Web Shell Detector

Web Shell Detector – is a php script that helps you find and identify php/cgi(perl)/asp/aspx shells. Web Shell Detector has a “web shells” signature database that helps to identify “web shell” up to 99%. By using the latest javascript and css technologies, web shell detector has a light weight and friendly interface.

Web Shell Detector is released under the MIT License http://www.opensource.org/licenses/mit-license.php

Console version (python): https://github.com/emposha/Shell-Detector

Contributors

Piotr Łuczko

John Thornton

Detection

Number of known shells: 604

Requirements

PHP 5.x, OpenSSL (only for secure file submission)

Usage

To activate Web Shell Detector:

1. Upload shelldetect.php and shelldetect.db to your root directory

2. Open shelldetect.php file in your browser

   Example: http://www.website.com/shelldetect.php

3. Inspect all strange files, if some of files look suspicious, send them to http://www.shelldetector.com team. After submitting your file, it will be inspected and if there are any threats, it will be inserted into a “web shell detector” web shells signature database.

4. If any web shells found and identified use your ftp/ssh client to remove it from your web server (IMPORTANT: please be carefull because some of shells may be integrated into system files!).

Demo

http://www.emposha.com/demo/shelldetect/

Options

• extension - extensions that should be scanned
• showlinenumbers - show line number where suspicious function used
• dateformat - used with access time & modified time
• langauge - if I want to use other language
• directory - scan specific directory
• task - perform different task
• report_format - used with is_cron(true) file format for report file
• is_cron - if true run like a cron(no output)
• filelimit - maximum files to scan (more then 30000 you should scan specific directory)
• useget - activate _GET variable for easy way to recive tasks
• authentication - protect script with user & password in case to disable simply set to NULL
• remotefingerprint - get shells signatures db by remote

Changelog

• 1.66 thanks to John Thornton for small tweeks and php 5.3.3 support

• 1.64 settings ini file support added(in case that you want to use same settings without code changing), output method rewriten, is_cron fixed, italian translation added (thanks to Marco Saiu)

• 1.63 new shell recognize mechanizm added, shell signatures updated.

• 1.62 version of jquery reverted to 1.7.x due bug with jquery ui dialog, new type of files added, shells signatures updated

• 1.61 added new way to send suspicious files, some css & code fixes, new shells signatures added

• 1.6 added support to indicate not shell files (but still those files need to be removed), loader indicator added

• 1.52 noindex meta tag added (to remove script from search results), scann all files options added: extension = *

• 1.51 unpack function update

• 1.5 unpack function added, application version check added, many warnings fixed, error handler fixed.

• 1.4 hide suspicious files option added, file scanning changed.

• 1.3 submission of suspicious file to shelldetector.com changed, email field added with ability to get notify about suspicious file.

• 1.2 encryption function added, authentication added, some small bugs fixed

• 1.1 fingerprint function change show line regex changed

• 1.0 first version