Unusual Child Process of dns.exe — Sigma Rule

Rule metadata and linked tags

Author: Tim Rauch, Elastic (idea). Source status: test; severity: high. Source dates: 2022-09-27 / 2023-02-05.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 0d7c4496c2b09e2ea37abb6b8a362534952d87b8afde79c9097aa6676bcac991

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: Unusual Child Process of dns.exe
id: a4e3d776-f12e-42c2-8510-9e6ed1f43ec3
status: test
description: Detects an unexpected process spawning from dns.exe which may indicate activity related to remote code execution or other forms of exploitation as seen in CVE-2020-1350 (SigRed)
references:
    - https://www.elastic.co/guide/en/security/current/unusual-child-process-of-dns-exe.html
author: Tim Rauch, Elastic (idea)
date: 2022-09-27
modified: 2023-02-05
tags:
    - attack.persistence
    - attack.initial-access
    - attack.t1133
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        ParentImage|endswith: '\dns.exe'
    filter:
        Image|endswith: '\conhost.exe'
    condition: selection and not filter
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://www.elastic.co/guide/en/security/current/unusual-child-process-of-dns-exe.html