I noticed I had a problem with one of my blogs that was Number3 in google and was getting good traffic and then suddenly got 4 positions down. I thought it was weird because it has been there for a long time so I typed the url in my navigation tab and when the blog was supposed to appear, I got a warning (I was using google chrome).
It was something like: The website xyz.com appears to contain elements from the website estguard.com that apparently hosts malware....
So I went back to my blog and had a look at the source code. And here come the surprise:
There was a code at the bottom of every page after the </html> tag.
This is the code:
I deleted the code for security purposes.
It looks like it's a java script that tries to install something using an iframe. It was causing google not to trust my blog anymore and thus the drop in the search engine results.
So I went ahead and had a look all my other blogs. Guess what? All of them were infected except the ones with wp 2.9.1.
So this seemed to be the solution. So I upgraded all my blogs and the problem was solved.
So if you encounter the same prolem, you know what to do.
Please share, if you had a similar experience/ if you know what is the real problem (maybe it's the server that got infected infected ).