> For the complete documentation index, see [llms.txt](https://zwique.gitbook.io/zwique_notes/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://zwique.gitbook.io/zwique_notes/writeups/random-ctf-writeup/local/klaun.md).

# Klaun

## Problem

We're given a RAR archive data v5 file.

{% file src="/files/U4y7vySSC01T1CMfhUG0" %}

I tried to extract using this platform by entering any password to see the result. However, it asked me for a password to download **Klaun.png**. Another file, **Wordlist.txt**, was available for download.

### Bruteforcing Technique

{% stepper %}
{% step %}

### Extracting password hashes from RAR files

rar2john ./Klaun.rar > hash
{% endstep %}

{% step %}

### Cracking the hash using Hashcat

hashcat -a 0 -m 13000 hash Wordlist.txt

{% hint style="info" %}
hash-type(13000) can be found from [sample hashes](https://hashcat.net/wiki/doku.php?id=example_hashes).
{% endhint %}
{% endstep %}
{% endstepper %}

#### Output

```basic
$rar5$16$66b921062f7fbcf42a7c3bb35e127db3$15$1260ae075dd992e9af0d9db82c2e2741$8$613acf0df906e777:goodiegoodie
```

After entering the password, you will be able to get **Klaun.png** file. Use the strings command to get the flag.

```bash
strings Klaun.png
```

`FLAG IS : Y2NzQ1RGe1czTExfRDBOM19NWV9GUjEzTkR9`

Decode it from base64. CyberChef recipe is [here](https://gchq.github.io/CyberChef/#recipe=From_Base64\('A-Za-z0-9%2B/%3D',true,false\)\&input=WTJOelExUkdlMWN6VEV4ZlJEQk9NMTlOV1Y5R1VqRXpUa1I5\&oeol=FF).

```bash
ccsCTF{W3LL_D0N3_MY_FR13ND}
```


---

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