Respounder

Abstract

1. Introduction

Respounder sends LLMNR name resolution requests for made-up hostnames that do not exist. In a normal non-adversarial network we do not expect such names to resolve. However, a responder, if present in the network, will resolve such queries and therefore will be forced to reveal itself.

A tool that detects presence of a Responder in the network

Identifies compromised machines before hackers run away with the loot (hashes)

2. Objective

Respounder detects presence of responder in the network.

This project demonstrates how Go can be applied to a real-world Cybersecurity & Ethical Hacking problem.

4. Technology Stack

5. System Requirements

General requirements for this technology stack — check the README for exact versions.

• Go 1.20 or later
• Git (to clone the repository)

6. Installation & Setup

git clone https://github.com/codeexpress/respounder.git
cd respounder

$ ./respounder


     .´/
    / (           .----------------.
    [ ]░░░░░░░░░░░|// RESPOUNDER //|
    ) (           '----------------'
    '-'

[wlan0]    Sending probe from 192.168.0.19...   responder not detected
[vmnet1]   Sending probe from 172.16.211.1...   responder not detected
[vmnet8]   Sending probe from 172.16.55.1...    responder detected at 172.16.55.128

Full setup instructions are in the project README.

7. Future Enhancements

Suggested extensions you can add to make this your own project.

• Add logging and alert notifications (email / Telegram)
• Write a threat model document for the tool
• Package it with Docker for safe lab testing

8. Viva / Review Questions

Common questions examiners ask for projects in this domain.

1. Which threat or attack does this project defend against?
2. What detection or protection technique is used and what are its limits?
3. How are false positives and false negatives handled?
4. Which cryptographic algorithms or security standards are involved?
5. What legal and ethical rules apply when testing a tool like this?

9. Source Code & License

This project is developed by codeexpress and published on GitHub under the Apache License 2.0. Please follow the license terms and credit the original author when you use or modify this code.