User Added to Local Administrator Group

calendar Oct 23, 2025 · attack.initial-access attack.defense-evasion attack.privilege-escalation attack.t1078 attack.persistence attack.t1098  ·
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Detects the addition of a new member to the local administrator group, which could be legitimate activity or a sign of privilege escalation activity

Sigma rule (View on GitHub)

 1title: User Added to Local Administrator Group
 2id: c265cf08-3f99-46c1-8d59-328247057d57
 3status: stable
 4description: Detects the addition of a new member to the local administrator group, which could be legitimate activity or a sign of privilege escalation activity
 5references:
 6    - https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-10/security/threat-protection/auditing/event-4732
 7    - https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/manage/understand-security-identifiers
 8author: Florian Roth (Nextron Systems)
 9date: 2017-03-14
10modified: 2021-01-17
11tags:
12    - attack.initial-access
13    - attack.defense-evasion
14    - attack.privilege-escalation
15    - attack.t1078
16    - attack.persistence
17    - attack.t1098
18logsource:
19    product: windows
20    service: security
21detection:
22    selection_eid:
23        EventID: 4732
24    selection_group:
25        - TargetUserName|startswith: 'Administr'
26        - TargetSid: 'S-1-5-32-544'
27    filter_main_computer_accounts:
28        SubjectUserName|endswith: '$'
29    condition: all of selection_* and not 1 of filter_*
30falsepositives:
31    - Legitimate administrative activity
32level: medium

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