Wannacry Killswitch Domain — Sigma Rule

Rule metadata and linked tags

Author: Mike Wade. Source status: test; severity: high. Source dates: 2020-09-16 / 2022-03-24.

{
  "category": "dns"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: ffe9f06fa10ede2bdff7d7c0a31910e81dd2d7ab97f85ce097b7d5197e785fba

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: Wannacry Killswitch Domain
id: 3eaf6218-3bed-4d8a-8707-274096f12a18
status: test
description: Detects wannacry killswitch domain dns queries
references:
    - https://www.mandiant.com/resources/blog/wannacry-ransomware-campaign
author: Mike Wade
date: 2020-09-16
modified: 2022-03-24
tags:
    - attack.command-and-control
    - attack.t1071.001
logsource:
    category: dns
detection:
    selection:
        query:
            - 'ifferfsodp9ifjaposdfjhgosurijfaewrwergwea.testing'
            - 'ifferfsodp9ifjaposdfjhgosurijfaewrwergwea.test'
            - 'ifferfsodp9ifjaposdfjhgosurijfaewrwergwea.com'
            - 'ayylmaotjhsstasdfasdfasdfasdfasdfasdfasdf.com'
            - 'iuqssfsodp9ifjaposdfjhgosurijfaewrwergwea.com'
    condition: selection
falsepositives:
    - Analyst testing
level: high

Original YAML and metadata in JSON

False positives

• Analyst testing

Source references

• https://www.mandiant.com/resources/blog/wannacry-ransomware-campaign