Also, have you run the scans for the Grumblar virus? Maybe it's your computer that's infected and that is uploading the information to the server (we've see a lot of this).
Check out this article, and the link at the bottom of the article to get a free tool to remove any trojans or keyloggers. It's what I use on a DAILY basis on my own computers;
http://billing.handsonwebhosting.com/knowledgebase.php?action=displayarticle&id=220