DNS Query to External Service Interaction Domains — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems), Matt Kelly (list of domains). Source status: test; severity: high. Source dates: 2022-06-07 / 2026-01-24.

{
  "category": "dns"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 275ca1c0db582eccaacd35c9e3c4b5660c82cedafea65808795997708ee3a482

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

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

Original YAML and metadata in JSON

False positives

• Legitimate security scanning.

Source 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