Reconnaissance Activity

calendar Feb 1, 2023 · attack.discovery attack.t1087.002 attack.t1069.002 attack.s0039  ·
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Detects activity as "net user administrator /domain" and "net group domain admins /domain"

Sigma rule (View on GitHub)

 1title: Reconnaissance Activity
 2id: 968eef52-9cff-4454-8992-1e74b9cbad6c
 3status: test
 4description: Detects activity as "net user administrator /domain" and "net group domain admins /domain"
 5references:
 6    - https://findingbad.blogspot.de/2017/01/hunting-what-does-it-look-like.html
 7author: Florian Roth (Nextron Systems), Jack Croock (method), Jonhnathan Ribeiro (improvements), oscd.community
 8date: 2017/03/07
 9modified: 2022/08/22
10tags:
11    - attack.discovery
12    - attack.t1087.002
13    - attack.t1069.002
14    - attack.s0039
15logsource:
16    product: windows
17    service: security
18    definition: The volume of Event ID 4661 is high on Domain Controllers and therefore "Audit SAM" and "Audit Kernel Object" advanced audit policy settings are not configured in the recommendations for server systems
19detection:
20    selection:
21        EventID: 4661
22        AccessMask: '0x2d'
23        ObjectType:
24            - 'SAM_USER'
25            - 'SAM_GROUP'
26        ObjectName|startswith: 'S-1-5-21-'
27        ObjectName|endswith:
28            - '-500'
29            - '-512'
30    condition: selection
31falsepositives:
32    - Administrator activity
33level: high

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