OpenCanary - TFTP 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: 4b66d3d9ff2498539780c9ab7d6f3d2e5e2a7540d9b338dc32fce4b3e89e3a1e

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 - TFTP Request
id: b4e6b016-a2ac-4759-ad85-8000b300d61e
status: test
description: Detects instances where a TFTP service on an OpenCanary node has had a 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.exfiltration
    - attack.t1041
logsource:
    category: application
    product: opencanary
detection:
    selection:
        logtype: 10001
    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