We’ve just started seeing a hard-core porn invasion on Google Groups. So far, we have identified approximately 270 Google Groups pages with this porn. List here (pdf).
images below, offensive content has been obfuscated.
These pages push other porn pages for profit. While not all of the redirects go to malware sites, we did observe some redirects to a site which ultimately pushes a fake codec trojan, which if installed, results in a VirusHeat infection.
We have alerted Google to the presence of these pages.
Alex Eckelberry
(Thanks, Adam Thomas)