This article is from :

 http://forum.joomla.org/viewtopic.php?f=262&t=795946

This is a notice to all developers / webmasters. Check your site to see if you have any extensions installed from Autson.com AKA iNowWeb.com AKA Plimun.com (possibly more).

Extensions from this developer/company contain malicious code that fetches a file from their server and inserts it into your site. Right now they are inserting hidden backlinks to their Payday L0ans website, which is terrible in itself as this practice can affect YOUR Google rankings, but they also have the ability to insert whatever code they like and do can whatever they like to your website. This is a huge security vulnerability. As such, the extensions have been removed from the JED, but they are still on tens of thousands of websites.