What is the technique used to make my IIS 7 serve all pages with an injected iframe

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http://serverfault.com – Since my previous question was closed without an answer, I'm changing it a bit and asking again. All my pages are being served with an malicious iframe injected just before the html tag. The code looks like this: <iframe src= width=0 height=0></iframe> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http:/ (HowTos)