Add Windows Capability Via PowerShell Cmdlet

calendar Apr 1, 2024 · attack.execution  ·
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Detects usage of the "Add-WindowsCapability" cmdlet to add Windows capabilities. Notable capabilities could be "OpenSSH" and others.

Sigma rule (View on GitHub)

 1title: Add Windows Capability Via PowerShell Cmdlet
 2id: b36d01a3-ddaf-4804-be18-18a6247adfcd
 3related:
 4    - id: 155c7fd5-47b4-49b2-bbeb-eb4fab335429
 5      type: similar
 6status: test
 7description: Detects usage of the "Add-WindowsCapability" cmdlet to add Windows capabilities. Notable capabilities could be "OpenSSH" and others.
 8references:
 9    - https://learn.microsoft.com/en-us/windows-server/administration/openssh/openssh_install_firstuse?tabs=powershell
10    - https://www.virustotal.com/gui/file/af1c82237b6e5a3a7cdbad82cc498d298c67845d92971bada450023d1335e267/content
11author: Nasreddine Bencherchali (Nextron Systems)
12date: 2023/01/22
13modified: 2023/05/09
14tags:
15    - attack.execution
16logsource:
17    product: windows
18    category: process_creation
19detection:
20    selection_img:
21        - Image|endswith:
22              - '\powershell.exe'
23              - '\pwsh.exe'
24        - OriginalFileName:
25              - 'PowerShell.EXE'
26              - 'pwsh.dll'
27    selection_cmdlet:
28        CommandLine|contains: 'Add-WindowsCapability'
29    selection_capa:
30        CommandLine|contains: 'OpenSSH.' # For both "OpenSSH.Server" and "OpenSSH.Client"
31    condition: all of selection_*
32falsepositives:
33    - Legitimate usage of the capabilities by administrators or users. Add additional filters accordingly.
34level: medium

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