Potentially Suspicious Inline JavaScript Execution via NodeJS Binary — Sigma Rule

Rule metadata and linked tags

Author: Microsoft (idea), Swachchhanda Shrawan Poudel (Nextron Systems). Source status: experimental; severity: medium. Source dates: 2025-04-21 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 0664002eb69366eb2516ec2ffb174f84deabb8f5c35431912cba229ed79756e8

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: Potentially Suspicious Inline JavaScript Execution via NodeJS Binary
id: 8537c866-072e-460d-bfff-aaf39cbd73d3
status: experimental
description: Detects potentially suspicious inline JavaScript execution using Node.js with specific keywords in the command line.
references:
    - https://www.microsoft.com/en-us/security/blog/2025/04/15/threat-actors-misuse-node-js-to-deliver-malware-and-other-malicious-payloads/
author: Microsoft (idea), Swachchhanda Shrawan Poudel (Nextron Systems)
date: 2025-04-21
tags:
    - attack.execution
    - attack.t1059.007
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\node.exe'
        - OriginalFileName: 'node.exe'
        - Product: 'Node.js'
    selection_cmd:
        CommandLine|contains|all:
            - 'http'
            - 'execSync'
            - 'spawn'
            - 'fs'
            - 'path'
            - 'zlib'
    condition: all of selection_*
falsepositives:
    - Legitimate scripts using Node.js with these modules
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate scripts using Node.js with these modules

Source references

• https://www.microsoft.com/en-us/security/blog/2025/04/15/threat-actors-misuse-node-js-to-deliver-malware-and-other-malicious-payloads/