Phoenix Studio

Convert indexed Sigma rules into analyst-ready detections.

This studio is built around Phoenix's own rule corpus, not a blank editor. Search by title or rule id, choose a live sigma-cli backend, then reveal pipelines only when you actually need them.

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Indexed Rules

3,707

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Backends

Live from sigconverter.io

CLI Versions

Newest: 2.0.2

Translation Workspace

Shape the rule before it leaves Phoenix

Tune Translation

Active Rule

Directory Service Restore Mode(DSRM) Registry Value Tampering

sigma-cli version

Backend

Format

Target Profile

Splunk

Splunk SPL & tstats data model queries

Format Mode

Default

Plain SPL queries

Conversion Output

Directory Service Restore Mode(DSRM) Registry Value Tampering

Using Splunk · Default · sigma-cli 2.0.2

Translation controls

Adjust the rule on the left, then regenerate when you want a fresh backend-native query.

BackendSplunkFormatDefaultVersion2.0.2

title: Directory Service Restore Mode(DSRM) Registry Value Tampering
id: b61e87c0-50db-4b2e-8986-6a2be94b33b0
related:
    - id: 53ad8e36-f573-46bf-97e4-15ba5bf4bb51
      type: similar
status: test
description: |
    Detects changes to "DsrmAdminLogonBehavior" registry value.
    During a Domain Controller (DC) promotion, administrators create a Directory Services Restore Mode (DSRM) local administrator account with a password that rarely changes. The DSRM account is an “Administrator” account that logs in with the DSRM mode when the server is booting up to restore AD backups or recover the server from a failure.
    Attackers could abuse DSRM account to maintain their persistence and access to the organization's Active Directory.
    If the "DsrmAdminLogonBehavior" value is set to "0", the administrator account can only be used if the DC starts in DSRM.
    If the "DsrmAdminLogonBehavior" value is set to "1", the administrator account can only be used if the local AD DS service is stopped.
    If the "DsrmAdminLogonBehavior" value is set to "2", the administrator account can always be used.
references:
    - https://adsecurity.org/?p=1785
    - https://www.sentinelone.com/blog/detecting-dsrm-account-misconfigurations/
    - https://book.hacktricks.xyz/windows-hardening/active-directory-methodology/dsrm-credentials
author: Nischal Khadgi
date: 2024-07-11
tags:
    - attack.defense-evasion
    - attack.credential-access
    - attack.persistence
    - attack.t1556
logsource:
    category: registry_set
    product: windows
detection:
    selection:
        TargetObject|endswith: '\Control\Lsa\DsrmAdminLogonBehavior'
    filter_main_default_value:
        Details: 'DWORD (0x00000000)' # Default value
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unknown
level: high

CLI command

Copy the exact command to reproduce this translation locally.

sigma convert --without-pipeline -t splunk -f default rules/windows/registry/registry_set/registry_set_dsrm_tampering.yml