Cracking NetNTLM Challenge with Responder

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

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: https://github.com/lgandx/Responder.

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