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The public catalogue of detection rules. Every entry carries its source, the identifier it had there, its licence and its ATT&CK mapping.

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MediumΣSigmaHQ

Network Connection Initiated To Cloudflared Tunnels Domains

Detects network connections to Cloudflared tunnels domains initiated by a process on the system. Attackers can abuse that feature to establish a reverse shell or persistence on a machine.

ATT&CK coverage

Command and Control

T1572Protocol Tunneling 60 detections cover this technique

Exfiltration

T1567Exfiltration Over Web Service 45 detections cover this technique

Detection requirements

Log source product: windows
Log source category: network_connection

Detection logic

Published to signed-in readers

The query as its source wrote it, its canonical form, and the content hash that pins this exact revision.

Provenance

Where this detection came from, and what you may do with it.

At source: Open at source
Written by: Kamran Saifullah
Nasreddine Bencherchali (Nextron Systems)
Licence: Detection Rule License 1.1Read the licence
Published: Aug 26, 2026
Version: 1