Sigma rule: Potential Goofy Guineapig GoolgeUpdate Process Anomaly

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-19058f6efcd6, updated 2023-05-15T00:00:00.000Z.

Rule

Title
Potential Goofy Guineapig GoolgeUpdate Process Anomaly
Status
test
Level
high
Author
X__Junior (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)
Date
2023-05-15
File
rules-emerging-threats/2021/Malware/Goofy-Guineapig/proc_creation_win_malware_goofy_guineapig_googleupdate_uncommon_child_instance.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects "GoogleUpdate.exe" spawning a new instance of itself in an uncommon location as seen used by the Goofy Guineapig backdoor

Log source

product
windows
category
process_creation

Detection

selection:
    ParentImage|endswith: '\GoogleUpdate.exe'
    Image|endswith: '\GoogleUpdate.exe'
filter_main_legit_paths:
    - Image|startswith:
          - 'C:\Program Files\Google\'
          - 'C:\Program Files (x86)\Google\'
    - Image|contains: '\AppData\Local\Google\Update\'
condition: selection and not 1 of filter_main_*

False positives (as the rule lists them)

  • Unknown

Tags

  • detection.emerging-threats
  • attack.stealth

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2021/Malware/Goofy-Guineapig/proc_creation_win_malware_goofy_guineapig_googleupdate_uncommon_child_instance.yml

Sources and licences

  • SigmaHQ

    "Potential Goofy Guineapig GoolgeUpdate Process Anomaly" by X__Junior (Nextron Systems), Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2021/Malware/Goofy-Guineapig/proc_creation_win_malware_goofy_guineapig_googleupdate_uncommon_child_instance.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Potential Goofy Guineapig GoolgeUpdate Process Anomaly",
entity page, dataset version ref-19058f6efcd6, updated 2023-05-15T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/bdbab15a-3826-48fa-a1b7-723cd8f32fcc (accessed 2026-11-03).
Underlying source: SigmaHQ rule bdbab15a-3826-48fa-a1b7-723cd8f32fcc, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.