Nmap smb-double-pulsar-backdoor NSE Script


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

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Script Overview

Script source code: https://github.com/nmap/nmap/tree/master/scripts/smb-double-pulsar-backdoor.nse
Script categories: vuln, safe, malware
Target service / protocol: smb, netbios, tcp, udp
Target network port(s): 137, 139, 445
List of CVEs: CVE-2010-2550

Script Description

The smb-double-pulsar-backdoor.nse script checks if the target machine is running the Double Pulsar SMB backdoor.

Based on the python detection script by Luke Jennings of Countercept.

Smb-double-pulsar-backdoor NSE Script Arguments

This is a full list of arguments supported by the smb-double-pulsar-backdoor.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.

vulns.short

If set, vulnerabilities will be output in short format, a single line consisting of the host's target name or IP, the state, and either the CVE ID or the title of the vulnerability. Does not affect XML output.

vulns.showall

If set, the library will show and report all the registered vulnerabilities which includes the NOT VULNERABLE ones. By default the library will only report the VULNERABLE entries: VULNERABLE, LIKELY VULNERABLE, VULNERABLE (DoS) and VULNERABLE (Exploitable). This argument affects the following functions: vulns.Report.make_output(): the default output function for portule/hostrule scripts. vulns.make_output(): the default output function for postrule scripts. vulns.format_vuln() and vulns.format_vuln_table() functions.

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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-double-pulsar-backdoor --script-args smbdomain=value,smbhash=value <target>

Smb-double-pulsar-backdoor NSE Script Example Usage

Here's an example of how to use the smb-double-pulsar-backdoor.nse script:

nmap -p 445 <target> --script=smb-double-pulsar-backdoor

Smb-double-pulsar-backdoor NSE Script Example Output

Here's a sample output from the smb-double-pulsar-backdoor.nse script:

| smb-double-pulsar-backdoor:
|   VULNERABLE:
|   Double Pulsar SMB Backdoor
|     State: VULNERABLE
|     Risk factor: HIGH  CVSSv2: 10.0 (HIGH) (AV:N/AC:L/Au:N/C:C/I:C/A:C)
|       The Double Pulsar SMB backdoor was detected running on the remote machine.
|
|     Disclosure date: 2017-04-14
|     References:
|       https://isc.sans.edu/forums/diary/Detecting+SMB+Covert+Channel+Double+Pulsar/22312/
|       https://github.com/countercept/doublepulsar-detection-script
|_      https://steemit.com/shadowbrokers/@theshadowbrokers/lost-in-translation

Smb-double-pulsar-backdoor 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

  • Andrew Orr

References

See Also

Related NSE scripts to the smb-double-pulsar-backdoor.nse script:

Visit Nmap NSE Library for more scripts.

The smb-double-pulsar-backdoor.nse script may fail with the following error messages. Check for the possible causes by using the code snippets highlighted below found in the script source code. This can often times help in identifying the root cause of the problem.

Could not connect to IPC$ share over SMB.

Here is a relevant code snippet related to the "Could not connect to IPC$ share over SMB." error message:

119:	  local share = "IPC$"
120:	
121:	  local status, smbstate = smb.start_ex(host, true, true, share, nil, nil, nil)
122:	
123:	  if not status then
124:	    stdnse.debug1("Could not connect to IPC$ share over SMB.")
125:	  else
126:	    -- the multiplex ID needs to be 65
127:	    smbstate["mid"] = 65;
128:	    -- 12 (not 11, not 13) nulls
129:	    local param = ("\0"):rep(12)

Version

This page has been created based on Nmap version 7.92.

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