# DNSCat pcap analysis

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If you have pcap with data being **exfiltrated by DNSCat** (without using encryption), you can find the exfiltrated content.

You only need to know that the **first 9 bytes** are not real data but are related to the **C\&C communication**:

```python
from scapy.all import rdpcap, DNSQR, DNSRR
import struct 

f = ""
last = ""
for p in rdpcap('ch21.pcap'):
	if p.haslayer(DNSQR) and not p.haslayer(DNSRR):

		qry = p[DNSQR].qname.replace(".jz-n-bs.local.","").strip().split(".")
		qry = ''.join(_.decode('hex') for _ in qry)[9:]
		if last != qry:
			print(qry)
			f += qry
		last = qry

#print(f)
```

For more information: <https://github.com/jrmdev/ctf-writeups/tree/master/bsidessf-2017/dnscap>\
<https://github.com/iagox86/dnscat2/blob/master/doc/protocol.md>

<details>

<summary>📝<a href="https://www.twitch.tv/hacktricks_live/schedule"> </a><mark style="color:blue;"><strong>Breached Write Content</strong></mark><strong> Wednesdays</strong></summary>

* Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access to the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
* Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
* Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
* **Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/carlospolopm)**.**
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</details>


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