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Suspicious PowerShell from npm Package Install

Detects PowerShell launched with an encoded command or a download cradle whose process ancestry includes a Node.js npm package execution (`npx-cli.js` with a scoped or versioned package). Malicious npm packages and…

Description

Detects PowerShell launched with an encoded command or a download cradle whose process ancestry includes a Node.js npm package execution (`npx-cli.js` with a scoped or versioned package). Malicious npm packages and supply-chain compromises commonly run this from install or postinstall scripts to fetch and execute a second stage.

Detection logic

Its licence does not clear it for publishing here

Sunturai publishes a detection's own text where the licence it arrived under has been reviewed and permits it, and Elastic License 2.0 has not. The query as its source wrote it, its canonical form and the hash that pins this revision are in the workspace record.

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Detection requirements

Platform
ContainersESXiIaaSIdentity ProviderLinuxmacOSNetwork DevicesOffice SuiteSaaSWindows

The rule states no platform. This is derived from the 4 ATT&CK techniques it maps to.

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