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Detection rules › Sigma

DNS Query Tor .Onion Address - Sysmon

Status
test
Severity
high
Log source
category dns_query, product windows
Author
frack113
Source
github.com/SigmaHQ/sigma

Detects DNS queries to an ".onion" address related to Tor routing networks

MITRE ATT&CK coverage

TacticTechniques
Command & Control

Telemetry coverage

ProviderRecord / event type
SysmonEvent ID 22: DNSEvent (DNS query)

Rule body

title: DNS Query Tor .Onion Address - Sysmon
id: b55ca2a3-7cff-4dda-8bdd-c7bfa63bf544
related:
    - id: 8384bd26-bde6-4da9-8e5d-4174a7a47ca2
      type: similar
    - id: a8322756-015c-42e7-afb1-436e85ed3ff5
      type: similar
status: test
description: Detects DNS queries to an ".onion" address related to Tor routing networks
references:
    - https://www.logpoint.com/en/blog/detecting-tor-use-with-logpoint/
    - https://github.com/Azure/Azure-Sentinel/blob/f99542b94afe0ad2f19a82cc08262e7ac8e1428e/Detections/ASimDNS/imDNS_TorProxies.yaml
author: frack113
date: 2022-02-20
modified: 2025-09-12
tags:
    - attack.command-and-control
    - attack.t1090.003
logsource:
    product: windows
    category: dns_query
detection:
    selection:
        QueryName|endswith:
            - '.hiddenservice.net'
            - '.onion.ca'
            - '.onion.cab'
            - '.onion.casa'
            - '.onion.city'
            - '.onion.direct'
            - '.onion.dog'
            - '.onion.glass'
            - '.onion.gq'
            - '.onion.ink'
            - '.onion.it'
            - '.onion.link'
            - '.onion.lt'
            - '.onion.lu'
            - '.onion.nu'
            - '.onion.pet'
            - '.onion.plus'
            - '.onion.rip'
            - '.onion.sh'
            - '.onion.to'
            - '.onion.top'
            - '.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
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    QueryName|endswith:
        - '.hiddenservice.net'
        - '.onion.ca'
        - '.onion.cab'
        - '.onion.casa'
        - '.onion.city'
        - '.onion.direct'
        - '.onion.dog'
        - '.onion.glass'
        - '.onion.gq'
        - '.onion.ink'
        - '.onion.it'
        - '.onion.link'
        - '.onion.lt'
        - '.onion.lu'
        - '.onion.nu'
        - '.onion.pet'
        - '.onion.plus'
        - '.onion.rip'
        - '.onion.sh'
        - '.onion.to'
        - '.onion.top'
        - '.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'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
QueryNameends_with
  • .hiddenservice.net corpus 2 (sigma 2)
  • .onion corpus 3 (sigma 2, elastic 1)
  • .onion.ca corpus 2 (sigma 2)
  • .onion.cab corpus 2 (sigma 2)
  • .onion.casa corpus 2 (sigma 2)
  • .onion.city corpus 2 (sigma 2)
  • .onion.direct corpus 2 (sigma 2)
  • .onion.dog corpus 2 (sigma 2)
  • .onion.glass corpus 2 (sigma 2)
  • .onion.gq corpus 2 (sigma 2)
  • .onion.ink corpus 2 (sigma 2)
  • .onion.it corpus 2 (sigma 2)
  • .onion.link corpus 2 (sigma 2)
  • .onion.lt corpus 2 (sigma 2)
  • .onion.lu corpus 2 (sigma 2)
  • .onion.nu corpus 2 (sigma 2)
  • .onion.pet corpus 2 (sigma 2)
  • .onion.plus corpus 2 (sigma 2)
  • .onion.rip corpus 2 (sigma 2)
  • .onion.sh corpus 2 (sigma 2)
  • .onion.to corpus 2 (sigma 2)
  • .onion.top corpus 2 (sigma 2)
  • .s1.tor-gateways.de corpus 2 (sigma 2)
  • .s2.tor-gateways.de corpus 2 (sigma 2)
  • .s3.tor-gateways.de corpus 2 (sigma 2)
  • .s4.tor-gateways.de corpus 2 (sigma 2)
  • .s5.tor-gateways.de corpus 2 (sigma 2)
  • .t2w.pw corpus 2 (sigma 2)
  • .tor2web.ae.org corpus 2 (sigma 2)
  • .tor2web.blutmagie.de corpus 2 (sigma 2)
  • .tor2web.com corpus 2 (sigma 2)
  • .tor2web.fi corpus 2 (sigma 2)
  • .tor2web.io corpus 2 (sigma 2)
  • .tor2web.org corpus 2 (sigma 2)
  • .tor2web.xyz corpus 2 (sigma 2)
  • .torlink.co corpus 2 (sigma 2)
field:"QueryName" kind:ends_with