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One of the Cobalt Strike servers reported by Brad Duncan also communicates over DNS. This can be tested with a simple DNS TXT query:
The content of this TXT record contains the start of a Cobalt Strike beacon, encoded with Netbios Name encoding. I recently published an update to my base64dump.py tool to handle this encoding. In the following video, I show how to use my new, quick & dirty tool to retrieve all DNS TXT records (cs-dns-stager.py) that make up the encoded beacon, and how to decoded this with base64dump and extract the config with my 1768.py tool.
Didier Stevens |
DidierStevens 557 Posts ISC Handler May 30th 2021 |
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May 30th 2021 2 weeks ago |
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