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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
HackTricks in 🐦 Twitter 🐦 - 🎙️ Twitch Wed - 18.30(UTC) 🎙️ - 🎥 Youtube 🎥
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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!
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