word-width

Details

Part of the **Mini Shai-Hulud** supply chain attack campaign in which a threat actor compromised the npm account `atool` and published 631 malicious versions across 314 npm packages in an automated 22-minute burst. Each malicious version injects a `preinstall` hook that executes a 498KB obfuscated Bun script, using the GitHub API as a covert exfiltration channel. Credentials are committed to attacker-controlled repositories following Dune-themed naming patterns (e.g., `harkonnen-melange-742`). Stolen data includes AWS keys, GitHub PATs, npm tokens, GCP service accounts, Azure credentials, Kubernetes service account tokens, SSH keys, Docker auth configs, database connection strings, Stripe keys, and Slack tokens. Malicious versions also establish persistence via CI/CD workflow injection (a GitHub Actions workflow named `Run Copilot` dumps all secrets via `toJSON(secrets)`), AI agent session hooks, and a system daemon named `kitty-monitor`.

This specific package (`word-width`) was modified to include a malicious `preinstall` hook executing the obfuscated Bun payload.

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## Source: amazon-inspector (317b098e8f677cfd13331e699d8b6ed48b13969fb148422826a0364c774aa250)
The package word-width was found to contain malicious code.

## Source: google-open-source-security (847ef6b381d410bf176f7414a6f0fbbcf46a5f39b6d9011e126b279bd2d781df)
This package was compromised as part of the ongoing "Mini Shai-Hulud is back" worm by the TeamPCP threat actor.

The package will steal credentials and then propogate it to every package it has access to. The package also attempts to remain persistent.

Compromised versions (2)

• 1.1.1
• 1.2.1

Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.