Sigma rule: Communication To Ngrok Tunneling Service - Linux

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-bc96b1a289f3, updated 2022-11-03T00:00:00.000Z.

Rule

Title
Communication To Ngrok Tunneling Service - Linux
Status
test
Level
high
Author
Florian Roth (Nextron Systems)
Date
2022-11-03
File
rules/linux/network_connection/net_connection_lnx_ngrok_tunnel.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects an executable accessing an ngrok tunneling endpoint, which could be a sign of forbidden exfiltration of data exfiltration by malicious actors

Log source

product
linux
category
network_connection

Detection

selection:
    DestinationHostname|contains:
        - 'tunnel.us.ngrok.com'
        - 'tunnel.eu.ngrok.com'
        - 'tunnel.ap.ngrok.com'
        - 'tunnel.au.ngrok.com'
        - 'tunnel.sa.ngrok.com'
        - 'tunnel.jp.ngrok.com'
        - 'tunnel.in.ngrok.com'
condition: selection

False positives (as the rule lists them)

  • Legitimate use of ngrok

Tags

  • attack.exfiltration
  • attack.command-and-control
  • attack.t1567
  • attack.t1568.002
  • attack.t1572
  • attack.t1090
  • attack.t1102
  • attack.s0508

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/linux/network_connection/net_connection_lnx_ngrok_tunnel.yml

Sources and licences

  • SigmaHQ

    "Communication To Ngrok Tunneling Service - Linux" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/linux/network_connection/net_connection_lnx_ngrok_tunnel.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: Communication To Ngrok Tunneling Service - Linux",
entity page, dataset version ref-bc96b1a289f3, updated 2022-11-03T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/19bf6fdb-7721-4f3d-867f-53467f6a5db6 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 19bf6fdb-7721-4f3d-867f-53467f6a5db6, 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.