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This is a short follow up on my post about hacked sites that poisoned Google Image search results.
As I mentioned in that post, most compromised sites where hackers created malicious doorway pages, contained one of the following images or iframes in their legitimate index pages.
This investigation began a few weeks ago, when I came across the following two threads in website security forums:
[badwarebusters.org] Lately I have been seeing a huge increase in the number of hacked sites appearing on google image search results that redirect to a fake Av scanner. more »»
[Google Webmaster Help] google image search results often has multiple infected / malware sites on the first SERP page. more »»
This is a well known problem. I blogged about such SEO poisoning attacks several times here. This time I decided to check what’s behind the reported increase in malicious image search results.