detection.wiki

Detection rules › Sigma

Bitlocker Key Retrieval

Status
test
Severity
medium
Log source
product azure, service auditlogs
Author
Michael Epping, '@mepples21'
Source
github.com/SigmaHQ/sigma

Monitor and alert for Bitlocker key retrieval.

MITRE ATT&CK coverage

TacticTechniques
Initial AccessT1078.004 Valid Accounts: Cloud Accounts
PersistenceT1078.004 Valid Accounts: Cloud Accounts
Privilege EscalationT1078.004 Valid Accounts: Cloud Accounts
StealthT1078.004 Valid Accounts: Cloud Accounts

Event coverage

ProviderEvent
Entra-AuditLogsRead BitLocker key

Rule body yaml

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

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    Category: KeyManagement
    OperationName: Read BitLocker key

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
Categoryeq
  • KeyManagement
OperationNameeq
  • Read BitLocker key