdSense or YPM for malicious activity, and the time has come. A new trojan horse discovered by an Indian publisher replaces Google AdSense ads with their own ads, advertising sites including dating, sex, viagra and weight loss. This trojan is very recent, because it not only converts regular AdSense ad units, but also the Google AdSense and Firefox referrer buttons into text links.
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