Malicious Mini Shai-Hulud npm Dropper node setup.mjs from IDE Hook Dirs (via process_creation)

ATT&CK techniques

Initial Access → Execution

Recon
Resource Dev
Initial Access
- T1195.002Compromise Software Supply Chain
Execution
- T1059.007JavaScript
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects node executing setup.mjs from a .claude or .vscode directory which the Mini Shai-Hulud SAP npm compromise wires into Claude Code SessionStart and VS Code folderOpen hooks to run its Bun downloader on every session. Execution of this dropper from an IDE hook directory indicates the trojanized package payload is fetching and running execution.js.

Reporting behind it

Related detections9 linkedT1059.007 — drag to rearrange

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Malicious Shai-Hulud Bun Payload Execution via npm Preinstall Script (via process_creation)

Malicious Shai-Hulud npm Payload Execution via bun_environment Script (via process_creation)

Linux File Creation Indicators for TanStack Runner and Persistence Components

Windows TanStack Supply-Chain File Creation Indicators via router_init.js and router_runtime.js

Malicious Mini Shai-Hulud npm Dropper node setup.mjs from IDE Hook Dirs (via process_creation)

Pivot detection · T1059.007 · 9 related

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