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I like taking a closer look at captures files posted by Brad. In his latest diary entry, we have a capture file with Cobalt Strike traffic. With regular expression "^/....$" I look for URIs that are typical for Cobalt Strike shellcode (and Metasploit too):
Following this HTTP stream, I see data that looks encoded and has some repetitions, so this might be some kind of XOR encoding:
I export this data stream as a file:
Then pass it through my 1768.py Cobalt Strike beacon analysis tool:
And this is indeed the configuration of a beacon. Didier Stevens |
DidierStevens 575 Posts ISC Handler Mar 7th 2021 |
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Mar 7th 2021 6 months ago |
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