Python Function Execution Security Warning Disabled In Excel - Registry

calendar Aug 29, 2024 · attack.defense-evasion attack.t1562.001  ·
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Detects changes to the registry value "PythonFunctionWarnings" that would prevent any warnings or alerts from showing when Python functions are about to be executed. Threat actors could run malicious code through the new Microsoft Excel feature that allows Python to run within the spreadsheet.

Sigma rule (View on GitHub)

 1title: Python Function Execution Security Warning Disabled In Excel - Registry
 2id: 17e53739-a1fc-4a62-b1b9-87711c2d5e44
 3related:
 4    - id: 023c654f-8f16-44d9-bb2b-00ff36a62af9
 5      type: similar
 6status: test
 7description: |
 8    Detects changes to the registry value "PythonFunctionWarnings" that would prevent any warnings or alerts from showing when Python functions are about to be executed.
 9    Threat actors could run malicious code through the new Microsoft Excel feature that allows Python to run within the spreadsheet.    
10references:
11    - https://support.microsoft.com/en-us/office/data-security-and-python-in-excel-33cc88a4-4a87-485e-9ff9-f35958278327
12author: Nasreddine Bencherchali (Nextron Systems), @Kostastsale
13date: 2024-08-23
14tags:
15    - attack.defense-evasion
16    - attack.t1562.001
17logsource:
18    category: registry_set
19    product: windows
20detection:
21    selection:
22        TargetObject|contains: '\Microsoft\Office\'
23        TargetObject|endswith: '\Excel\Security\PythonFunctionWarnings'
24        Details: 'DWORD (0x00000001)'
25    condition: selection
26falsepositives:
27    - Unknown
28level: high

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