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APT-C-36 domain indicators

SIGhighconfidence 86/100generated 2026-10-18

Any of 3 high-confidence domain indicators skopnix attributes to APT-C-36.

ATT&CK: T1071 mitre ↗
Linked actors: APT-C-36
False positives: Every value is a skopnix indicator tied to APT-C-36 with confidence >= 86 from >= 2 independent sources, warninglist-clean (reserved / CDN / cloud / scanners / top sites) — re-validate against last_seen before blocking.

Sigma rule

skopnix-sigma-actor-apt-c-36-domain-7019f2ac.ymldownload .yml ↓

title: Skopnix - APT-C-36 domain indicators
id: b88fe553-404c-5586-b784-bb044ea14fcd
status: experimental
description: Any of 3 high-confidence domain indicators skopnix attributes to APT-C-36.
references:
  - https://skopnix.com/actors/apt-c-36
author: skopnix
date: '2026-10-18'
tags:
  - attack.command-and-control
  - attack.t1071
logsource:
  category: dns
detection:
  selection:
    query:
      - acortaurl.com
      - cort.as
      - gtly.to
  condition: selection
falsepositives:
  - Legitimate services sharing the address; verify against skopnix confidence + last_seen
level: high

How to deploy on Sigma

1.Convert for your SIEM with sigma-cli / pySigma, e.g. sigma convert -t splunk -p sysmon rule.yml.
2.Run it as a hunt first: every rule ships as status experimental.
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

skopnix.com/actors/apt-c-36 ↗