Malicious Node.js Execution of Hidden .claude Setup Script

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.js executing a setup script from a hidden .claude directory, the auto-run payload delivered by the open source Shai-Hulud framework. A workspace tasks.json configured to run on folder open silently launches this script when a developer opens the repository. Node running a hidden .claude setup module is not part of normal project execution and marks the initial foothold.

Reporting behind it

Related detections9 linkedT1195.002 — drag to rearrange

Suspicious npm Postinstall Node Execution From Fixtures Path (BeaverTail OtterCookie)

Suspicious NPM Install Hook Executing Setup Script via Node

Malicious Bun Runtime Payload Dropped by Shai Hulud npm Supply Chain Attack

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

Suspicious Node Payload Drop in Local Share Directory (via file_event)

Suspicious Node.js Spawning Script Interpreter for Dropped Payload

Malicious Node.js Execution of Hidden .claude Setup Script

Pivot detection · T1195.002 · 9 related

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