Sigma rule: Enable LM Hash Storage - ProcCreation

Rule

Title

Enable LM Hash Storage - ProcCreation

Status

test

Level

high

Author

Nasreddine Bencherchali (Nextron Systems)

Date

2023-12-15

Modified

2023-12-22

File

rules/windows/process_creation/proc_creation_win_reg_nolmhash.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

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.

Log source

product

windows

category

process_creation

Detection

selection:
    CommandLine|contains|all:
        - '\System\CurrentControlSet\Control\Lsa'
        - 'NoLMHash'
        - ' 0'
condition: selection

False positives (as the rule lists them)

• Unknown

Tags

• attack.persistence
• attack.defense-impairment
• attack.t1112

MITRE ATT&CK ids this rule names

• T1112

Related rules

• c420410f-c2d8-4010-856b-dffe21866437 (similar)

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/

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_reg_nolmhash.yml