huntrule

Windows: reg.exe Adds BitLocker Policy Registry Values

Flags reg.exe registry additions targeting BitLocker policy keys associated with configuration changes.

FreeReviewedSigma · High · v1
Product
windows
Category
process_creation
Author
frack113 (SigmaHQ), DRL 1.1
Published
2021-11-15
Updated
2026-07-30
AnalysisDetection

ATT&CK techniques

Impact

  1. Recon

  2. Resource Dev

  3. Initial Access

  4. Execution

  5. Persistence

  6. Priv Esc

  7. Defense Evasion

  8. Cred Access

  9. Discovery

  10. Lateral Movement

  11. Collection

  12. C2

  13. Exfiltration

  14. Impact

What it detects

This rule identifies suspicious use of reg.exe to add BitLocker-related policy registry values under SOFTWARE\Policies\Microsoft\FVE. Attackers may attempt to weaken BitLocker protections or alter startup and recovery configuration by writing specific policy fields. Detection relies on Windows process creation telemetry capturing the command line arguments passed to reg.exe.

Reporting behind it

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Malicious Forced BitLocker Encryption for Extortion (via process_creation)
Windows: reg.exe Adds BitLocker Policy Registry Values
Pivot detection · T1486 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.