Quick Creds with Responder and Kali Linux

Tool website: https://github.com/lgandx/Responder
Tool Author: Laurent Gaffie

Responder is a powerful tool for quickly gaining credentials and possibly even remote system access. It is a LLMNR, NBT-NS & MDNS poisoner that is easy to use and very effective against vulnerable networks.

For the last few years one of the favorite tools in the pentester’s toolbox has been Responder. Responder works by imitating several services and offering them to the network. Once a Windows system is tricked into communicating to responder via one of these services or when an incorrect UNC share name is searched for on the LAN, responder will respond to the request, grab the username & password hash and log them. Responder has the ability to prompt users for credentials when certain network services are requested, resulting in clear text passwords. It can also perform pass-the-hash style attacks and provide remote shells.

In this article we will see how to use Responder in Kali Linux. In the next article we will dig a little deeper and look at some of the additional tools that are included with Responder.

Basic Usage

Responder is installed by default in Kali Linux. To view the Responder help screen and see what options are available, just use the “-h” switch.

Kali Linux Responder 1

From the help screen, the usage is:

responder -I eth0 -w -r -f


responder -I eth0 -wrf

So, basically run the program, provide your network interface with the “-I” switch and then any other switches that you want. You can combine the switches together if you wish, as shown in the second usage example above. You can also use the verbose switch, “-v” to increase the text output of the program for more formation.

Analyze mode

A good place to start is “Analyze mode”. This mode runs responder but it does not respond to requests. It is specified with the “-A” switch. This can be handy to see what types of requests on the network responder could respond to, without actually doing it.

Kali Linux Responder 2

Any events will be shown on the screen, as below:

Kali Linux Responder 3

Analyze mode is also a good way to passively discover possible target systems.

Enough intro, let’s see Responder in action.

Poisoning with Responder

You can start Responder with the basic poisoner defaults by just typing:

responder -I eth0

Kali Linux Responder 4

Responder will poison responses and, if it can, capture any credentials. If a user tries to connect to a non-existing server share, Responder will answer the request and prompt them with a login prompt for access. If they enter their credentials, Responder will display and save the password hash:

Kali Linux Responder 5

We could then take the hash and attempt to crack it.

Basic Authentication & WPAD

WPAD is used in some corporate environments to automatically provide the Internet proxy for web browsers. Many Internet browsers have “enable system proxy” set by default in their internet settings, so they will seek out a WPAD server for a proxy address.

We can enable WPAD support in Responder to have it respond to these requests. If we use WPAD with the “Force Basic Authentication” option, Responder prompts users with a login screen when they try to surf the web and grabs the entered creds in clear text.


Responder -I eth0 -wbF

  • -w” Starts the WPAD Server
  • -b” Enables basic HTTP authentication
  • -F” Forces authentication for WPAD (a login prompt)

Kali Linux Responder 6

When a user goes to surf the web, the browser will reach out for proxy settings using WPAD. Responder will respond to the request and trigger a login prompt:

Kali Linux Responder 7

If the user enters their credentials, you get a copy of them in clear text. No cracking needed!

Kali Linux Responder 8

As you can see in the picture above, the user “Joe User” is using the password, “SuperSecurePassword”, which it isn’t.  🙂

Log Files

Log files for Responder are located in the /usr/share/responder/logs directory:

Kali Linux Responder 9

Along with the regular program log files, any credentials recovered will be stored in a file that includes the IP address of the target. You can view these files to see the hash or clear text creds:

Kali Linux Responder 10

If only the password hashes were recovered you can take the hash file and use it directly with your favorite cracking program:

john [responder password hash file]

Kali Linux Responder 11

Obviously, this is just an example as corporate networks should never allow “12345” as a password. But sadly enough, I have seen companies remove password complexity requirements so users could continue to use simple passwords.


In this article we saw how easy it is to use Responder to obtain both clear text and password hashes. How would you defend against this tool?

Basic Network Security Monitoring (NSM) will pick up and flag Basic plain text authentication attempts and WPAD auto-proxy requests. This is just one reason why NSM is so important.

You can disable the services that Responder is taking advantage of, but you must be sure that this will not affect your network functionality before you do, especially in environments with old systems still running.

For WPAD based attacks, provide an entry for WPAD in DNS, or don’t use the “system proxy” setting in the browser. In the next article, we will look at some of the extra tools included with Responder.

Also, check out my new book that has an entire chapter on Responder & Multi-Relay – “Basic Security Testing with Kali Linux, 3rd Edition“!



New Version of Kali Linux (1.1.0) Released!

Kali Linux 110

After two years of development, a new version of Kali Linux is available! Version 1.1.0 of Kali Linux, arguably the greatest penetration testing platform available, is now ready for download.

The update contains a slew of system updates and fixes, plus some new wallpapers and it seemed even some new Metasploit splash screens.

If you already have Kali Installed, just:

  • apt-get update
  • apt-get dist-upgrade

VMWare images of 1.1.0 are available at Offensive Security.

Check it out!

If you are new to Kali Linux, or a veteran that wants to learn more, check out my step by step, How-To book, “Basic Security Testing with Kali Linux” on Amazon.com.

Upcoming Book, “Basic Security Testing with Kali”

This month’s issue of PenTest Magazine is out. This issue focuses exclusively on Kali Linux.

And in it you will find an exclusive interview about my upcoming book, “Basic Security Testing with Kali“!

I have been using Backtrack/ Kali for quite a long time now.

Over the years, I have helped out with several books and training classes on Backtrack/ Kali.

And answered a ton of user questions about the penetration testing platform and the included tools.

Seeing the interest (and being asked about it several times 🙂 ), I am writing this book to help both new and experienced users. The book will be geared to beginner to intermediate level users of Kali and will cover a lot of topics including:

  • Reconnaissance and Exploitation of hosts
  • Social Engineering
  • Wi-Fi Attacks
  • Kali on the Raspberry Pi

I am planning on releasing the book to Amazon when it is finished. I want to take the time needed to make sure it is done right, and it will be released as soon as it is done.

Thanks to everyone for their support and encouragement for this project, I truly appreciate it!

Backtrack 5 r3 List of (some of the) new Tools and Programs

What are the new utilities included with Backtrack 5r3? I couldn’t find a list, so I decided to make one myself comparing BT5r2 with the latest version. This is not an exhaustive list, but hopefully it will help people see some of the very cool new tools and programs added to Backtrack.

I listed the program name and tried to give a short description of what it does. If I screwed any up, please let me know!

Identify Live Hosts:

  • dnmap – Distributed NMap
  • address6 (The Second “Alive6” entry) – IPV6 address conversion

Information Gathering Analysis

  • Jigsaw – Grabs information about company employees
  • Uberharvest – E-mail harvester
  • sslcaudit – SSL Cert audit
  • VoIP honey – VoIP Honeypot
  • urlcrazy – Detects URL typos used in typo squatting, url hijacking, phishing

Web Crawlers

  • Apache_users – Apache username enumerator
  • Deblaze – Performs enumeration & interrogation against Flash remote end points

Database Analysis

  • Tnscmd10g – Allows you to inject commands into Oracle
  • BBQSQL – Blind SQL injection toolkit

Bluetooth Analysis

  • Blueranger – Uses link quality to locate Bluetooth devices

Vulnerability Assesment

  • Lynis – Scans systems & software for security issues
  • DotDotPwn – Directory Traversal fuzzer

Exploitation Tools

  • Netgear-telnetable – Enables Telnet console on Netgear devices
  • Termineter – Smart Meter tester
  • Htexploit – Tool to bypass standard directory protection
  • Jboss-Autopwn – Deploys JSP shell on target JBoss servers
  • Websploit – Scans & analyses remote systems for vulnerabilities

Wireless Exploitation Tools

  • Bluepot – Bluetooth honeypot
  • Spooftooph – Spoofs or clones Bluetooth devices
  • Smartphone-Pentest-Framework
  • Fern-Wifi-cracker – Gui for testing Wireless encryption strength
  • Wi-fihoney – Creates fake APs using all encryption and monitors with Airodump
  • Wifite – Automated wireless auditor

A Bunch of Password Tools

  • Creddump
  • Johnny
  • Manglefizz
  • Ophcrack
  • Phrasendresher
  • Rainbowcrack
  • Acccheck
  • smbexec

And let’s not forget “Subterfuge” the MiTM Framework, and new Arduino support.

Okay, that is not ALL of the new additions, only a chunk of them! I believe last count there are around 60 new tools in the Backtrack 5r3 release.

But why use Backtrack 5 when you can use the latest Backtrack called Kali Linux!

Want to learn more about Backtrack/ Kali Linux?

My new book, “Basic Security Testing with Kali Linux” shows how to use many of the tools and programs in Backtrack/ Kali Linux using hands on step-by-step tutorials. Check it out!

You can also download the latest version of Backtrack/ Kali here.