sigmaDRL-1.1from SigmaHQ/sigma

Enable LM Hash Storage

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.

Quality

100

FP risk

—

Forks

Views

ATT&CK techniques

T1112

Rule sourcerules/windows/registry/registry_set/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: test
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.persistence
    - 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