OpenCanary - NTP Monlist Request — Sigma Rule

Rule metadata and linked tags

Author: Security Onion Solutions. Source status: test; severity: high. Source dates: 2024-03-08 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: a5fb4dc3c5bfdbae381b0b52f2c99281880816329a6714e101b250ac56bc9330

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 - NTP Monlist Request
id: 7cded4b3-f09e-405a-b96f-24248433ba44
status: test
description: Detects instances where an NTP service on an OpenCanary node has had a NTP monlist request.
references:
    - https://opencanary.readthedocs.io/en/latest/starting/configuration.html#services-configuration
    - https://github.com/thinkst/opencanary/blob/a0896adfcaf0328cfd5829fe10d2878c7445138e/opencanary/logger.py#L52
author: Security Onion Solutions
date: 2024-03-08
tags:
    - attack.impact
    - attack.t1498
logsource:
    category: application
    product: opencanary
detection:
    selection:
        logtype: 11001
    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