Detection rules › Sigma
Potentially Suspicious GoogleUpdate Child Process
Detects potentially suspicious child processes of "GoogleUpdate.exe"
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Stealth | 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: Potentially Suspicious GoogleUpdate Child Process
id: 84b1ecf9-6eff-4004-bafb-bae5c0e251b2
related:
- id: bdbab15a-3826-48fa-a1b7-723cd8f32fcc
type: derived
status: test
description: Detects potentially suspicious child processes of "GoogleUpdate.exe"
references:
- https://www.ncsc.gov.uk/static-assets/documents/malware-analysis-reports/goofy-guineapig/NCSC-MAR-Goofy-Guineapig.pdf
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-05-15
modified: 2023-05-22
tags:
- attack.stealth
logsource:
category: process_creation
product: windows
detection:
selection:
ParentImage|endswith: '\GoogleUpdate.exe'
filter_main_known_legit:
# Some other legit child process might exist. It's better to make a baseline before running this in production
- Image|contains: '\Google' # Example: GoogleUpdate.exe, GoogleCrashHandler.exe, GoogleUpdateComRegisterShell64.exe
- Image|endswith:
- '\setup.exe'
- 'chrome_updater.exe'
- 'chrome_installer.exe'
filter_main_image_null:
Image: null
condition: selection and not 1 of filter_main_*
falsepositives:
- Unknown
level: high
Stages and Predicates
Stage 0: condition
selection and not 1 of filter_main_*Stage 1: selection
selection:
ParentImage|endswith: '\GoogleUpdate.exe'
Stage 2: not filter_main_*
filter_main_known_legit:
- Image|contains: '\Google'
- Image|endswith:
- '\setup.exe'
- 'chrome_updater.exe'
- 'chrome_installer.exe'
filter_main_image_null:
Image: null
Exclusions
The rule actively suppresses these predicates.
| Field | Kind | Excluded values | Search |
|---|---|---|---|
Image | ends_with | \setup.exe | excludes:Image field:"Image" value:"\setup.exe" |
Image | ends_with | chrome_installer.exe | excludes:Image field:"Image" value:"chrome_installer.exe" |
Image | ends_with | chrome_updater.exe | excludes:Image field:"Image" value:"chrome_updater.exe" |
Image | is_null | excludes:Image | |
Image | match | \Google | excludes:Image field:"Image" value:"\Google" |
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
ParentImage | ends_with |
| field:"ParentImage" kind:ends_with value:"\GoogleUpdate.exe" |