Suspicious DNS Query for IP Lookup Service APIs — Sigma Rule

Rule metadata and linked tags

Author: Brandon George (blog post), Thomas Patzke. Source status: test; severity: medium. Source dates: 2021-07-08 / 2024-03-22.

{
  "product": "windows",
  "category": "dns_query"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: d7a856d036daacafcb331dade4769562a84e946a105479ae3c864f579d2c675d

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: Suspicious DNS Query for IP Lookup Service APIs
id: ec82e2a5-81ea-4211-a1f8-37a0286df2c2
status: test
description: Detects DNS queries for IP lookup services such as "api.ipify.org" originating from a non browser process.
references:
    - https://www.binarydefense.com/analysis-of-hancitor-when-boring-begets-beacon
    - https://twitter.com/neonprimetime/status/1436376497980428318
    - https://www.trendmicro.com/en_us/research/23/e/managed-xdr-investigation-of-ducktail-in-trend-micro-vision-one.html
author: Brandon George (blog post), Thomas Patzke
date: 2021-07-08
modified: 2024-03-22
tags:
    - attack.reconnaissance
    - attack.t1590
logsource:
    product: windows
    category: dns_query
detection:
    selection:
        - QueryName:
              - 'www.ip.cn'
              - 'l2.io'
        - QueryName|contains:
              - 'api.2ip.ua'
              - 'api.bigdatacloud.net'
              - 'api.ipify.org'
              - 'bot.whatismyipaddress.com'
              - 'canireachthe.net'
              - 'checkip.amazonaws.com'
              - 'checkip.dyndns.org'
              - 'curlmyip.com'
              - 'db-ip.com'
              - 'edns.ip-api.com'
              - 'eth0.me'
              - 'freegeoip.app'
              - 'geoipy.com'
              - 'getip.pro'
              - 'icanhazip.com'
              - 'ident.me'
              - 'ifconfig.io'
              - 'ifconfig.me'
              - 'ip-api.com'
              - 'ip.360.cn'
              - 'ip.anysrc.net'
              - 'ip.taobao.com'
              - 'ip.tyk.nu'
              - 'ipaddressworld.com'
              - 'ipapi.co'
              - 'ipconfig.io'
              - 'ipecho.net'
              - 'ipinfo.io'
              - 'ipip.net'
              - 'ipof.in'
              - 'ipv4.icanhazip.com'
              - 'ipv4bot.whatismyipaddress.com'
              - 'ipv6-test.com'
              - 'ipwho.is'
              - 'jsonip.com'
              - 'myexternalip.com'
              - 'seeip.org'
              - 'wgetip.com'
              - 'whatismyip.akamai.com'
              - 'whois.pconline.com.cn'
              - 'wtfismyip.com'
    filter_optional_brave:
        Image|endswith: '\brave.exe'
    filter_optional_chrome:
        Image:
            - 'C:\Program Files\Google\Chrome\Application\chrome.exe'
            - 'C:\Program Files (x86)\Google\Chrome\Application\chrome.exe'
    filter_optional_firefox:
        Image:
            - 'C:\Program Files\Mozilla Firefox\firefox.exe'
            - 'C:\Program Files (x86)\Mozilla Firefox\firefox.exe'
    filter_optional_ie:
        Image:
            - 'C:\Program Files (x86)\Internet Explorer\iexplore.exe'
            - 'C:\Program Files\Internet Explorer\iexplore.exe'
    filter_optional_maxthon:
        Image|endswith: '\maxthon.exe'
    filter_optional_edge_1:
        - Image|startswith: 'C:\Program Files (x86)\Microsoft\EdgeWebView\Application\'
        - Image|endswith: '\WindowsApps\MicrosoftEdge.exe'
        - Image:
              - 'C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe'
              - 'C:\Program Files\Microsoft\Edge\Application\msedge.exe'
    filter_optional_edge_2:
        Image|startswith:
            - 'C:\Program Files (x86)\Microsoft\EdgeCore\'
            - 'C:\Program Files\Microsoft\EdgeCore\'
        Image|endswith:
            - '\msedge.exe'
            - '\msedgewebview2.exe'
    filter_optional_opera:
        Image|endswith: '\opera.exe'
    filter_optional_safari:
        Image|endswith: '\safari.exe'
    filter_optional_seamonkey:
        Image|endswith: '\seamonkey.exe'
    filter_optional_vivaldi:
        Image|endswith: '\vivaldi.exe'
    filter_optional_whale:
        Image|endswith: '\whale.exe'
    condition: selection and not 1 of filter_optional_*
falsepositives:
    - Legitimate usage of IP lookup services such as ipify API
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate usage of IP lookup services such as ipify API

Source references

• https://www.binarydefense.com/analysis-of-hancitor-when-boring-begets-beacon
• https://twitter.com/neonprimetime/status/1436376497980428318
• https://www.trendmicro.com/en_us/research/23/e/managed-xdr-investigation-of-ducktail-in-trend-micro-vision-one.html