Detection rules › Sigma
Uncommon Child Processes Of SndVol.exe
Detects potentially uncommon child processes of SndVol.exe (the Windows volume mixer)
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | No specific technique |
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: Uncommon Child Processes Of SndVol.exe
id: ba42babc-0666-4393-a4f7-ceaf5a69191e
status: test
description: Detects potentially uncommon child processes of SndVol.exe (the Windows volume mixer)
references:
- https://twitter.com/Max_Mal_/status/1661322732456353792
author: X__Junior (Nextron Systems)
date: 2023-06-09
tags:
- attack.execution
logsource:
product: windows
category: process_creation
detection:
selection:
ParentImage|endswith: '\SndVol.exe'
filter_main_rundll32:
Image|endswith: '\rundll32.exe'
CommandLine|contains: ' shell32.dll,Control_RunDLL '
condition: selection and not 1 of filter_main_*
falsepositives:
- Unknown
level: medium
Stages and Predicates
Stage 0: condition
selection and not 1 of filter_main_*Stage 1: selection
selection:
ParentImage|endswith: '\SndVol.exe'
Stage 2: not filter_main_rundll32
filter_main_rundll32:
Image|endswith: '\rundll32.exe'
CommandLine|contains: ' shell32.dll,Control_RunDLL '
Exclusions
The rule actively suppresses these predicates.
| Field | Kind | Excluded values | Search |
|---|---|---|---|
CommandLine | match | shell32.dll,Control_RunDLL | excludes:CommandLine field:"CommandLine" value:" shell32.dll,Control_RunDLL " |
Image | ends_with | \rundll32.exe | excludes:Image field:"Image" value:"\rundll32.exe" |
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
ParentImage | ends_with |
| field:"ParentImage" kind:ends_with value:"\SndVol.exe" |