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PHP c99shell Backdoor Script Detection



The remote web server may contain a PHP backdoor script.


The remote web server may contain a PHP script that acts as a backdoor and provides a convenient set of tools for attacking the affected host. At least one instance of 'c99shell' (or a derivative, such as c100 or Locus7Shell) is hosted on the remote web server.


Remove any instances of the script and conduct a forensic examination to determine how it was installed as well as whether other unauthorized changes were made.