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2026-06-13

LLMNR Poisoning

SecurityActive DirectoryLLMNRnetworkWindows

Link Local Multicast Name Resolution — it's basically DNS. It's used to find a host when DNS fails to do so. Previously, NetBIOS was used for this.

Flaw: when we respond to this service, it responds back with the username and password hash.

LLMNR recall3 blanks

Link Local Multicast Name Resolution is a fallback when fails to resolve a host, and it replaced the older method. Because it answers anyone on the segment, poisoning it yields the victim's username and password .

try it before revealing

Read next

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  • 2024-11-12 · Deep DivesHow DNSSEC Works

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Suhesh Kasti — AppSec & Offensive Security

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