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🧵 (1/) Bypassing IDS DCSync Signature for #secretsdump
I’ve been asked lately to bypass a private IDS rule for #impacket’s DCSync operation and I’ve immediately remembered this Charlie’s question ⬇️
I’ve been asked lately to bypass a private IDS rule for #impacket’s DCSync operation and I’ve immediately remembered this Charlie’s question ⬇️
🧵 (2/) The rule triggers when a bunch of SMB requests are followed by all this DRSUAPI stuff. Unlike #mimikatz or #DSInternals DCSync, the sequence of SMB+DRSUAPI traffic is unique for secretsdump[.]py attack, thus it becomes an IOC and can be fingerprinted ⬇️ 
🧵 (3/) The second series of the SMB requests is related to the RemoteOperations.connectSamr() call in the NTDSHashes class which is only needed to verify that’s out target is actually a DC, so it can be excluded from the attack with no consequences ⬇️
