Uncommon Svchost Parent Process — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems). Source status: test; severity: medium. Source dates: 2017-08-15 / 2022-06-28.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: d97c736fd54603417885715be656aa0433b079c87ce82b09ef697a519de13b48

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: Uncommon Svchost Parent Process
id: 01d2e2a1-5f09-44f7-9fc1-24faa7479b6d
status: test
description: Detects an uncommon svchost parent process
references:
    - Internal Research
author: Florian Roth (Nextron Systems)
date: 2017-08-15
modified: 2022-06-28
tags:
    - attack.stealth
    - attack.t1036.005
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith: '\svchost.exe'
    filter_main_generic:
        ParentImage|endswith:
            - '\Mrt.exe'
            - '\MsMpEng.exe'
            - '\ngen.exe'
            - '\rpcnet.exe'
            - '\services.exe'
            - '\TiWorker.exe'
    filter_main_parent_null:
        ParentImage: null
    filter_main_parent_empty:
        ParentImage:
            - '-'
            - ''
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• Internal Research (source note; no public URL supplied)