Detecting NTLM Relay with Event Correlation

Authorized Testing Disclaimer: The offensive techniques and attack simulations described in this skill are intended exclusively for authorized penetration testing, red team engagements, purple team exercises, and security research conducted with explicit written permission from the system owner. Unauthorized use of these techniques against systems you do not own or have permission to test is illegal and unethical. Always operate within the scope of your engagement and comply with applicable laws and regulations.

Overview

NTLM relay attacks intercept NTLM authentication messages and forward them to a target service to gain unauthorized access. Attackers use tools like Responder for LLMNR/NBT-NS/mDNS poisoning, ntlmrelayx (Fox-IT/Impacket) for multi-protocol relay, and coercion techniques like PetitPotam (MS-EFSRPC) and DFSCoerce to force authentication from high-value targets like domain controllers. This skill provides a comprehensive event correlation framework using Windows Security Event 4624 LogonType 3 analysis, IP-to-hostname mismatch detection, Responder traffic identification, SMB/LDAP signing audit, and NTLM downgra…