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Captcha Intruder: Captcha Pentesting Tool

Dear leets this tools looks promising. Just have look at its video and see what can be done against website security check point Captchas.

Captcha Intruder is an automatic pentesting tool to bypass captchas.



Code runs on many platforms. It requires Python and the following libraries:

  • python-pycurl – Python bindings to libcurl
  • python-libxml2 – Python bindings for the GNOME XML library
  • python-imaging – Python Imaging Library

On Debian-based systems (ex: Ubuntu), run:

sudo apt-get install python-pycurl python-libxml2 python-imaging


cintruder [OPTIONS]


–version show program’s version number and exit
-h, –help show this help message and exit
-v, –verbose active verbose mode output results
–proxy=PROXY use proxy server (tor: http://localhost:8118)
–track=TRACK download a number of captchas from url (to: ‘inputs/’)
–train=TRAIN apply common OCR techniques to captcha
–crack=CRACK brute force using local dictionary (from: ‘iconset/’)
–xml export result to xml format

Advanced OCR (training):

–set-id=SETIDS set colour’s id manually (use -v for details)
–editor launch an editor to apply image filters

Modules (training):

–list list available modules (from: ‘core/mods/’)
–mod=NAME train using a specific OCR exploiting module

Handlering (cracking):

–tool=COMMAND replace suggested word on commands of another tool. use
‘CINT’ marker like flag (ex: ‘txtCaptcha=CINT’)


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