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34 lines
1.2 KiB
Markdown
34 lines
1.2 KiB
Markdown
# Analisi pcap di DNSCat
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{{#include ../../../banners/hacktricks-training.md}}
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Se hai un pcap con dati **esfiltrati da DNSCat** (senza utilizzare la crittografia), puoi trovare il contenuto esfiltrato.
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Devi solo sapere che i **primi 9 byte** non sono dati reali ma sono correlati alla **comunicazione C\&C**:
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```python
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from scapy.all import rdpcap, DNSQR, DNSRR
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import struct
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f = ""
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last = ""
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for p in rdpcap('ch21.pcap'):
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if p.haslayer(DNSQR) and not p.haslayer(DNSRR):
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qry = p[DNSQR].qname.replace(".jz-n-bs.local.","").strip().split(".")
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qry = ''.join(_.decode('hex') for _ in qry)[9:]
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if last != qry:
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print(qry)
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f += qry
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last = qry
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#print(f)
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```
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Per ulteriori informazioni: [https://github.com/jrmdev/ctf-writeups/tree/master/bsidessf-2017/dnscap](https://github.com/jrmdev/ctf-writeups/tree/master/bsidessf-2017/dnscap)\
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[https://github.com/iagox86/dnscat2/blob/master/doc/protocol.md](https://github.com/iagox86/dnscat2/blob/master/doc/protocol.md)
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C'è uno script che funziona con Python3: [https://github.com/josemlwdf/DNScat-Decoder](https://github.com/josemlwdf/DNScat-Decoder)
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```
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python3 dnscat_decoder.py sample.pcap bad_domain
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```
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{{#include ../../../banners/hacktricks-training.md}}
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