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RUBYCARP domain indicators

SIGhighconfidence 77/100generated 2026-10-18

Any of 1 high-confidence domain indicators skopnix attributes to RUBYCARP.

ATT&CK
T1071 mitre ↗
Linked actors
RUBYCARP
False positives
Every value is a skopnix indicator tied to RUBYCARP with confidence >= 77 from >= 2 independent sources, warninglist-clean (reserved / CDN / cloud / scanners / top sites) — re-validate against last_seen before blocking.

Sigma rule

skopnix-sigma-actor-rubycarp-domain-79917cb6.ymldownload .yml ↓
title: Skopnix - RUBYCARP domain indicators
id: 452a3ac2-8e1d-562b-a220-9bc8568849fa
status: experimental
description: Any of 1 high-confidence domain indicators skopnix attributes to RUBYCARP.
references:
  - https://skopnix.com/actors/rubycarp
author: skopnix
date: '2026-10-18'
tags:
  - attack.command-and-control
  - attack.t1071
logsource:
  category: dns
detection:
  selection:
    query:
      - sshd.run
  condition: selection
falsepositives:
  - Legitimate services sharing the address; verify against skopnix confidence + last_seen
level: high

How to deploy on Sigma

  1. 1.Convert for your SIEM with sigma-cli / pySigma, e.g. sigma convert -t splunk -p sysmon rule.yml.
  2. 2.Run it as a hunt first: every rule ships as status experimental.
  3. 3.Promote to an alert once a week of results is clean on your data.

Check · The processing pipeline must map the logsource (firewall, dns, proxy, webserver, process_creation) to your field names.

References