Suspicious Speech Runtime Binary Child Process

Status: experimental
Severity: high
Log source: category process_creation, product windows
Author: andrewdanis
Source: github.com/SigmaHQ/sigma

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.

Known false positives

Unlikely.

MITRE ATT&CK coverage

Tactic	Techniques
Stealth	`T1218` System Binary Proxy Execution
Lateral Movement	`T1021.003` Remote Services: Distributed Component Object Model

Telemetry coverage

Provider	Record / event type
Sysmon	Event ID 1: Process creation
Security-Auditing	Event ID 4688: A new process has been created.

Rule body

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

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    ParentImage|endswith: '\SpeechRuntime.exe'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`ParentImage`	ends_with	`\SpeechRuntime.exe`	`field:"ParentImage" kind:ends_with value:"\SpeechRuntime.exe"`