Malicious code in @antv/g-plugin-css-select (npm)
The npm account `atool` was compromised and used to publish 631 malicious versions across 314 packages, including @antv/g-plugin-css-select, 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.
- 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-css-selectMalicious 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 on or around July 26, 2026. The @antv/g-plugin-css-select 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 and commits stolen credentials to attacker-controlled repositories following Dune-themed naming patterns (e.g., harkonnen-melange-742).
Exfiltrated data includes 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. The attack 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 incident was identified by Amazon Inspector and Google Open Source Security, confirming the package was compromised as part of the ongoing "Mini Shai-Hulud" campaign.
Indicators of compromise
- Packages
- @antv/g-plugin-css-select
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-css-select 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 cron jobs for persistence mechanisms
- Review GitHub repository activity for commits to attacker-controlled repositories with Dune-themed names
- Rotate all secrets and credentials used in CI/CD pipelines and development environments
- Monitor for unauthorized access to systems and services using exfiltrated credentials
Sources
- GitHub Advisory GHSA-wh4r-hmcf-hc4p · GitHub Advisory Database
Cite this entry
"Malicious code in @antv/g-plugin-css-select (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-css-select-npm-1u1d7n
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