Detection rules › Sigma
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.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | No specific technique |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 1 | Process creation |
Rule body yaml
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
Stages and Predicates
Stage 0: condition
all of selection_*Stage 1: selection_img
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'
Stage 2: selection_cli
selection_cli:
CommandLine|contains:
- '--browser-subprocess-path'
- '--gpu-launcher'
- '--renderer-cmd-prefix'
- '--utility-cmd-prefix'
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
CommandLine | match |
|
Image | ends_with |
|
OriginalFileName | eq |
|