Bitlocker Key Retrieval — Sigma Rule

Rule metadata and linked tags

Author: Michael Epping, '@mepples21'. Source status: test; severity: medium. Source dates: 2022-06-28 / not supplied.

{
  "product": "azure",
  "service": "auditlogs"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 4427866c31b1dbb4d954ded4061197a53c652a46c3eff02d0367d0b69078e091

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Bitlocker Key Retrieval
id: a0413867-daf3-43dd-9245-734b3a787942
status: test
description: Monitor and alert for Bitlocker key retrieval.
references:
    - https://learn.microsoft.com/en-us/entra/architecture/security-operations-devices#bitlocker-key-retrieval
author: Michael Epping, '@mepples21'
date: 2022-06-28
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.initial-access
    - attack.stealth
    - attack.t1078.004
logsource:
    product: azure
    service: auditlogs
detection:
    selection:
        Category: KeyManagement
        OperationName: Read BitLocker key
    condition: selection
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://learn.microsoft.com/en-us/entra/architecture/security-operations-devices#bitlocker-key-retrieval