NBT-NS/LLMNR Responder Laurent Gaffie lgaffie@trustwave.com http://www.spiderlabs.com

INTRODUCTION

This tool is first an LLMNR, NBT-NS and MDNS responder, it will answer to specific NBT-NS (NetBIOS Name Service) queries based on their name suffix (see: http://support.microsoft.com/kb/163409). By default, the tool will only answers to File Server Service request, which is for SMB. The concept behind this, is to target our answers, and be stealthier on the network. This also helps to ensure that we don't break legitimate NBT-NS behavior. You can set the -r option via command line if you want this tool to answer to the Workstation Service request name suffix.

FEATURES

Built-in SMB Auth server. Supports NTLMv1, NTLMv2 hashes with Extended Security NTLMSSP by default. Successfully tested from Windows 95 to Server 2012 RC, Samba and Mac OSX Lion. Clear text password is supported for NT4, and LM hashing downgrade when the --lm option is set. This functionality is enabled by default when the tool is launched.
Built-in MSSQL Auth server. In order to redirect SQL Authentication to this tool, you will need to set the option -r (NBT-NS queries for SQL Server lookup are using the Workstation Service name suffix) for systems older than windows Vista (LLMNR will be used for Vista and higher). This server supports NTLMv1, LMv2 hashes. This functionality was successfully tested on Windows SQL Server 2005 & 2008.
Built-in HTTP Auth server. In order to redirect HTTP Authentication to this tool, you will need to set the option -r for Windows version older than Vista (NBT-NS queries for HTTP server lookup are sent using the Workstation Service name suffix). For Vista and higher, LLMNR will be used. This server supports NTLMv1, NTLMv2 hashes and Basic Authentication. This server was successfully tested on IE 6 to IE 10, Firefox, Chrome, Safari. Note: This module also works for WebDav NTLM authentication issued from Windows WebDav clients (WebClient). You can now send your custom files to a victim.
Built-in HTTPS Auth server. In order to redirect HTTPS Authentication to this tool, you will need to set the -r option for Windows versions older than Vista (NBT-NS queries for HTTP server lookups are sent using the Workstation Service name suffix). For Vista and higher, LLMNR will be used. This server supports NTLMv1, NTLMv2, and Basic Authentication. This server was successfully tested on IE 6 to IE 10, Firefox, Chrome, and Safari. The folder Cert/ was added and contain 2 default keys, including a dummy private key. This is intentional, the purpose is to have Responder working out of the box. A script was added in case you need to generate your own self signed key pair.
Built-in LDAP Auth server. In order to redirect LDAP Authentication to this tool, you will need to set the option -r for Windows version older than Vista (NBT-NS queries for HTTP server lookup are sent using the Workstation Service name suffix). For Vista and higher, LLMNR will be used. This server supports NTLMSSP hashes and Simple Authentication (clear text authentication). This server was successfully tested on Windows Support tool "ldp" and LdapAdmin.
Built-in FTP Auth server. This module will collect FTP clear text credentials.
Built-in small DNS server. This server will answer type A queries. This is really handy when it's combined with ARP spoofing.
All hashes are printed to stdout and dumped in an unique file John Jumbo compliant, using this format: (SMB or MSSQL or HTTP)-(ntlm-v1 or v2 or clear-text)-Client_IP.txt The file will be located in the current folder.
Responder will logs all its activity to a file Responder-Session.log.
When the option -f is set to "On", Responder will fingerprint every host who issued an LLMNR/NBT-NS query. All capture modules still work while in fingerprint mode.
Browser Listener finds the PDC in stealth mode.
Icmp Redirect for MITM on Windows XP/2003 and earlier Domain members. This attack combined with the DNS module is pretty effective.
WPAD rogue transparent proxy server. This module will capture all HTTP requests from anyone launching Internet Explorer on the network. This module is higly effective. You can now send your custom Pac script to a victim and inject HTML into the server's responses. See Responder.conf. This module is now enabled by default.
Analyze mode: This module allows you to see NBT-NS, BROWSER, LLMNR requests from which workstation to which workstation without poisoning any requests. Also, you can map domains, MSSQL servers, workstations passively, see if ICMP Redirects attacks are plausible on your subnet.
Responder is now using a configuration file. See Responder.conf.
Built-in POP3 auth server. This module will collect POP3 plaintext credentials
Built-in SMTP auth server. This module will collect PLAIN/LOGIN clear text credentials.

CONSIDERATIONS

This tool listen on several port: UDP 137, UDP 138, UDP 53, UDP/TCP 389,TCP 1433, TCP 80, TCP 139, TCP 445, TCP 21, TCP 3141,TCP 25, TCP 110, TCP 587 and Multicast UDP 5553. If you run Samba on your system, stop smbd and nmbd and all other services listening on these ports. For Ubuntu users: Edit this file /etc/NetworkManager/NetworkManager.conf and comment the line : "dns=dnsmasq". Then kill dnsmasq with this command (as root): killall dnsmasq -9
Any rogue server can be turn off in Responder.conf.
You can set a network interface via command line switch -I. Default is all.
This tool is not meant to work on Windows.

USAGE

First of all, please take a look at Responder.conf and set it for your needs. Running this tool:

./Responder.py [options]

Usage Example:

./Responder.py -i 10.20.30.40 -w -r -f

or:

python Responder.py -i 10.20.30.40 -wrf

Options List:

-h, --help show this help message and exit

-A, --analyze Analyze mode. This option allows you to see NBT-NS, BROWSER, LLMNR requests from which workstation to which workstation without poisoning anything.

-i 10.20.30.40, --ip=10.20.30.40 The ip address to redirect the traffic to. (usually yours)

-I eth0, --interface=eth0 Network interface to use

-b, --basic Set this if you want to return a Basic HTTP authentication. If not set, an NTLM authentication will be returned.

-r, --wredir Set this to enable answers for netbios wredir suffix queries. Answering to wredir will likely break stuff on the network (like classics 'nbns spoofer' would). Default value is therefore set to False

-d, --NBTNSdomain Set this to enable answers for netbios domain suffix queries. Answering to domain suffixes will likely break stuff on the network (like a classic 'nbns spoofer' would). Default value is therefore set to False

-f, --fingerprint This option allows you to fingerprint a host that issued an NBT-NS or LLMNR query.

-w, --wpad Set this to start the WPAD rogue proxy server. Default value is False

-F, --ForceWpadAuth Set this if you want to force NTLM/Basic authentication on wpad.dat file retrieval. This might cause a login prompt in some specific cases. Therefore, default value is False

--lm Set this if you want to force LM hashing downgrade for Windows XP/2003 and earlier. Default value is False

-v More verbose

For more information read these posts: http://blog.spiderlabs.com/2012/10/introducing-responder-10.html http://blog.spiderlabs.com/2013/01/owning-windows-networks-with-responder-17.html http://blog.spiderlabs.com/2013/02/owning-windows-network-with-responder-part-2.html http://blog.spiderlabs.com/2014/02/responder-20-owning-windows-networks-part-3.html

Follow our latest updates on twitter: https://twitter.com/PythonResponder

COPYRIGHT

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/

neroxyr/Responder

INTRODUCTION

FEATURES

CONSIDERATIONS

USAGE

COPYRIGHT