Invoke-Obfuscation STDIN+ Launcher - Security

 1title: Invoke-Obfuscation STDIN+ Launcher - Security
 2id: 0c718a5e-4284-4fb9-b4d9-b9a50b3a1974
 3related:
 4    - id: 72862bf2-0eb1-11eb-adc1-0242ac120002
 5      type: derived
 6status: test
 7description: Detects Obfuscated use of stdin to execute PowerShell
 8references:
 9    - https://github.com/SigmaHQ/sigma/issues/1009  # (Task 25)
10author: Jonathan Cheong, oscd.community
11date: 2020-10-15
12modified: 2022-11-29
13tags:
14    - attack.defense-evasion
15    - attack.t1027
16    - attack.execution
17    - attack.t1059.001
18logsource:
19    product: windows
20    service: security
21    definition: The 'System Security Extension' audit subcategory need to be enabled to log the EID 4697
22detection:
23    selection:
24        EventID: 4697
25        ServiceFileName|contains|all:
26            - 'cmd'
27            - 'powershell'
28    selection2:
29        ServiceFileName|contains:
30            - '${input}'
31            - 'noexit'
32    selection3:
33        ServiceFileName|contains:
34            - ' /c '
35            - ' /r '
36    condition: all of selection*
37falsepositives:
38    - Unknown
39level: high