21 July 2014 | 2,296 views

clipcaptcha – CAPTCHA Service Impersonation Tool

Cyber Raptors Hunting Your Data?

clipcaptcha is an extensible and signature based CAPTCHA Provider impersonation tool based off Moxie Marlinspike’s sslstrip codebase, which we mentioned back in 2009 – SSLstrip – HTTPS Stripping Attack Tool.

Depending on its mode of operation it may approve, reject or forward the CAPTCHA verification requests. It maintains an easy to edit XML configuration file that it queries to identify CAPTCHA provider request formats and render corresponding responses.

clipcaptcha - CAPTCHA Service Impersonation Tool

Signature based CAPTCHA provider detection

All CAPTCHA providers are basically HTTP based custom web services. These services accept CAPTCHA validation requests in a particular format and respond with finite set of responses that allow the clients to make Boolean choices to allow or disallow the request. clipcaptcha takes advantage of this finite and predictable request and response data set to implement signature based request detection and response system.

Running clipcaptcha

The four steps to getting this working on Linux are:

1. Enable forwarding mode on your machine

2. Setup iptables to redirect HTTP traffic to clipcaptcha.

3. Run arpspoof to redirect the traffic to your machine.

4. Run clipcaptcha in one of its mode of operation.


It requires Python 2.5 or newer, along with the ‘twisted’ python module.

You can download clipcaptcha here:


Or read more here.


Recent in Hacking Tools:
- american fuzzy lop – Security Oriented Fuzzing Tool
- KeeFarce – Extract KeePass Passwords (2.x) From Database
- 0d1n – Web HTTP Fuzzing Tool

Related Posts:
- CAPTCHA – Safer and better looking
- InsomniaShell – ASP.NET Reverse Shell Or Bind Shell
- 13 Out Of 15 Popular CAPTCHA Schemes Vulnerable To Automated Attacks

Most Read in Hacking Tools:
- Top 15 Security/Hacking Tools & Utilities - 1,940,108 views
- Brutus Password Cracker – Download brutus-aet2.zip AET2 - 1,276,191 views
- wwwhack 1.9 – Download wwwhack19.zip Web Hacking Tool - 659,074 views

Advertise on Darknet

Comments are closed.