Suspicious Speech Runtime Binary Child Process — Sigma Rule

Rule metadata and linked tags

Author: andrewdanis. Source status: experimental; severity: high. Source dates: 2025-10-23 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 2b32d2008e659ec6613ca69d7ca37cc420bcc9303d9f76ac22fba9c040021863

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: Suspicious Speech Runtime Binary Child Process
id: 78f10490-f2f4-4d19-a75b-4e0683bf3b8d
status: experimental
description: |
    Detects suspicious Speech Runtime Binary Execution by monitoring its child processes.
    Child processes spawned by SpeechRuntime.exe could indicate an attempt for lateral movement via COM & DCOM hijacking.
references:
    - https://github.com/rtecCyberSec/SpeechRuntimeMove
author: andrewdanis
date: 2025-10-23
logsource:
    category: process_creation
    product: windows
tags:
    - attack.lateral-movement
    - attack.stealth
    - attack.t1021.003
    - attack.t1218
detection:
    selection:
        ParentImage|endswith: '\SpeechRuntime.exe'
    condition: selection
falsepositives:
    - Unlikely.
level: high

Original YAML and metadata in JSON

False positives

• Unlikely.

Source references

• https://github.com/rtecCyberSec/SpeechRuntimeMove