Potentially Suspicious GoogleUpdate Child Process

SIGMA detection rule by Nasreddine Bencherchali (Nextron Systems) · GPL-2.0

Detects potentially suspicious child processes of "GoogleUpdate.exe"

title: Potentially Suspicious GoogleUpdate Child Process
id: 54947316-2baa-1515-3a10-8569020a445a
related:
    - id: bdbab15a-3826-48fa-a1b7-723cd8f32fcc
      type: derived
    - id: 84b1ecf9-6eff-4004-bafb-bae5c0e251b2
      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:
    process_creation:
        EventID: 4688
        Channel: Security
    selection:
        ParentProcessName|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
        - NewProcessName|contains: \Google
        - NewProcessName|endswith:
              - \setup.exe
              - chrome_updater.exe
              - chrome_installer.exe
    filter_main_image_null:
        NewProcessName: null
    condition: process_creation and (selection and not 1 of filter_main_*)
falsepositives:
    - Unknown
level: high
ruletype: Sigma

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

6323b2a6-8164-4d06-8cc6-44cedaf335ad

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

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