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containedcritical

Malicious code in @antv/mcp-server-antv (npm)

The npm account `atool` was compromised and used to publish 631 malicious versions across 314 npm packages, including @antv/mcp-server-antv, in a 22-minute automated burst. Each malicious 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; affects any system that installed affected versions during the attack window
Ecosystems
npmOther
Attack vectors
Account takeoverCompromised packageMalicious commit
Threat actor
Mini Shai Hulud
Affected entities
  • @antv/mcp-server-antvnpm package compromised as part of Mini Shai-Hulud campaign

A threat actor compromised the npm account atool and published 631 malicious versions across 314 npm packages in an automated 22-minute burst as part of the "Mini Shai-Hulud" supply chain attack campaign. The @antv/mcp-server-antv package was among the affected packages.

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 data is committed to attacker-controlled repositories following Dune-themed naming patterns (e.g., harkonnen-melange-742).

Beyond credential theft, the malicious code establishes persistence through multiple mechanisms: CI/CD workflow injection via a GitHub Actions workflow named Run Copilot that dumps all secrets via toJSON(secrets), AI agent session hooks, and a system daemon named kitty-monitor.

The compromise was identified by multiple security sources including Amazon Inspector and Google Open Source Security.

Indicators of compromise

Packages
  • @antv/mcp-server-antv

Remediation

  • Immediately audit and 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 or downgrade @antv/mcp-server-antv to a known-clean version prior to the attack
  • Scan systems and CI/CD pipelines for the presence of the `kitty-monitor` daemon and `Run Copilot` GitHub Actions workflow
  • Review git commit history for suspicious commits to attacker-controlled repositories with Dune-themed names
  • Monitor for unauthorized access to systems that installed affected versions during the attack window
  • Implement package signature verification and use npm audit to detect compromised dependencies

Sources

  1. GitHub Advisory GHSA-p6wc-j7x7-ff3v · GitHub Advisory Database

Cite this entry

"Malicious code in @antv/mcp-server-antv (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-mcp-server-antv-npm-1fxhm6

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