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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:
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
There is a script that works with Python3: https://github.com/josemlwdf/DNScat-Decoder
python3 dnscat_decoder.py sample.pcap bad_domain
Learn AWS hacking from zero to hero with htARTE (HackTricks AWS Red Team Expert)!
Other ways to support HackTricks:
- If you want to see your company advertised in HackTricks or download HackTricks in PDF Check the SUBSCRIPTION PLANS!
- Get the official PEASS & HackTricks swag
- Discover The PEASS Family, our collection of exclusive NFTs
- Join the 💬 Discord group or the telegram group or follow me on Twitter 🐦 @carlospolopm.
- Share your hacking tricks by submitting PRs to the HackTricks and HackTricks Cloud github repos.