Python Function Execution Security Warning Disabled In Excel — Sigma Rule

Rule metadata and linked tags

Author: @Kostastsale. Source status: test; severity: high. Source dates: 2023-08-22 / not supplied.

{
  "category": "process_creation",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 765b077d660836c58bd8d1141224242b1882258b5c647f0ed4f734ae94485e3c

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Python Function Execution Security Warning Disabled In Excel
id: 023c654f-8f16-44d9-bb2b-00ff36a62af9
related:
    - id: 17e53739-a1fc-4a62-b1b9-87711c2d5e44
      type: similar
status: test
description: |
    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.
references:
    - https://support.microsoft.com/en-us/office/data-security-and-python-in-excel-33cc88a4-4a87-485e-9ff9-f35958278327
author: '@Kostastsale'
date: 2023-08-22
tags:
    - attack.defense-impairment
    - attack.t1685
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        CommandLine|contains|all:
            - '\Microsoft\Office\'
            - '\Excel\Security'
            - 'PythonFunctionWarnings'
        CommandLine|contains: ' 0'
    condition: selection
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://support.microsoft.com/en-us/office/data-security-and-python-in-excel-33cc88a4-4a87-485e-9ff9-f35958278327