I recently received an email from GWT saying that one of my URL's traffic has suddenly dropped. As it turned out the traffic to the whole site has drastically dropped, from some 300+ unique visitors to less than 10 a day.
After doing some investigation, it turns out that sometimes when you load the website, the source shows only the following:
The cookie is different, for example on one of my computers it said something along the lines of
zzzzzzz=something (can't remember the value) and on a proxy it showed the above value. If the cookie isn't set, it just won't load the website.
Now this obviously means that my website is somehow infected some sort of malware, however, Google doesn't return any search results. Does anyone recognise this malware or can offer some advise on how to find out what the problem is?
Note: the website is a custom written website and although I tried to make it as secure as possible, it obviously seems I might have missed something. Technology used is PHP5 and MySQL.
The URL is: http://ps3theme.net/
EDIT: This only seems to happen the first time round. I did a mass search on the website and nothing was found. If you view the source before you load the website, it comes up, but once that piece of code has been executed, it doesn't come up anymore for a while.