hacktricks/forensics/basic-forensic-methodology/pcap-inspection/dnscat-exfiltration.md

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<details>
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If you have pcap with data being **exfiltrated by DNSCat** (without using encryption), you can find the exfiltrated content.
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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/jrmdev/ctf-writeups/tree/master/bsidessf-2017/dnscap)\
[https://github.com/iagox86/dnscat2/blob/master/doc/protocol.md](https://github.com/iagox86/dnscat2/blob/master/doc/protocol.md)
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2022-05-01 16:32:23 +00:00
2022-04-28 16:01:33 +00:00
<details>
<summary><strong>Support HackTricks and get benefits!</strong></summary>
2022-09-09 11:28:04 +00:00
- 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)!
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- Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
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- Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
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- **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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- **Share your hacking tricks by submitting PRs to the** [**hacktricks github repo**](https://github.com/carlospolop/hacktricks)**.**
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</details>
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