Sigma rule: Potential Goofy Guineapig Backdoor Activity

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-1078ffbfa26f, updated 2023-05-14T00:00:00.000Z.

Rule

Title
Potential Goofy Guineapig Backdoor Activity
Status
test
Level
high
Author
X__Junior (Nextron Systems)
Date
2023-05-14
File
rules-emerging-threats/2021/Malware/Goofy-Guineapig/proc_creation_win_malware_goofy_guineapig_broken_cmd.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects a specific broken command that was used by Goofy-Guineapig as described by the NCSC report.

Log source

product
windows
category
process_creation

Detection

selection:
    CommandLine|contains: 'choice /t %d /d y /n >nul'
condition: selection

False positives (as the rule lists them)

  • Unlikely

Tags

  • attack.execution
  • detection.emerging-threats

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_broken_cmd.yml

Sources and licences

  • SigmaHQ

    "Potential Goofy Guineapig Backdoor Activity" by X__Junior (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2021/Malware/Goofy-Guineapig/proc_creation_win_malware_goofy_guineapig_broken_cmd.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 Backdoor Activity",
entity page, dataset version ref-1078ffbfa26f, updated 2023-05-14T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/477a5ed3-a374-4282-9f3b-ed94e159a108 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 477a5ed3-a374-4282-9f3b-ed94e159a108, 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.