Suspicious Standard User In High Privileged Group (via lsa-server)

title: Suspicious Standard User In High Privileged Group (via lsa-server)
id: 661d6f08-69e3-5219-99c6-c0053cdd3a62
status: stable
description: This rule detects standard users login that are part of high privileged groups such as the Administrator group
references:
    - https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/manage/understand-security-identifiers
    - https://learn.microsoft.com/en-us/windows-server/security/credentials-protection-and-management/configuring-additional-lsa-protection
    - https://github.com/nasbench/EVTX-ETW-Resources/blob/7a806a148b3d9d381193d4a80356016e6e8b1ee8/ETWProvidersManifests/Windows11/22H2/W11_22H2_Pro_20221220_22621.963/WEPExplorer/LsaSrv.xml
author: Huntrule Team
date: 2026-07-24
tags:
    - attack.credential-access
    - attack.privilege-escalation
    - attack.persistence
    - attack.defense-evasion
    - attack.t1078
logsource:
    product: windows
    service: lsa-server
    definition: 'Requirements: Microsoft-Windows-LSA/Operational (199FE037-2B82-40A9-82AC-E1D46C792B99) Event Log must be enabled and collected in order to use this rule.'
detection:
    selection:
        EventID: 300
        TargetUserSid|startswith: 'S-1-5-21-'
        SidList|contains:
            - 'S-1-5-32-544'
            - '-500}'
            - '-518}'
            - '-519}'
    filter_main_admin:
        TargetUserSid|endswith:
            - '-500'
            - '-518'
            - '-519'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unknown
level: medium