llmnr-disabled: LLMNR Disabled

id: llmnr-disabled

info:
  name: LLMNR Disabled
  author: princechaddha
  severity: medium
  description: Determine if LLMNR (Link-Local Multicast Name Resolution) is disabled.
  impact: |
    Enabling LLMNR can expose systems to man-in-the-middle attacks.
  remediation: |
    Disable LLMNR to reduce the risk of such attacks.
  tags: windows,llmnr,network,security,code,windows-audit

self-contained: true

code:
  - pre-condition: |
      IsWindows();
    engine:
      - powershell
      - powershell.exe
    args:
      - -ExecutionPolicy
      - Bypass
    pattern: "*.ps1"
    source: |
      $lmnrStatus = Get-ItemProperty -Path 'HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\DNSClient' -Name 'EnableMulticast' -ErrorAction SilentlyContinue
      if ($lmnrStatus -and $lmnrStatus.EnableMulticast -eq 0) {"LLMNR is correctly disabled"} else {"LLMNR is misconfigured or enabled by default"}

    matchers:
      - type: word
        words:
          - "LLMNR is misconfigured or enabled by default"
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