NodeJS Execution of JavaScript File

SIGMA detection rule by Swachchhanda Shrawan Poudel (Nextron Systems) · NOASSERTION

Detects execution of JavaScript or JSC files using NodeJs binary node.exe, that could be potentially suspicious. Node.js is a popular open-source JavaScript runtime that runs code outside browsers and is widely used for both frontend and backend development. Adversaries have been observed abusing Node.js to disguise malware as legitimate processes, evade security defenses, and maintain persistence within target systems. Because Node.js is commonly used, this rule may generate false positives in some environments. However, if such activity is unusual in your environment, it is highly suspicious and warrants immediate investigation.

title: NodeJS Execution of JavaScript File
id: ba3874b9-0fae-465f-836c-eb5d071a1789
status: experimental
description: |
    Detects execution of JavaScript or JSC files using NodeJs binary node.exe, that could be potentially suspicious.
    Node.js is a popular open-source JavaScript runtime that runs code outside browsers and is widely used for both frontend and backend development.
    Adversaries have been observed abusing Node.js to disguise malware as legitimate processes, evade security defenses, and maintain persistence within target systems.
    Because Node.js is commonly used, this rule may generate false positives in some environments. However, if such activity is unusual in your environment, it is highly suspicious and warrants immediate investigation.
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: 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: '.js'
    condition: all of selection_*
falsepositives:
    - Legitimate use of node.exe to execute JavaScript or JSC files on your environment
level: low

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

86ca7a11-e34a-4fb5-8683-83a89c971278

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

Rejected pattern present

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Not a security issue — this rule is valid and was accepted as-is. These are optional fields/conventions its own format recommends, mainly affecting its quality score and how well it documents itself for other reviewers.

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[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

[[ currentRule.title ]]

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