Suspicious Use of CSharp Interactive Console

calendar Mar 5, 2023 · attack.execution attack.t1127  ·
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Detects the execution of CSharp interactive console by PowerShell

Sigma rule (View on GitHub)

 1title: Suspicious Use of CSharp Interactive Console
 2id: a9e416a8-e613-4f8b-88b8-a7d1d1af2f61
 3status: test
 4description: Detects the execution of CSharp interactive console by PowerShell
 5references:
 6    - https://redcanary.com/blog/detecting-attacks-leveraging-the-net-framework/
 7author: Michael R. (@nahamike01)
 8date: 2020/03/08
 9modified: 2022/07/14
10tags:
11    - attack.execution
12    - attack.t1127
13logsource:
14    category: process_creation
15    product: windows
16detection:
17    selection:
18        Image|endswith: '\csi.exe'
19        ParentImage|endswith:
20            - '\powershell.exe'
21            - '\pwsh.exe'
22            - '\powershell_ise.exe'
23        OriginalFileName: 'csi.exe'
24    condition: selection
25falsepositives:
26    - Possible depending on environment. Pair with other factors such as net connections, command-line args, etc.
27level: high

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