Potentially Suspicious Inline JavaScript Execution via NodeJS Binary

Severity: medium
Author: Microsoft (idea), Swachchhanda Shrawan Poudel (Nextron Systems)
Source: upstream

Detects potentially suspicious inline JavaScript execution using Node.js with specific keywords in the command line.

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1059.007` Command and Scripting Interpreter: JavaScript

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation

Stages and Predicates

Stage 1: `all of selection_img`

or:
Image|endswith: '\node.exe'
OriginalFileName: node.exe
Product: Node.js

Stage 2: `all of selection_cmd`

CommandLine|contains: execSync
CommandLine|contains: fs
CommandLine|contains: http
CommandLine|contains: path
CommandLine|contains: spawn
CommandLine|contains: zlib

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	`execSync` `fs` `http` corpus 31 (sigma 31) `path` corpus 2 (sigma 2) `spawn` `zlib`
`Image`	ends_with	`\node.exe` corpus 3 (sigma 3)
`OriginalFileName`	eq	`node.exe` corpus 2 (sigma 2)
`Product`	eq	`Node.js` corpus 2 (sigma 2)