Sigma rule: New PortProxy Registry Entry Added

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-9624c5059c2f, updated 2024-03-25T00:00:00.000Z.

Rule

Title
New PortProxy Registry Entry Added
Status
test
Level
medium
Author
Andreas Hunkeler (@Karneades)
Date
2021-06-22
Modified
2024-03-25
File
rules/windows/registry/registry_event/registry_event_portproxy_registry_key.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects the modification of the PortProxy registry key which is used for port forwarding.

Log source

product
windows
category
registry_event

Detection

selection:
    # Example: HKLM\System\CurrentControlSet\Services\PortProxy\v4tov4\tcp\0.0.0.0/1337
    TargetObject|contains: '\Services\PortProxy\v4tov4\tcp\'
condition: selection

False positives (as the rule lists them)

  • WSL2 network bridge PowerShell script used for WSL/Kubernetes/Docker (e.g. https://github.com/microsoft/WSL/issues/4150#issuecomment-504209723)
  • Synergy Software KVM (https://symless.com/synergy)

Tags

  • attack.lateral-movement
  • attack.command-and-control
  • attack.t1090

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/registry/registry_event/registry_event_portproxy_registry_key.yml

Sources and licences

  • SigmaHQ

    "New PortProxy Registry Entry Added" by Andreas Hunkeler (@Karneades) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/registry/registry_event/registry_event_portproxy_registry_key.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: New PortProxy Registry Entry Added",
entity page, dataset version ref-9624c5059c2f, updated 2024-03-25T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/a54f842a-3713-4b45-8c84-5f136fdebd3c (accessed 2026-11-03).
Underlying source: SigmaHQ rule a54f842a-3713-4b45-8c84-5f136fdebd3c, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.