SMB User Enumeration (SAM EnumUsers) - Metasploit
This page contains detailed information about how to use the auxiliary/scanner/smb/smb_enumusers metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.
Module Overview
Name: SMB User Enumeration (SAM EnumUsers)
Module: auxiliary/scanner/smb/smb_enumusers
Source code: modules/auxiliary/scanner/smb/smb_enumusers.rb
Disclosure date: -
Last modification time: 2020-02-13 11:56:12 +0000
Supported architecture(s): -
Supported platform(s): -
Target service / protocol: microsoft-ds, netbios-ssn
Target network port(s): 139, 445
List of CVEs: -
Determine what local users exist via the SAM RPC service
Module Ranking and Traits
Module Ranking:
- normal: The exploit is otherwise reliable, but depends on a specific version and can't (or doesn't) reliably autodetect. More information about ranking can be found here.
Basic Usage
This module is a scanner module, and is capable of testing against multiple hosts.
msf > use auxiliary/scanner/smb/smb_enumusers
msf auxiliary(smb_enumusers) > show options
... show and set options ...
msf auxiliary(smb_enumusers) > set RHOSTS ip-range
msf auxiliary(smb_enumusers) > exploit
Other examples of setting the RHOSTS option:
Example 1:
msf auxiliary(smb_enumusers) > set RHOSTS 192.168.1.3-192.168.1.200
Example 2:
msf auxiliary(smb_enumusers) > set RHOSTS 192.168.1.1/24
Example 3:
msf auxiliary(smb_enumusers) > set RHOSTS file:/tmp/ip_list.txt
Required Options
- RHOSTS: The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
Knowledge Base
The smb_enumusers
module enumerates users via SAM User Enumeration over the SMB user interface.
This module works against Windows and Samba.
Vulnerable Application
To use smb_enumusers
, make sure you are able to connect to a SMB service that supports SMBv1.
Verification Steps
- Do:
use auxiliary/scanner/smb/smb_enumusers
- Do:
set rhosts [IP]
- Do:
run
Scenarios
Metasploitable2 (Samba)
msf auxiliary(smb_enumusers) > run
[+] 10.9.7.35:139 - METASPLOITABLE [ games, nobody, bind, proxy, syslog, user, www-data, root, news, postgres, bin, mail, distccd, proftpd, dhcp, daemon, sshd, man, lp, mysql, gnats, libuuid, backup, msfadmin, telnetd, sys, klog, postfix, service, list, irc, ftp, tomcat55, sync, uucp ] ( LockoutTries=0 PasswordMin=5 )
Windows 2000 SP4
[+] 10.9.7.127:445 - WIN2K [ disabled, Guest, renamedAdministrator, test ] ( LockoutTries=0 PasswordMin=0 )
Confirmation with nmap
NMAP utilizes smb-enum-users to do SID bruteforcing.
nmap --script smb-enum-users.nse -p445 10.9.7.127,35
Starting Nmap 7.40 ( https://nmap.org ) at 2017-05-19 14:36 EDT
Nmap scan report for 10.9.7.35
Host is up (0.0013s latency).
PORT STATE SERVICE
445/tcp open microsoft-ds
MAC Address: 00:0C:29:59:D4:F7 (VMware)
Host script results:
| smb-enum-users:
| METASPLOITABLE\backup (RID: 1068)
| Full name: backup
| Flags: Account disabled, Normal user account
| METASPLOITABLE\bin (RID: 1004)
| Full name: bin
| Flags: Account disabled, Normal user account
| METASPLOITABLE\bind (RID: 1210)
| Flags: Account disabled, Normal user account
| METASPLOITABLE\daemon (RID: 1002)
| Full name: daemon
| Flags: Account disabled, Normal user account
| METASPLOITABLE\dhcp (RID: 1202)
| Flags: Account disabled, Normal user account
| METASPLOITABLE\distccd (RID: 1222)
| Flags: Account disabled, Normal user account
| METASPLOITABLE\ftp (RID: 1214)
| Flags: Account disabled, Normal user account
...snip...
| METASPLOITABLE\tomcat55 (RID: 1220)
| Flags: Account disabled, Normal user account
| METASPLOITABLE\user (RID: 3002)
| Full name: just a user,111,,
| Flags: Normal user account
| METASPLOITABLE\uucp (RID: 1020)
| Full name: uucp
| Flags: Account disabled, Normal user account
| METASPLOITABLE\www-data (RID: 1066)
| Full name: www-data
|_ Flags: Account disabled, Normal user account
Nmap scan report for win2k (10.9.7.127)
Host is up (0.0013s latency).
PORT STATE SERVICE
445/tcp open microsoft-ds
MAC Address: 00:0C:29:C8:97:2D (VMware)
Host script results:
| smb-enum-users:
| WIN2K\disabled (RID: 1000)
| Full name: disabled
| Description: user account is disabled
| Flags: Account disabled, Normal user account
| WIN2K\Guest (RID: 501)
| Description: Built-in account for guest access to the computer/domain
| Flags: Password not required, Password does not expire, Account disabled, Normal user account
| WIN2K\renamedAdministrator (RID: 500)
| Description: Built-in account for administering the computer/domain
| Flags: Password does not expire, Normal user account
| WIN2K\test (RID: 1001)
| Full name: test
|_ Flags: Normal user account
Nmap done: 2 IP addresses (2 hosts up) scanned in 0.62 seconds
Go back to menu.
Msfconsole Usage
Here is how the scanner/smb/smb_enumusers auxiliary module looks in the msfconsole:
msf6 > use auxiliary/scanner/smb/smb_enumusers
msf6 auxiliary(scanner/smb/smb_enumusers) > show info
Name: SMB User Enumeration (SAM EnumUsers)
Module: auxiliary/scanner/smb/smb_enumusers
License: Metasploit Framework License (BSD)
Rank: Normal
Provided by:
hdm <[email protected]>
Check supported:
No
Basic options:
Name Current Setting Required Description
---- --------------- -------- -----------
DB_ALL_USERS false no Add all enumerated usernames to the database
RHOSTS yes The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
SMBDomain . no The Windows domain to use for authentication
SMBPass no The password for the specified username
SMBUser no The username to authenticate as
THREADS 1 yes The number of concurrent threads (max one per host)
Description:
Determine what local users exist via the SAM RPC service
Module Options
This is a complete list of options available in the scanner/smb/smb_enumusers auxiliary module:
msf6 auxiliary(scanner/smb/smb_enumusers) > show options
Module options (auxiliary/scanner/smb/smb_enumusers):
Name Current Setting Required Description
---- --------------- -------- -----------
DB_ALL_USERS false no Add all enumerated usernames to the database
RHOSTS yes The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
SMBDomain . no The Windows domain to use for authentication
SMBPass no The password for the specified username
SMBUser no The username to authenticate as
THREADS 1 yes The number of concurrent threads (max one per host)
Advanced Options
Here is a complete list of advanced options supported by the scanner/smb/smb_enumusers auxiliary module:
msf6 auxiliary(scanner/smb/smb_enumusers) > show advanced
Module advanced options (auxiliary/scanner/smb/smb_enumusers):
Name Current Setting Required Description
---- --------------- -------- -----------
CHOST no The local client address
CPORT no The local client port
ConnectTimeout 10 yes Maximum number of seconds to establish a TCP connection
DCERPC::ReadTimeout 10 yes The number of seconds to wait for DCERPC responses
NTLM::SendLM true yes Always send the LANMAN response (except when NTLMv2_session is specified)
NTLM::SendNTLM true yes Activate the 'Negotiate NTLM key' flag, indicating the use of NTLM responses
NTLM::SendSPN true yes Send an avp of type SPN in the ntlmv2 client blob, this allows authentication on Windows 7+/Server 2008 R2+ when SPN is required
NTLM::UseLMKey false yes Activate the 'Negotiate Lan Manager Key' flag, using the LM key when the LM response is sent
NTLM::UseNTLM2_session true yes Activate the 'Negotiate NTLM2 key' flag, forcing the use of a NTLMv2_session
NTLM::UseNTLMv2 true yes Use NTLMv2 instead of NTLM2_session when 'Negotiate NTLM2' key is true
Proxies no A proxy chain of format type:host:port[,type:host:port][...]
SMB::AlwaysEncrypt true yes Enforces encryption even if the server does not require it (SMB3.x only). Note that when it is set to false, the SMB client will still encrypt the communication if the server requires it
SMB::ChunkSize 500 yes The chunk size for SMB segments, bigger values will increase speed but break NT 4.0 and SMB signing
SMB::Native_LM Windows 2000 5.0 yes The Native LM to send during authentication
SMB::Native_OS Windows 2000 2195 yes The Native OS to send during authentication
SMB::ProtocolVersion 1,2,3 yes One or a list of coma-separated SMB protocol versions to negotiate (e.g. "1" or "1,2" or "2,3,1")
SMB::VerifySignature false yes Enforces client-side verification of server response signatures
SMBDirect true no The target port is a raw SMB service (not NetBIOS)
SMBName *SMBSERVER yes The NetBIOS hostname (required for port 139 connections)
SSL false no Negotiate SSL/TLS for outgoing connections
SSLCipher no String for SSL cipher - "DHE-RSA-AES256-SHA" or "ADH"
SSLVerifyMode PEER no SSL verification method (Accepted: CLIENT_ONCE, FAIL_IF_NO_PEER_CERT, NONE, PEER)
SSLVersion Auto yes Specify the version of SSL/TLS to be used (Auto, TLS and SSL23 are auto-negotiate) (Accepted: Auto, TLS, SSL23, SSL3, TLS1, TLS1.1, TLS1.2)
ShowProgress true yes Display progress messages during a scan
ShowProgressPercent 10 yes The interval in percent that progress should be shown
VERBOSE false no Enable detailed status messages
WORKSPACE no Specify the workspace for this module
Auxiliary Actions
This is a list of all auxiliary actions that the scanner/smb/smb_enumusers module can do:
msf6 auxiliary(scanner/smb/smb_enumusers) > show actions
Auxiliary actions:
Name Description
---- -----------
Evasion Options
Here is the full list of possible evasion options supported by the scanner/smb/smb_enumusers auxiliary module in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):
msf6 auxiliary(scanner/smb/smb_enumusers) > show evasion
Module evasion options:
Name Current Setting Required Description
---- --------------- -------- -----------
DCERPC::fake_bind_multi false no Use multi-context bind calls
DCERPC::fake_bind_multi_append 0 no Set the number of UUIDs to append the target
DCERPC::fake_bind_multi_prepend 0 no Set the number of UUIDs to prepend before the target
DCERPC::max_frag_size 4096 yes Set the DCERPC packet fragmentation size
DCERPC::smb_pipeio rw no Use a different delivery method for accessing named pipes (Accepted: rw, trans)
SMB::obscure_trans_pipe_level 0 yes Obscure PIPE string in TransNamedPipe (level 0-3)
SMB::pad_data_level 0 yes Place extra padding between headers and data (level 0-3)
SMB::pad_file_level 0 yes Obscure path names used in open/create (level 0-3)
SMB::pipe_evasion false yes Enable segmented read/writes for SMB Pipes
SMB::pipe_read_max_size 1024 yes Maximum buffer size for pipe reads
SMB::pipe_read_min_size 1 yes Minimum buffer size for pipe reads
SMB::pipe_write_max_size 1024 yes Maximum buffer size for pipe writes
SMB::pipe_write_min_size 1 yes Minimum buffer size for pipe writes
TCP::max_send_size 0 no Maxiumum tcp segment size. (0 = disable)
TCP::send_delay 0 no Delays inserted before every send. (0 = disable)
Go back to menu.
Error Messages
This module may fail with the following error messages:
Check for the possible causes from the code snippets below found in the module source code. This can often times help in identifying the root cause of the problem.
Invalid response from the Connect5 request
Here is a relevant code snippet related to the "Invalid response from the Connect5 request" error message:
159:
160: dcerpc.call(62, stub)
161: resp = dcerpc.last_response ? dcerpc.last_response.stub_data : nil
162:
163: if ! (resp and resp.length == 24)
164: print_error("Invalid response from the Connect5 request")
165: disconnect
166: return
167: end
168:
169: phandle = resp[0,20]
Received error <VALUE> from the OpenPolicy2 request
Here is a relevant code snippet related to the "Received error <VALUE> from the OpenPolicy2 request" error message:
173: disconnect
174: return
175: end
176:
177: if(perror != 0)
178: print_error("Received error #{"0x%.8x" % perror} from the OpenPolicy2 request")
179: disconnect
180: return
181: end
182:
183: # EnumDomains
Error: <IP> <E.CLASS> <E>
Here is a relevant code snippet related to the "Error: <IP> <E.CLASS> <E>" error message:
329: raise $!
330: rescue ::Rex::ConnectionError
331: rescue ::Rex::Proto::SMB::Exceptions::LoginError
332: next
333: rescue ::Exception => e
334: print_line("Error: #{ip} #{e.class} #{e}")
335: end
336: end
337: end
338:
339:
Go back to menu.
Related Pull Requests
- #12929 Merged Pull Request: Optionally store enumerated SMB usernames in DB
- #11523 Merged Pull Request: MSF5: Remove unneeded RHOST deregister in scanners
- #8716 Merged Pull Request: Print_Status -> Print_Good (And OCD bits 'n bobs)
- #8338 Merged Pull Request: Fix msf/core and self.class msftidy warnings
- #7615 Merged Pull Request: Print file contents
- #6950 Merged Pull Request: Fix #6948, avoid printing rhost:rport twice when using Msf::Exploit::Remote::SMB::Client
- #6655 Merged Pull Request: use MetasploitModule as a class name
- #6648 Merged Pull Request: Change metasploit class names
- #4768 Merged Pull Request: Reorganize SMB mixins
- #3630 Merged Pull Request: Fix direct datastore assignments to pass msftidy
- #2525 Merged Pull Request: Change module boilerplate
- #1228 Merged Pull Request: MSFTIDY cleanup #1 - auxiliary
Go back to menu.
See Also
Check also the following modules related to this module:
- auxiliary/scanner/snmp/snmp_enumshares
- auxiliary/scanner/smb/smb_enum_gpp
- auxiliary/scanner/smb/smb_enumshares
- auxiliary/scanner/smb/smb_enumusers_domain
- auxiliary/scanner/smb/smb_login
- auxiliary/scanner/smb/smb_lookupsid
- auxiliary/scanner/smb/smb_ms17_010
- auxiliary/scanner/smb/smb_uninit_cred
- auxiliary/scanner/smb/smb_version
- auxiliary/scanner/smb/impacket/dcomexec
- auxiliary/scanner/smb/impacket/secretsdump
- auxiliary/scanner/smb/impacket/wmiexec
- auxiliary/scanner/smb/pipe_auditor
- auxiliary/scanner/smb/pipe_dcerpc_auditor
- auxiliary/scanner/smb/psexec_loggedin_users
- auxiliary/dos/smb/smb_loris
- auxiliary/fuzzers/smb/smb_create_pipe
- auxiliary/fuzzers/smb/smb_create_pipe_corrupt
- auxiliary/fuzzers/smb/smb_negotiate_corrupt
- auxiliary/fuzzers/smb/smb_ntlm1_login_corrupt
- auxiliary/fuzzers/smb/smb_tree_connect
- auxiliary/fuzzers/smb/smb_tree_connect_corrupt
- exploit/windows/smb/smb_delivery
- exploit/windows/smb/smb_doublepulsar_rce
- exploit/windows/smb/smb_relay
- exploit/windows/smb/smb_rras_erraticgopher
- exploit/windows/smb/smb_shadow
- post/linux/busybox/smb_share_root
- auxiliary/scanner/sap/sap_smb_relay
- auxiliary/gather/kerberos_enumusers
- auxiliary/scanner/snmp/snmp_enumusers
- auxiliary/scanner/snmp/xerox_workcentre_enumusers
- auxiliary/scanner/ssh/cerberus_sftp_enumusers
- auxiliary/scanner/ssh/ssh_enumusers
Authors
hdm
Version
This page has been produced using Metasploit Framework version 6.1.27-dev. For more modules, visit the Metasploit Module Library.
Go back to menu.