Sigma rule: DNS TOR Proxies

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-cf93318d6262, updated 2025-09-12T00:00:00.000Z.

Rule

Title: DNS TOR Proxies
Status: test
Level: medium
Author: Saw Winn Naung , Azure-Sentinel
Date: 2021-08-15
Modified: 2025-09-12
File: rules/network/zeek/zeek_dns_torproxy.yml
Commit: ccbb0369507f796db0b0ae6854c8a2be471b9d84

Identifies IPs performing DNS lookups associated with common Tor proxies.

Log source

product: zeek
service: dns

Detection

selection:
    query|endswith:
        - '.hiddenservice.net'
        - '.onion.ca'
        - '.onion.cab'
        - '.onion.casa'
        - '.onion.city'
        - '.onion.direct'
        - '.onion.dog'
        - '.onion.glass'
        - '.onion.gq'
        - '.onion.guide'
        - '.onion.in.net'
        - '.onion.ink'
        - '.onion.it'
        - '.onion.link'
        - '.onion.lt'
        - '.onion.lu'
        - '.onion.ly'
        - '.onion.mn'
        - '.onion.network'
        - '.onion.nu'
        - '.onion.pet'
        - '.onion.plus'
        - '.onion.pt'
        - '.onion.pw'
        - '.onion.rip'
        - '.onion.sh'
        - '.onion.si'
        - '.onion.to'
        - '.onion.top'
        - '.onion.ws'
        - '.onion'
        - '.s1.tor-gateways.de'
        - '.s2.tor-gateways.de'
        - '.s3.tor-gateways.de'
        - '.s4.tor-gateways.de'
        - '.s5.tor-gateways.de'
        - '.t2w.pw'
        - '.tor2web.ae.org'
        - '.tor2web.blutmagie.de'
        - '.tor2web.com'
        - '.tor2web.fi'
        - '.tor2web.io'
        - '.tor2web.org'
        - '.tor2web.xyz'
        - '.torlink.co'
condition: selection

False positives (as the rule lists them)

Unknown

MITRE ATT&CK ids this rule names

T1048

Related rules

References

https://github.com/Azure/Azure-Sentinel/blob/f99542b94afe0ad2f19a82cc08262e7ac8e1428e/Detections/ASimDNS/imDNS_TorProxies.yaml

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

Sources and licences

SigmaHQ
"DNS TOR Proxies" by Saw Winn Naung , Azure-Sentinel (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/network/zeek/zeek_dns_torproxy.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: DNS TOR Proxies",
entity page, dataset version ref-cf93318d6262, updated 2025-09-12T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/a8322756-015c-42e7-afb1-436e85ed3ff5 (accessed 2026-11-03).
Underlying source: SigmaHQ rule a8322756-015c-42e7-afb1-436e85ed3ff5, 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.