decrypting smb3 wireshark pcap traffic

https://medium.com/maverislabs/decrypting-smb3-traffic-with-just-a-pcap-absolutely-maybe-712ed23ff6a2

Solution at the last.....

Initial inspection:

filter with smb2 protocol.

Look for packet info column where it is written that, Session Setup Request, NTLMSSP_AUTH, User: JUPITER\Administrator. (domain name\username is variable)

expand the packet. you will get session id: 0x00000000b06d3ffe

and session key: b35056d4bb7f4382ee7aabd0f055bad0

Now navigate to edit > preferences > protocols > smb2 > edit

Now input as follows:

session id:
00000000b06d3ffe

session key:

b35056d4bb7f4382ee7aabd0f055bad0

after clicking OK you may notice that smb3 packets are still encrypted. But in the packets some changes has come.

https://github.com/mlgualtieri/NTLMRawUnHide

git clone https://github.com/mlgualtieri/NTLMRawUnHide.git

python3 NTLMRawUnHide/NTLMRawUnHide.py -i stolen.pcapng

It will recover very quickly NTLMv2 hash.

Now crack this using hashcat or john the ripper.

Now navigate to edit > preferences > protocols > NTLMSSP > put the cracked password in the NT Password field. Now see the packets decrypted or not.

Solution:

https://wiki.samba.org/index.php/Wireshark_Decryption

The other way, is to specify the keytab in Preferences -> Protocols -> KRB5 -> click check mark on "Try to decrypt Kerberos blobs"

Now you should decrypt the smb3 packets.

Avi

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