Browser Started with Remote Debugging — Sigma Rule

Rule metadata and linked tags

Author: pH-T (Nextron Systems), Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: medium. Source dates: 2022-07-27 / 2022-12-23.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 716b427a1354e772ef0fff3a7d623b93f19d96a4972e573f4ac6091689fa139e

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 Started with Remote Debugging
id: b3d34dc5-2efd-4ae3-845f-8ec14921f449
related:
    - id: 3e8207c5-fcd2-4ea6-9418-15d45b4890e4
      type: derived
status: test
description: Detects browsers starting with the remote debugging flags. Which is a technique often used to perform browser injection attacks
references:
    - https://yoroi.company/wp-content/uploads/2022/05/EternityGroup_report_compressed.pdf
    - https://www.mdsec.co.uk/2022/10/analysing-lastpass-part-1/
    - https://github.com/defaultnamehere/cookie_crimes/
    - https://github.com/wunderwuzzi23/firefox-cookiemonster
author: pH-T (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)
date: 2022-07-27
modified: 2022-12-23
tags:
    - attack.credential-access
    - attack.collection
    - attack.t1185
logsource:
    category: process_creation
    product: windows
detection:
    selection_chromium_based:
        # Covers: --remote-debugging-address, --remote-debugging-port, --remote-debugging-socket-name, --remote-debugging-pipe....etc
        CommandLine|contains: ' --remote-debugging-'
    selection_firefox:
        Image|endswith: '\firefox.exe'
        CommandLine|contains: ' -start-debugger-server'
    condition: 1 of selection_*
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://yoroi.company/wp-content/uploads/2022/05/EternityGroup_report_compressed.pdf
• https://www.mdsec.co.uk/2022/10/analysing-lastpass-part-1/
• https://github.com/defaultnamehere/cookie_crimes/
• https://github.com/wunderwuzzi23/firefox-cookiemonster