Python Spawning Pretty TTY on Windows — Sigma Rule

Rule metadata and linked tags

Author: Nextron Systems. Source status: test; severity: high. Source dates: 2022-06-03 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 9b20e6abf32a46370a1cdd32f45019b8b4fd9facf98e1efb01e825c116a10af4

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 Spawning Pretty TTY on Windows
id: 480e7e51-e797-47e3-8d72-ebfce65b6d8d
related:
    - id: 899133d5-4d7c-4a7f-94ee-27355c879d90
      type: derived
status: test
description: Detects python spawning a pretty tty
references:
    - https://www.volexity.com/blog/2022/06/02/zero-day-exploitation-of-atlassian-confluence/
author: Nextron Systems
date: 2022-06-03
tags:
    - attack.execution
    - attack.t1059
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        Image|endswith:
            - 'python.exe' # no \ bc of e.g. ipython.exe
            - 'python3.exe'
            - 'python2.exe'
    selection_cli_1:
        CommandLine|contains|all:
            - 'import pty'
            - '.spawn('
    selection_cli_2:
        CommandLine|contains: 'from pty import spawn'
    condition: selection_img and 1 of selection_cli_*
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://www.volexity.com/blog/2022/06/02/zero-day-exploitation-of-atlassian-confluence/