Sigma rule: Goofy Guineapig Backdoor Potential C2 Communication

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-5a79b58024a9, updated 2023-05-14T00:00:00.000Z.

Rule

Title
Goofy Guineapig Backdoor Potential C2 Communication
Status
test
Level
high
Author
Nasreddine Bencherchali (Nextron Systems)
Date
2023-05-14
File
rules-emerging-threats/2021/Malware/Goofy-Guineapig/proxy_malware_goofy_gunieapig_c2_communication.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects potential C2 communication related to Goofy Guineapig backdoor

Log source

category
proxy

Detection

selection:
    c-useragent: 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36'
    cs-host: 'static.tcplog.com'
condition: selection

False positives (as the rule lists them)

  • Unlikely

Tags

  • attack.command-and-control
  • 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/proxy_malware_goofy_gunieapig_c2_communication.yml

Sources and licences

  • SigmaHQ

    "Goofy Guineapig Backdoor Potential C2 Communication" by Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2021/Malware/Goofy-Guineapig/proxy_malware_goofy_gunieapig_c2_communication.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: Goofy Guineapig Backdoor Potential C2 Communication",
entity page, dataset version ref-5a79b58024a9, updated 2023-05-14T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/4f573bb6-701a-4b8d-91db-87ae106e9a61 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 4f573bb6-701a-4b8d-91db-87ae106e9a61, 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.