Uchambuzi wa pcap wa DNSCat

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Ikiwa una pcap yenye data inay exfiltrated na DNSCat (bila kutumia usimbaji), unaweza kupata maudhui yaliyotolewa.

Unahitaji tu kujua kwamba bytes 9 za kwanza si data halisi bali zinahusiana na mawasiliano ya C&C:

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)

Kwa maelezo zaidi: https://github.com/jrmdev/ctf-writeups/tree/master/bsidessf-2017/dnscap
https://github.com/iagox86/dnscat2/blob/master/doc/protocol.md

Kuna script inayofanya kazi na Python3: https://github.com/josemlwdf/DNScat-Decoder

python3 dnscat_decoder.py sample.pcap bad_domain

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