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Detectionhightest

DNS Query Tor .Onion Address - Sysmon

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

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François HubautCreated Sun Feb 20Updated Fri Sep 12b55ca2a3-7cff-4dda-8bdd-c7bfa63bf544windows
Log Source
WindowsDNS Query
ProductWindows← raw: windows
CategoryDNS Query← raw: dns_query

DNS lookup events generated by endpoint monitoring tools.

Detection Logic
Detection Logic1 selector
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
False Positives
Unknown

False positive likelihood has not been assessed. Additional context may be needed during triage.

References
1
Resolving title…
logpoint.com
2
Resolving title…
github.com
MITRE ATT&CK
Related Rules
SimilarDetectionhigh

Query Tor Onion Address - DNS Client

Detects DNS resolution of an .onion address related to Tor routing networks

Detects similar activity. Both rules may fire on overlapping events.

SimilarDetectionmedium

DNS TOR Proxies

Identifies IPs performing DNS lookups associated with common Tor proxies.

Detects similar activity. Both rules may fire on overlapping events.

Rule Metadata
Rule ID
b55ca2a3-7cff-4dda-8bdd-c7bfa63bf544
Status
test
Level
high
Type
Detection
Created
Sun Feb 20
Modified
Fri Sep 12
Author
François Hubaut
Path
rules/windows/dns_query/dns_query_win_tor_onion_domain_query.yml
Raw Tags
attack.command-and-controlattack.t1090.003
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