Sigma rule: Suspicious Reg Add BitLocker

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-2091188bc607, updated 2022-09-09T00:00:00.000Z.

Rule

Title: Suspicious Reg Add BitLocker
Status: test
Level: high
Author: frack113
Date: 2021-11-15
Modified: 2022-09-09
File: rules/windows/process_creation/proc_creation_win_reg_bitlocker.yml
Commit: ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects suspicious addition to BitLocker related registry keys via the reg.exe utility

Log source

product: windows
category: process_creation

Detection

selection:
    CommandLine|contains|all:
        - 'REG'
        - 'ADD'
        - '\SOFTWARE\Policies\Microsoft\FVE'
        - '/v'
        - '/f'
    CommandLine|contains:
        - 'EnableBDEWithNoTPM'
        - 'UseAdvancedStartup'
        - 'UseTPM'
        - 'UseTPMKey'
        - 'UseTPMKeyPIN'
        - 'RecoveryKeyMessageSource'
        - 'UseTPMPIN'
        - 'RecoveryKeyMessage'
condition: selection

False positives (as the rule lists them)

Unlikely

MITRE ATT&CK ids this rule names

T1486

References

https://thedfirreport.com/2021/11/15/exchange-exploit-leads-to-domain-wide-ransomware/

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_bitlocker.yml

Sources and licences

SigmaHQ
"Suspicious Reg Add BitLocker" by frack113 (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_reg_bitlocker.yml.
Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License
Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Suspicious Reg Add BitLocker",
entity page, dataset version ref-2091188bc607, updated 2022-09-09T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/0e0255bf-2548-47b8-9582-c0955c9283f5 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 0e0255bf-2548-47b8-9582-c0955c9283f5, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.