Network Solutions and WordPress Security Flaw

I first noticed this hidden iframe from hxxp://networkads .net/ grep/ on April 7. It instantly drew my attention with these weird “iframe_style” scripts in Unmask Parasites reports (I even thought it was a bug in Unmask Parasites, but when I checked the infected site, I found those scripts there).

However it was a single incident and I didn’t see any obvious pattern back then. Two days later, when I noticed David’s (Sucuri Security) article about this very issue and the follow-up by Brian Krebs, I decided to take a closer look at it. What I found is quite interesting and raises a few serious questions about security of websites on shared servers.
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