Nmap smb-enum-domains NSE Script


This page contains detailed information about how to use the smb-enum-domains NSE script. For list of all NSE scripts, visit the Nmap NSE Library.

Script Overview

Script source code: https://github.com/nmap/nmap/tree/master/scripts/smb-enum-domains.nse
Script categories: discovery, intrusive
Target service / protocol: smb, netbios, tcp, udp
Target network port(s): 137, 139, 445
List of CVEs: -

Script Description

The smb-enum-domains.nse script attempts to enumerate domains on a system, along with their policies. This generally requires credentials, except against Windows 2000. In addition to the actual domain, the "Builtin" domain is generally displayed. Windows returns this in the list of domains, but its policies don't appear to be used anywhere.

Much of the information provided is useful to a penetration tester, because it tells the tester what types of policies to expect. For example, if passwords have a minimum length of 8, the tester can trim his database to match; if the minimum length is 14, the tester will probably start looking for sticky notes on people's monitors.

Another useful piece of information is the password lockouts. A penetration tester often wants to know whether or not there's a risk of negatively impacting a network, and this will indicate it. The SID is displayed, which may be useful in other tools; the users are listed, which uses different functions than smb-enum-users.nse (though likely won't get different results), and the date and time the domain was created may give some insight into its history.

After the initial bind to SAMR, the sequence of calls is:

  • Connect4: get a connect_handle
  • EnumDomains: get a list of the domains (stop here if you just want the names).
  • QueryDomain: get the SID for the domain.
  • OpenDomain: get a handle for each domain.
  • QueryDomainInfo2: get the domain information.
  • QueryDomainUsers: get a list of the users in the domain.

Smb-enum-domains NSE Script Arguments

This is a full list of arguments supported by the smb-enum-domains.nse script:

smbdomain

The domain to log in with. If you aren't in a domain environment, then anything will (should?) be accepted by the server.

smbhash

A password hash to use when logging in. This is given as a single hex string (32 characters) or a pair of hex strings (both 32 characters, optionally separated by a single character). These hashes are the LanMan or NTLM hash of the user's password, and are stored on disk or in memory. They can be retrieved from memory using the fgdump or pwdump tools.

smbnoguest

Use to disable usage of the 'guest' account.

smbpassword

The password to connect with. Be cautious with this, since some servers will lock accounts if the incorrect password is given. Although it's rare that the Administrator account can be locked out, in the off chance that it can, you could get yourself in trouble. To use a blank password, leave this parameter off altogether.

smbtype

The type of SMB authentication to use. These are the possible options:

  • v1: Sends LMv1 and NTLMv1.
  • LMv1: Sends LMv1 only.
  • NTLMv1: Sends NTLMv1 only (default).
  • v2: Sends LMv2 and NTLMv2.
  • LMv2: Sends LMv2 only.
  • NTLMv2: Doesn't exist; the protocol doesn't support NTLMv2 alone. The default, NTLMv1, is a pretty decent compromise between security and compatibility. If you are paranoid, you might want to use v2 or lmv2 for this. (Actually, if you're paranoid, you should be avoiding this protocol altogether!). If you're using an extremely old system, you might need to set this to v1 or lm, which are less secure but more compatible. For information, see smbauth.lua.

smbusername

The SMB username to log in with. The forms "DOMAIN\username" and "username@DOMAIN" are not understood. To set a domain, use the smbdomain argument.

randomseed

Set to a value to change the filenames/service names that are randomly generated.

smbbasic

Forces the authentication to use basic security, as opposed to "extended security". Against most modern systems, extended security should work, but there may be cases where you want to force basic. There's a chance that you'll get better results for enumerating users if you turn on basic authentication.

smbport

Override the default port choice. If smbport is open, it's used. It's assumed to be the same protocol as port 445, not port 139. Since it probably isn't possible to change Windows' ports normally, this is mostly useful if you're bouncing through a relay or something.

smbsign

Controls whether or not server signatures are checked in SMB packets. By default, on Windows, server signatures aren't enabled or required. By default, this library will always sign packets if it knows how, and will check signatures if the server says to. Possible values are:

  • force: Always check server signatures, even if server says it doesn't support them (will Probably fail, but is technically more secure).
  • negotiate: [default] Use signatures if server supports them.
  • ignore: Never check server signatures. Not recommended.
  • disable: Don't send signatures, at all, and don't check the server's. not recommended. More information on signatures can be found in smbauth.lua.

- - -
To use these script arguments, add them to the Nmap command line using the --script-args arg1=value,[arg2=value,..] syntax. For example:

nmap --script=smb-enum-domains --script-args smbdomain=value,smbhash=value <target>

Smb-enum-domains NSE Script Example Usage

Here's an example of how to use the smb-enum-domains.nse script:

nmap --script smb-enum-domains.nse -p445 <host>

sudo nmap -sU -sS --script smb-enum-domains.nse -p U:137,T:139 <host>

Smb-enum-domains NSE Script Example Output

Here's a sample output from the smb-enum-domains.nse script:

Host script results:
| smb-enum-domains:
|   WINDOWS2000
|     Groups: n/a
|     Users: Administrator, blah, Guest, testpass, ron, test, user
|     Creation time: 2009-10-17 12:45:47
|     Passwords: min length: n/a; min age: 5 days; max age: 100 days; history: 10 passwords
|     Properties: Complexity requirements exist
|     Account lockout: 5 attempts in 30 minutes will lock out the account for 30 minutes
|   Builtin
|     Groups: Administrators, Backup Operators, Guests, Power Users, Replicator, Users
|     Users: n/a
|     Creation time: 2009-10-17 12:45:46
|     Passwords: min length: n/a; min age: n/a days; max age: 42 days; history: n/a passwords
|_    Account lockout disabled

Smb-enum-domains NSE Script Example XML Output

There is no sample XML output for this module. However, by providing the -oX <file> option, Nmap will produce a XML output and save it in the file.xml file.

Author

  • Ron Bowes

References

See Also

Related NSE scripts to the smb-enum-domains.nse script:

Visit Nmap NSE Library for more scripts.

Version

This page has been created based on Nmap version 7.92.