DNS Query to External Service Interaction Domains

Status: test
Severity: high
Log source: category dns
Author: Florian Roth (Nextron Systems), Matt Kelly (list of domains)
Source: github.com/SigmaHQ/sigma

Detects suspicious DNS queries to external service interaction domains often used for out-of-band interactions after successful RCE

MITRE ATT&CK coverage

Tactic	Techniques
Reconnaissance	`T1595.002` Active Scanning: Vulnerability Scanning
Initial Access	`T1190` Exploit Public-Facing Application

Rule body yaml

title: DNS Query to External Service Interaction Domains
id: aff715fa-4dd5-497a-8db3-910bea555566
status: test
description: |
    Detects suspicious DNS queries to external service interaction domains often used for out-of-band interactions after successful RCE
references:
    - https://twitter.com/breakersall/status/1533493587828260866
    - https://www.bitdefender.com/en-us/blog/businessinsights/bitdefender-advisory-critical-unauthenticated-rce-windows-server-update-services-cve-2025-59287
    - https://github.com/SigmaHQ/sigma/pull/5724#issuecomment-3466382234
author: Florian Roth (Nextron Systems), Matt Kelly (list of domains)
date: 2022-06-07
modified: 2026-01-24
tags:
    - attack.initial-access
    - attack.t1190
    - attack.reconnaissance
    - attack.t1595.002
logsource:
    category: dns
detection:
    selection:
        query|endswith:
            - '.burpcollaborator.net' # Portswigger Burpsuite Collaborator
            - '.canarytokens.com' # Thinkst Canary Canarytokens
            - '.ceye.io'
            - '.ddns.1443.eu.org' # dig.pm
            - '.ddns.bypass.eu.org' # dig.pm
            - '.ddns.xn--gg8h.eu.org' # dig.pm
            - '.digimg.store' # dnslog.ink
            - '.dns.su18.org' # javaweb.org
            - '.dnshook.site' # webhook.site
            - '.dnslog.cn'
            - '.dnslog.ink' # dnslog.ink
            - '.instances.httpworkbench.com' # httpworkbench.com
            - '.interact.sh' # Project Discovery Interactsh
            - '.log.dnslog.pp.ua' # dnslog.org
            - '.log.dnslog.qzz.io' # dnslog.org
            - '.log.dnslogs.dpdns.org' # dnslog.org
            - '.log.javaweb.org' # javaweb.org
            - '.log.nat.cloudns.ph' # dnslog.org
            - '.oast.fun' # Project Discovery Interactsh
            - '.oast.live' # Project Discovery Interactsh
            - '.oast.me' # Project Discovery Interactsh
            - '.oast.online' # Project Discovery Interactsh
            - '.oast.pro' # Project Discovery Interactsh
            - '.oast.site' # Project Discovery Interactsh
            - '.oastify.com' # Portswigger Burpsuite Collaborator
            - '.p8.lol' # javaweb.org
            - '.requestbin.net'
    filter_main_polling:
        query|contains: 'polling.oastify.com'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Legitimate security scanning.
level: high

Stages and Predicates

Stage 0: `condition`

selection and not 1 of filter_main_*

Stage 1: `selection`

selection:
    query|endswith:
        - '.burpcollaborator.net'
        - '.canarytokens.com'
        - '.ceye.io'
        - '.ddns.1443.eu.org'
        - '.ddns.bypass.eu.org'
        - '.ddns.xn--gg8h.eu.org'
        - '.digimg.store'
        - '.dns.su18.org'
        - '.dnshook.site'
        - '.dnslog.cn'
        - '.dnslog.ink'
        - '.instances.httpworkbench.com'
        - '.interact.sh'
        - '.log.dnslog.pp.ua'
        - '.log.dnslog.qzz.io'
        - '.log.dnslogs.dpdns.org'
        - '.log.javaweb.org'
        - '.log.nat.cloudns.ph'
        - '.oast.fun'
        - '.oast.live'
        - '.oast.me'
        - '.oast.online'
        - '.oast.pro'
        - '.oast.site'
        - '.oastify.com'
        - '.p8.lol'
        - '.requestbin.net'

Stage 2: `not filter_main_polling`

filter_main_polling:
    query|contains: 'polling.oastify.com'

Exclusions

Top-level NOT(...) conjuncts: predicates this rule actively suppresses.

Field	Kind	Excluded values
`query`	match	`polling.oastify.com`

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	`.burpcollaborator.net` `.canarytokens.com` `.ceye.io` `.ddns.1443.eu.org` `.ddns.bypass.eu.org` `.ddns.xn--gg8h.eu.org` `.digimg.store` `.dns.su18.org` `.dnshook.site` `.dnslog.cn` `.dnslog.ink` `.instances.httpworkbench.com` `.interact.sh` `.log.dnslog.pp.ua` `.log.dnslog.qzz.io` `.log.dnslogs.dpdns.org` `.log.javaweb.org` `.log.nat.cloudns.ph` `.oast.fun` `.oast.live` `.oast.me` `.oast.online` `.oast.pro` `.oast.site` `.oastify.com` `.p8.lol` `.requestbin.net`

`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 Query to External Service Interaction Domains

MITRE ATT&CK coverage

Rule body yaml

Stages and Predicates

Stage 0: `condition`

Stage 1: `selection`

Stage 2: `not filter_main_polling`

Exclusions

Indicators

Keyboard shortcuts

Search operators

DNS Query to External Service Interaction Domains

MITRE ATT&CK coverage

Rule body yaml

Stages and Predicates

Stage 0: condition

Stage 1: selection

Stage 2: not filter_main_polling

Exclusions

Indicators

Stage 0: `condition`

Stage 1: `selection`

Stage 2: `not filter_main_polling`