DNS TOR Proxies

Status: test
Severity: medium
Log source: product zeek, service dns
Author: Saw Winn Naung , Azure-Sentinel
Source: github.com/SigmaHQ/sigma

Identifies IPs performing DNS lookups associated with common Tor proxies.

MITRE ATT&CK coverage

Tactic	Techniques
Exfiltration	`T1048` Exfiltration Over Alternative Protocol

Rule body yaml

title: DNS TOR Proxies
id: a8322756-015c-42e7-afb1-436e85ed3ff5
related:
    - id: b55ca2a3-7cff-4dda-8bdd-c7bfa63bf544
      type: similar
    - id: 8384bd26-bde6-4da9-8e5d-4174a7a47ca2
      type: similar
status: test
description: Identifies IPs performing DNS lookups associated with common Tor proxies.
references:
    - https://github.com/Azure/Azure-Sentinel/blob/f99542b94afe0ad2f19a82cc08262e7ac8e1428e/Detections/ASimDNS/imDNS_TorProxies.yaml
author: Saw Winn Naung , Azure-Sentinel
date: 2021-08-15
modified: 2025-09-12
tags:
    - attack.exfiltration
    - attack.t1048
logsource:
    service: dns
    product: zeek
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
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

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'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

Field	Kind	Values
`query`	ends_with	`.hiddenservice.net` `.onion` `.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` `.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`

`j` / `k`	Scroll down / up
`d` / `u`	Half-page down / up
`gg` / `G`	Top / bottom
`h` / `l`	History back / forward
`f`	Follow link (`Shift` = new tab)
`/`	Focus search
`?`	Toggle this help
`↑` / `↓`	Navigate search results
`Enter`	Open highlighted result
`Esc`	Close results / dialog

`type:`	`events` / `rules` / `providers`
`vendor:`	`sigma` / `elastic` / `splunk` / `kusto` / `chronicle` (vendor name alone also works: `sigma:`, `kql:`, `secops:`…)
`tactic:`	TA-id, slug, or name: `credential_access`, `TA0006`
`technique:`	technique or sub-technique ID: `T1003`, `T1003.001` (alias `tech:`)
`severity:`	`critical` / `high` / `medium` / `low` / `informational` (alias `sev:`)
`risk_score`	Numeric comparison on the Elastic risk score (0 to 100): `risk_score>50`, `risk_score<=20`, `risk_score=99` (alias `risk`; Elastic rules only)
`stages:`	Rules with exactly N pipeline stages
`correlation:`	`single_event` / `sequence` / `alternatives` / `alternatives_cross_log` / `all_required` / `correlated`
`with:`	Co-occurrence event-id; stacks (`with:4624 with:4769`) to require all, while a comma list in one occurrence (`with:4624,4769`) is an either-or group. Implies multi-event
`like:`	Structural neighbors of a rule slug (equivalents + subsumption stricter / broader): `like:comsvcs_lsass_memory_dump-splunk-sysmon`
`groupby:`	Entity-grouping substring match against `group_by_keys`: `groupby:user`, `groupby:host`
`uses:`	Rules whose predicate tree touches the field (any kind, any value): `uses:CommandLine`
`excludes:`	Rules with top-level `not()` clauses on the field (FP whitelists): `excludes:ParentImage`
`field:` / `value:`	Predicate search; narrows rule cards to those with a matching leaf and drives the indicator tier. Unquoted = substring, wildcards allowed (`value:mimikatz`)
`indicator:`	Shorthand for `field:F value:V`: `indicator:Image=*\powershell.exe`
`kind:`	Filter by predicate kind. Narrows rule cards to those carrying a matching predicate leaf (`vendor:elastic kind:cidr_match`) and drives the indicator tier: `contains` / `starts_with` / `ends_with` / `regex` / `cidr` / `eq` / `in` … (operator aliases `op:`/`match:`)
`has:` / `no:`	`sample`, `field`, `notes`, `refs`, `trace`, `thirdparty`, `rule`, `pattern`, `timewindow`, `threshold`, `newterms`, `sigma`/`elastic`/`splunk`/`kusto`/`chronicle`
`-op:val`	Exclude matches; works on most operators but not `type:`/`like:`/`has:`/`no:` (use `no:<flag>` to exclude a rule flag): `tactic:execution -vendor:splunk`. Standalone `-kind:`/`-field:`/`-value:` drop every rule carrying a matching predicate leaf (`type:rules -kind:is_null`)
`field:"…"` / `value:"…"`	Quoted value = anchored exact match (also allows spaces): `value:"net user"`
`a,b`	Comma = OR inside one operator (`vendor:sigma,elastic`, `severity:high,critical`); repeating a facet merges the same way. `field:`/`value:` never split (literal commas)
`vendors:` / `stage:`	Singular and plural spellings fold to the canonical operator and value: `tactics:` = `tactic:`, `type:event` = `type:events`, `correlation:sequences` = `correlation:sequence`, `has:thresholds` = `has:threshold`
`"quoted phrase"`	Exact-match a multi-word phrase (free text)

DNS TOR Proxies

MITRE ATT&CK coverage

Rule body yaml

Stages and Predicates

Stage 0: `condition`

Stage 1: `selection`

Indicators

Keyboard shortcuts

Search operators

DNS TOR Proxies

MITRE ATT&CK coverage

Rule body yaml

Stages and Predicates

Stage 0: condition

Stage 1: selection

Indicators

Stage 0: `condition`

Stage 1: `selection`