Browser Execution In Headless Mode — Sigma Rule

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: low. Source dates: 2023-09-12 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 45c33efa86a8de595a80fde45f0c945376b5c2e40923311088927d0d131af7cc

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: Browser Execution In Headless Mode
id: ef9dcfed-690c-4c5d-a9d1-482cd422225c
related:
    - id: 0e8cfe08-02c9-4815-a2f8-0d157b7ed33e
      type: derived
status: test
description: Detects execution of Chromium based browser in headless mode
references:
    - https://twitter.com/mrd0x/status/1478234484881436672?s=12
    - https://www.trendmicro.com/en_us/research/23/e/managed-xdr-investigation-of-ducktail-in-trend-micro-vision-one.html
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-09-12
tags:
    - attack.command-and-control
    - attack.stealth
    - attack.t1105
    - attack.t1564.003
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\brave.exe'
            - '\chrome.exe'
            - '\msedge.exe'
            - '\opera.exe'
            - '\vivaldi.exe'
        CommandLine|contains: '--headless'
    condition: selection
falsepositives:
    - Unknown
level: low

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://twitter.com/mrd0x/status/1478234484881436672?s=12
• https://www.trendmicro.com/en_us/research/23/e/managed-xdr-investigation-of-ducktail-in-trend-micro-vision-one.html