Malicious code in @antv/g-plugin-matterjs (npm)
The npm account `atool` was compromised and used to publish 631 malicious versions across 314 packages, including @antv/g-plugin-matterjs, in a 22-minute automated burst. Each malicious version injects a preinstall hook executing an obfuscated Bun script that exfiltrates credentials via the GitHub API and establishes persistence through CI/CD workflow injection and system daemons.
- Disclosed
- Last updated
- Blast radius
- 631 malicious versions across 314 npm packages; widespread credential exfiltration affecting AWS, GitHub, npm, GCP, Azure, Kubernetes, SSH, Docker, databases, Stripe, and Slack
- Attack vectors
- Threat actor
- Affected entities
- @antv/g-plugin-matterjsMalicious 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/g-plugin-matterjs 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 code establishes 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 compromise was confirmed by both Amazon Inspector and Google Open Source Security sources.
Indicators of compromise
- Packages
- @antv/g-plugin-matterjs
Remediation
- Immediately audit and revoke all credentials (AWS keys, GitHub PATs, npm tokens, GCP service accounts, Azure credentials, Kubernetes tokens, SSH keys, Docker configs, database credentials, Stripe keys, Slack tokens) that may have been exposed
- Remove all malicious versions of @antv/g-plugin-matterjs and other affected packages from npm; use npm audit to identify installed malicious versions
- Inspect CI/CD workflows for unauthorized `Run Copilot` workflows or other suspicious workflow modifications; remove any injected workflows
- Search systems for the `kitty-monitor` daemon and remove it; audit system processes and startup configurations for persistence mechanisms
- Review GitHub repository commits for suspicious activity and attacker-controlled repositories with Dune-themed names
- Implement strict npm package pinning and use lock files to prevent automatic installation of malicious updates
- Monitor for signs of data exfiltration and unauthorized access using stolen credentials
Sources
- GitHub Advisory GHSA-q4h5-6vh5-927v · GitHub Advisory Database
Cite this entry
"Malicious code in @antv/g-plugin-matterjs (npm)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 26, 2026; last updated July 26, 2026. https://supplychainattack.org/incident/malicious-code-in-antv-g-plugin-matterjs-npm-1brc7a
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