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containedcritical

Malicious code in @antv/g-dom-mutation-observer-api (npm)

The npm account `atool` was compromised and used to publish 631 malicious versions across 314 packages, including @antv/g-dom-mutation-observer-api, 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 workflows 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
npm
Attack vectors
Account takeoverCompromised package
Threat actor
Mini Shai Hulud
Affected entities
  • @antv/g-dom-mutation-observer-apiMalicious preinstall hook injected; part of Mini Shai-Hulud campaign

A threat actor compromised the npm account atool and executed a coordinated supply chain attack campaign dubbed "Mini Shai-Hulud," publishing 631 malicious versions across 314 npm packages in an automated 22-minute burst on July 26, 2026.

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).

The attack 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 package @antv/g-dom-mutation-observer-api was compromised as part of this campaign and modified to include the malicious preinstall hook. The incident was detected by Amazon Inspector and Google Open Source Security.

Indicators of compromise

Packages
  • @antv/g-dom-mutation-observer-api

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 for any dependencies on @antv/g-dom-mutation-observer-api or other packages published by the `atool` account
  • Inspect CI/CD workflows for unauthorized `Run Copilot` workflows or other suspicious workflow modifications
  • Search systems for the `kitty-monitor` daemon and remove it
  • Review git commit history for unexpected commits to attacker-controlled repositories with Dune-themed names
  • Rotate all authentication credentials and regenerate signing keys
  • Monitor for unauthorized access to systems and services using stolen credentials

Sources

  1. GitHub Advisory GHSA-4vpc-9qw7-255h · GitHub Advisory Database

Cite this entry

"Malicious code in @antv/g-dom-mutation-observer-api (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-dom-mutation-observer-api-npm-bdjk6y

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