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These kinds of back-doors are polymorphic, that is they are designed to look different every time - in practice it's a waste of time trying to decipher them because they all do exactly the same thing. They take external input and they execute it. It might take input from a cookie or a post variable, and it might try and set some PHP options to prevent ...


For intrusion detection you will definitely want to monitor your access.log and error.log files for this web app. I would look out for: Unusually high traffic. Figure out what a normal amount of traffic is based on your access.log and set a monitor to alert you if you suddenly get a much greater amount (e.g. 10 times more requests) that could indicate ...

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