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containedcritical

Malicious code in @antv/matrix-util (npm)

The npm account `atool` was compromised and used to publish 631 malicious versions across 314 npm packages, including @antv/matrix-util, in a 22-minute automated burst. Each version injects a preinstall hook executing an obfuscated Bun script that exfiltrates credentials and establishes persistence via CI/CD workflow injection and system daemons.

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Disclosed
Last updated
Blast radius
631 malicious versions across 314 npm packages; widespread credential theft affecting AWS, GitHub, npm, GCP, Azure, Kubernetes, SSH, Docker, databases, Stripe, and Slack
Ecosystems
npmOther
Attack vectors
Account takeoverCompromised packageMalicious commit
Affected entities
  • @antv/matrix-utilMalicious preinstall hook injected; part of Mini Shai-Hulud campaign

A threat actor compromised the npm account atool and launched the "Mini Shai-Hulud" supply chain attack campaign, publishing 631 malicious versions across 314 npm packages in an automated 22-minute burst. The @antv/matrix-util package was among those compromised.

Each malicious version injects a preinstall hook that executes a 498KB obfuscated Bun script. The script uses the GitHub API as a covert exfiltration channel to steal credentials including 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. Stolen credentials are committed to attacker-controlled repositories following Dune-themed naming patterns (e.g., harkonnen-melange-742).

Beyond credential theft, the malicious packages establish persistence through multiple mechanisms: 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. The attack was detected by Amazon Inspector and Google Open Source Security, with attribution to the TeamPCP threat actor.

Indicators of compromise

Packages
  • @antv/matrix-util

Remediation

  • Immediately revoke all credentials (AWS keys, GitHub PATs, npm tokens, GCP service accounts, Azure credentials, Kubernetes tokens, SSH keys, Docker auth configs, database credentials, Stripe keys, Slack tokens) that may have been exposed
  • Remove all malicious versions of affected packages from npm; audit package.json and lock files for any dependency on compromised versions
  • Audit CI/CD workflows and GitHub Actions for unauthorized `Run Copilot` workflows or other suspicious workflow modifications
  • Scan systems for the `kitty-monitor` daemon and remove if present
  • Review git commit history and attacker-controlled repositories (Dune-themed naming patterns) for exfiltrated data
  • Implement package signature verification and use npm audit to detect compromised dependencies
  • Enable 2FA on npm and GitHub accounts; rotate all authentication credentials

Sources

  1. GitHub Advisory GHSA-hgqm-cwrq-xx84 · GitHub Advisory Database

Cite this entry

"Malicious code in @antv/matrix-util (npm)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 27, 2026; last updated July 28, 2026. https://supplychainattack.org/incident/malicious-code-in-antv-matrix-util-npm-1p1d9n

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