User Added To Highly Privileged Group

 1title: User Added To Highly Privileged Group
 2id: 10fb649c-3600-4d37-b1e6-56ea90bb7e09 # Privileged groups
 3related:
 4    - id: ffa28e60-bdb1-46e0-9f82-05f7a61cc06e # Remote Desktop groups
 5      type: similar
 6    - id: ad720b90-25ad-43ff-9b5e-5c841facc8e5 # Admin groups
 7      type: similar
 8status: test
 9description: Detects addition of users to highly privileged groups via "Net" or "Add-LocalGroupMember".
10references:
11    - https://www.huntress.com/blog/slashandgrab-screen-connect-post-exploitation-in-the-wild-cve-2024-1709-cve-2024-1708
12author: Nasreddine Bencherchali (Nextron Systems)
13date: 2024/02/23
14tags:
15    - attack.persistence
16    - attack.t1098
17logsource:
18    category: process_creation
19    product: windows
20detection:
21    selection_main:
22        - CommandLine|contains|all:
23              # net.exe
24              - 'localgroup '
25              - ' /add'
26        - CommandLine|contains|all:
27              # powershell.exe
28              - 'Add-LocalGroupMember '
29              - ' -Group '
30    selection_group:
31        CommandLine|contains:
32            - 'Group Policy Creator Owners'
33            - 'Schema Admins'
34    condition: all of selection_*
35falsepositives:
36    - Administrative activity that must be investigated
37level: high