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#Php code hacked to backdoors to install

The above example suggests a few obvious things to search for in your log file: Search Text htaccess file from a web page! A log line like this is a huge warning flag, and points directly to the file where the backdoor script is hidden.

The referrer (previous page visited) was the same backdoor, which also has a built-in file manager.

Notice the “act”(action)=edit and file=.htaccess.

is the innocently-named file containing the backdoor script.

Here is a good example, from an Apache HTTP log, of a backdoor script in actual use by a hacker, to edit the /public_html/.htaccess file: One way to find these scripts is by searching website access logs for suspicious entries generated when the hacker uses the scripts to modify site files. 1) Detect backdoor scripts by searching website access logs It gives its user a web page interface where they can download and upload, view or modify files, create directories, and otherwise manage the site using PHP’s ability to read and write files and pass operating system commands through to the operating system.īack-doors can be difficult to find because they are usually hidden in files that are already part of the site or uploaded as new files with innocent looking names, often in a directory with many files in it.

#Php code hacked to backdoors to install

When hackers get access to your website, they sometimes install a backdoor shell script designed to allow them to regain entry even after you’ve cleaned up the site, repaired the original security hole that allowed the hack to be successful, otherwise improved site security, and even installed measures to try to lock the hackers out.Ī backdoor script can be called from a browser like any other web page.

If you have time and the interest here’s a method from (this link no longer works) to find the hacker’s script or scripts. If you want to have a go at finding it read on!įor my own sites using WordPress or Joomla I have found it easier to reinstall the software from a known source. Removing unauthorised scripts from your site can be tricky.