Sigma rule: Default Cobalt Strike Certificate

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-b757dfbe84a3, updated 2022-10-09T00:00:00.000Z.

Rule

Title: Default Cobalt Strike Certificate
Status: test
Level: high
Author: Bhabesh Raj
Date: 2021-06-23
Modified: 2022-10-09
File: rules/network/zeek/zeek_default_cobalt_strike_certificate.yml
Commit: ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects the presence of default Cobalt Strike certificate in the HTTPS traffic

Log source

product: zeek
service: x509

Detection

selection:
    certificate.serial: 8BB00EE
condition: selection

False positives (as the rule lists them)

Unknown

MITRE ATT&CK ids this rule names

S0154

References

https://sergiusechel.medium.com/improving-the-network-based-detection-of-cobalt-strike-c2-servers-in-the-wild-while-reducing-the-6964205f6468

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/network/zeek/zeek_default_cobalt_strike_certificate.yml

Sources and licences

SigmaHQ
"Default Cobalt Strike Certificate" by Bhabesh Raj (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/network/zeek/zeek_default_cobalt_strike_certificate.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: Default Cobalt Strike Certificate",
entity page, dataset version ref-b757dfbe84a3, updated 2022-10-09T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/7100f7e3-92ce-4584-b7b7-01b40d3d4118 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 7100f7e3-92ce-4584-b7b7-01b40d3d4118, 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.