User Added to Local Administrator Group

calendar Jan 29, 2024 · 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/windows/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.privilege_escalation
13    - attack.t1078
14    - attack.persistence
15    - attack.t1098
16logsource:
17    product: windows
18    service: security
19detection:
20    selection_eid:
21        EventID: 4732
22    selection_group:
23        - TargetUserName|startswith: 'Administr'
24        - TargetSid: 'S-1-5-32-544'
25    filter_main_computer_accounts:
26        SubjectUserName|endswith: '$'
27    condition: all of selection_* and not 1 of filter_*
28falsepositives:
29    - Legitimate administrative activity
30level: medium

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