Hi,
I have a pcap file with smb traffic and I am trying to understand how the signature is generated.
Using wireshark GUI, I have opened the pcap file and have put a filter, so that I can see the relevant tcp stream only.
In this stream, the initial authentication is done using NTLMSSP.
But, after nearly 100 smb packets, suddenly I see a SetupAndX Request/Response, with krb5 AP_REQ and AP_REP.
I have used the keytab file to decrypt the AP_REP and get the session key.
Now, the sequence number starts with 0 and I have used that counter to calculate the signature.
But, the signature that I am getting doesn't match with the original signature.
I also, tried to count the sequence number starting from the NTLM Request/Response and with that also, the signature doesn't match.
So, can somebody tell me, if this kind of mixup of NTLM and kerberos packets in a single tcp stream is common?
And how to get the right signature in this case?
