registry_set_system_lsa_nolmhash.yml

title: Enable LM Hash Storage
id: c420410f-c2d8-4010-856b-dffe21866437
related:
    - id: 98dedfdd-8333-49d4-9f23-d7018cccae53 # process_creation
      type: similar
status: experimental
description: |
    Detects changes to the "NoLMHash" registry value in order to allow Windows to store LM Hashes.
    By setting this registry value to "0" (DWORD), Windows will be allowed to store a LAN manager hash of your password in Active Directory and local SAM databases.
references:
    - https://www.cisa.gov/news-events/cybersecurity-advisories/aa23-347a
    - https://learn.microsoft.com/en-us/troubleshoot/windows-server/windows-security/prevent-windows-store-lm-hash-password
    - https://www.sans.org/blog/protecting-privileged-domain-accounts-lm-hashes-the-good-the-bad-and-the-ugly/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023/12/15
tags:
    - attack.defense_evasion
    - attack.t1112
logsource:
    product: windows
    category: registry_set
detection:
    selection:
        TargetObject|endswith: 'System\CurrentControlSet\Control\Lsa\NoLMHash'
        Details: 'DWORD (0x00000000)'
    condition: selection
falsepositives:
    - Unknown
level: high