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containedcritical

Malicious code in @antv/gatsby-theme (npm)

The npm account `atool` was compromised and used to publish 631 malicious versions across 314 packages, including @antv/gatsby-theme. 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 exfiltration affecting AWS, GitHub, npm, GCP, Azure, Kubernetes, SSH, Docker, databases, Stripe, and Slack
Ecosystems
npmOther
Attack vectors
Account takeoverCompromised packageMalicious commit
Threat actor
Mini Shai Hulud
Affected entities
  • @antv/gatsby-themeMalicious 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/gatsby-theme 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.

Beyond credential theft, the malicious code establishes persistence through CI/CD workflow injection (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 attack was confirmed by both Amazon Inspector and Google Open Source Security sources.

Indicators of compromise

Packages
  • @antv/gatsby-theme

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 @antv/gatsby-theme and other affected packages from npm; audit package.json lock files for compromised versions
  • Inspect CI/CD workflows and GitHub Actions for unauthorized `Run Copilot` workflows or other suspicious automation
  • Check systems for the `kitty-monitor` daemon and remove if present
  • Review git commit history for suspicious commits to attacker-controlled repositories with Dune-themed names
  • Upgrade to patched versions of affected packages once available
  • Implement package signature verification and supply chain security scanning in dependency management

Sources

  1. GitHub Advisory GHSA-hv72-467c-8pwg · GitHub Advisory Database

Cite this entry

"Malicious code in @antv/gatsby-theme (npm)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 27, 2026; last updated July 27, 2026. https://supplychainattack.org/incident/malicious-code-in-antv-gatsby-theme-npm-464l1m

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