OpenCanary: Detect NMAP OS Scan Targets via Application Logtype 5002

Alerts when OpenCanary records an NMAP OS scan event (logtype 5002), indicating host fingerprinting activity.

FreeReviewedSigma · High · v5

Product: opencanary
Category: application
Author: Marco Pedrinazzi (@pedrinazziM) (SigmaHQ), DRL 1.1
Published: 2026-01-06
Updated: 2026-07-31

ATT&CK techniques

Discovery

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
- T1046Network Service Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule identifies when an OpenCanary honeypot records an event indicating it was targeted by an NMAP OS scan. Fingerprinting services with OS detection can support later exploitation by revealing likely platforms and software versions. The detection relies on OpenCanary application telemetry, specifically log entries with logtype 5002.

Reporting behind it

Related detections9 linkedT1046 — drag to rearrange

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Suspicious Network Reconnaissance via Advanced Port Scanner

Suspicious Nmap Scanner Probe URIs in HTTP Requests (via webserver)

Suspicious Internet Scanning for Docker and Kubelet Ports via masscan

Suspicious Fscan Internal Network Scanner Execution (via process_creation)

Possible Network Service Scanning via Nmap or Masscan (via process_creation)

Malicious Anonymous Login - Domain Specified (via security)

Suspicious Network Scanning Tool Execution

OpenCanary: Detect NMAP OS Scan Targets via Application Logtype 5002

Pivot detection · T1046 · 9 related

Changelog

v5
Candidate ingested via manual entry.2026-07-31
v4
Candidate ingested via manual entry.2026-07-31
v3
Candidate ingested via manual entry.2026-07-31
v2
Candidate ingested via manual entry.2026-07-31
v1
No changelog recorded for this version.2026-07-30

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

opencanary-nmap-os-scan-targeting-via-application-logtype-5002-e8a677fd

title: "OpenCanary: Detect NMAP OS Scan Targets via Application Logtype 5002"
id: 3c25c156-c7ac-47fc-b6f4-3fd124af6cc0
status: experimental
description: This rule identifies when an OpenCanary honeypot records an event indicating it was targeted by an NMAP OS scan. Fingerprinting services with OS detection can support later exploitation by revealing likely platforms and software versions. The detection relies on OpenCanary application telemetry, specifically log entries with logtype 5002.
references:
  - https://opencanary.readthedocs.io/en/latest/starting/configuration.html#services-configuration
  - https://github.com/thinkst/opencanary/blob/a0896adfcaf0328cfd5829fe10d2878c7445138e/opencanary/logger.py#L52
  - https://github.com/SigmaHQ/sigma/blob/master/rules/application/opencanary/opencanary_portscan_nmap_os_scan.yml
author: Marco Pedrinazzi (@pedrinazziM), Huntrule Team
date: 2026-01-06
tags:
  - attack.discovery
  - attack.t1046
logsource:
  category: application
  product: opencanary
detection:
  selection:
    logtype: 5002
  condition: selection
falsepositives:
  - Unlikely
level: high
license: DRL-1.1
related:
  - id: e8a677fd-248c-4eab-94df-de2f6f645884
    type: derived

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