OpenCanary - NMAP XMAS Scan — Sigma Rule

Rule metadata and linked tags

Author: Marco Pedrinazzi (@pedrinazziM). Source status: experimental; severity: high. Source dates: 2026-01-06 / not supplied.

{
  "category": "application",
  "product": "opencanary"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 3eee6b66eea6268867e56a24c93f58ac3872d4b3d524bc26132ef60ea4ec9c1a

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: OpenCanary - NMAP XMAS Scan
id: d7553d7b-f485-479c-b192-cdac6edd83a4
status: experimental
description: Detects instances where an OpenCanary node has been targeted by a NMAP XMAS Scan
references:
    - https://opencanary.readthedocs.io/en/latest/starting/configuration.html#services-configuration
    - https://github.com/thinkst/opencanary/blob/a0896adfcaf0328cfd5829fe10d2878c7445138e/opencanary/logger.py#L52
author: Marco Pedrinazzi (@pedrinazziM)
date: 2026-01-06
tags:
    - attack.discovery
    - attack.t1046
logsource:
    category: application
    product: opencanary
detection:
    selection:
        logtype: 5004
    condition: selection
falsepositives:
    - Unlikely
level: high

Original YAML and metadata in JSON

False positives

• Unlikely

Source references

• https://opencanary.readthedocs.io/en/latest/starting/configuration.html#services-configuration
• https://github.com/thinkst/opencanary/blob/a0896adfcaf0328cfd5829fe10d2878c7445138e/opencanary/logger.py#L52