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Cracking NetNTLM Challenge with Responder

To crack NetNTLM challenges, we'll leverage Responder to intercept and potentially decrypt these challenges.

PreviousLDAP Pass-back AttacksNextExploring Configuration Files for AD Credentials

Last updated 1 year ago

NetNTLM challenges are frequently transmitted across the network during authentication processes, and Responder provides us with the capability to execute Man-in-the-Middle attacks by manipulating responses in the context of NetNTLM authentication.

Installation of Responder:

  1. Start by downloading and installing Responder from its repository at: .

Configuration and Execution:

  1. Once Responder is installed, we will configure it to run on a specific network interface. Use the following command, replacing [INTERFACE] with the name of your target network interface:

    sudo responder -I [INTERFACE]

  2. Responder will now actively monitor the network for incoming LLMNR (Link-Local Multicast Name Resolution), NBT-NS (NetBIOS Name Service), or WPAD (Web Proxy Auto-Discovery) requests.

  3. Allow Responder to run for a while, enabling it to capture multiple authentication responses as they traverse the network.

Cracking Weak Passwords:

  1. If the targeted user accounts employ weak or easily guessable passwords, the chances of successful cracking increase significantly.

  2. To proceed with cracking, copy the NTLMv2-SSP Hash from Responder's output to a text file for further analysis.

  3. Utilize a password list and Hashcat, a popular password-cracking tool, to attempt to decipher the captured hash. Execute the following command, replacing <hash file> with the file containing the NTLMv2-SSP hash and <password file> with the password list:

    hashcat -m 5600 <hash file> <password file> --force
https://github.com/lgandx/Responder