sigmamediumHunting

Potentially Suspicious Electron Application CommandLine

Detects potentially suspicious CommandLine of electron apps (teams, discord, slack, etc.). This could be a sign of abuse to proxy execution through a signed binary.

Detection Query

selection_img:
  - Image|endswith:
      - \chrome.exe
      - \code.exe
      - \discord.exe
      - \GitHubDesktop.exe
      - \keybase.exe
      - \msedge_proxy.exe
      - \msedge.exe
      - \msedgewebview2.exe
      - \msteams.exe
      - \slack.exe
      - \Teams.exe
  - OriginalFileName:
      - chrome.exe
      - code.exe
      - discord.exe
      - GitHubDesktop.exe
      - keybase.exe
      - msedge_proxy.exe
      - msedge.exe
      - msedgewebview2.exe
      - msteams.exe
      - slack.exe
      - Teams.exe
selection_cli:
  CommandLine|contains:
    - --browser-subprocess-path
    - --gpu-launcher
    - --renderer-cmd-prefix
    - --utility-cmd-prefix
condition: all of selection_*

Author

frack113, Nasreddine Bencherchali (Nextron Systems)

Created

2023-09-05

Data Sources

windowsProcess Creation Events

Platforms

windows

References

Tags

attack.execution

Raw Content

title: Potentially Suspicious Electron Application CommandLine
id: 378a05d8-963c-46c9-bcce-13c7657eac99
related:
    - id: f26eb764-fd89-464b-85e2-dc4a8e6e77b8
      type: similar
status: test
description: Detects potentially suspicious CommandLine of electron apps (teams, discord, slack, etc.). This could be a sign of abuse to proxy execution through a signed binary.
references:
    - https://positive.security/blog/ms-officecmd-rce
    - https://lolbas-project.github.io/lolbas/Binaries/Teams/
    - https://lolbas-project.github.io/lolbas/Binaries/Msedge/
    - https://lolbas-project.github.io/lolbas/Binaries/msedgewebview2/
    - https://medium.com/@MalFuzzer/one-electron-to-rule-them-all-dc2e9b263daf
    - https://chromium.googlesource.com/chromium/chromium/+/master/content/public/common/content_switches.cc
author: frack113, Nasreddine Bencherchali (Nextron Systems)
date: 2023-09-05
modified: 2023-11-09
tags:
    - attack.execution
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith:
              # Add more electron based app to the list
              - '\chrome.exe'
              - '\code.exe'
              - '\discord.exe'
              - '\GitHubDesktop.exe'
              - '\keybase.exe'
              - '\msedge_proxy.exe'
              - '\msedge.exe'
              - '\msedgewebview2.exe'
              - '\msteams.exe'
              - '\slack.exe'
              - '\Teams.exe'
        - OriginalFileName:
              # Add more electron based app to the list
              - 'chrome.exe'
              - 'code.exe'
              - 'discord.exe'
              - 'GitHubDesktop.exe'
              - 'keybase.exe'
              - 'msedge_proxy.exe'
              - 'msedge.exe'
              - 'msedgewebview2.exe'
              - 'msteams.exe'
              - 'slack.exe'
              - 'Teams.exe'
    selection_cli:
        CommandLine|contains:
            - '--browser-subprocess-path'
            - '--gpu-launcher'
            - '--renderer-cmd-prefix'
            - '--utility-cmd-prefix'
    condition: all of selection_*
falsepositives:
    - Legitimate usage for debugging purposes
# Increase the level once FP rate is known better (see status)
level: medium