Uncommon Child Process Of Conhost.EXE — Sigma Rule

Rule metadata and linked tags

Author: omkar72. Source status: test; severity: medium. Source dates: 2020-10-25 / 2023-12-11.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 7323944b5dc2948e283fefb81e61f091a95f9661f36eb4e97228c53aa5555dbc

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 Child Process Of Conhost.EXE
id: 7dc2dedd-7603-461a-bc13-15803d132355
related:
    - id: dfa03a09-8b92-4d83-8e74-f72839b1c407
      type: similar
status: test
description: Detects uncommon "conhost" child processes. This could be a sign of "conhost" usage as a LOLBIN or potential process injection activity.
references:
    - http://www.hexacorn.com/blog/2020/05/25/how-to-con-your-host/
author: omkar72
date: 2020-10-25
modified: 2023-12-11
tags:
    - attack.stealth
    - attack.t1202
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        ParentImage|endswith: '\conhost.exe'
    filter_main_conhost:
        Image|endswith: ':\Windows\System32\conhost.exe'
    filter_main_null:
        Image: null
    filter_main_empty:
        Image: ''
    filter_optional_provider:
        Provider_Name: 'SystemTraceProvider-Process'  # Race condition with SystemTrace doesn't provide all fields.
    condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• http://www.hexacorn.com/blog/2020/05/25/how-to-con-your-host/