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34 lines
1.2 KiB
Markdown
34 lines
1.2 KiB
Markdown
# DNSCat pcap analise
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{{#include ../../../banners/hacktricks-training.md}}
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As jy 'n pcap het met data wat **deur DNSCat** **uitgelek** word (sonder om versleuteling te gebruik), kan jy die uitgelekte inhoud vind.
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Jy moet net weet dat die **eerste 9 bytes** nie werklike data is nie, maar verband hou met die **C\&C kommunikasie**:
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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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Vir meer inligting: [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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Daar is 'n skrif wat met Python3 werk: [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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