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Microsoft is investigating a new, emerging Mini Shai-Hulud npm supply chain attack targeting antv packages.
Attackers compromised an antv maintainer account and published malicious versions of multiple widely used packages (for example, antv/g2). As these packages are widely used as dependencies, the compromise propagated into downstream libraries like echarts-for-react, impacting a much broader set of applications and continuous integration (CI) environments.
All compromised packages contain a byte-identical, obfuscated credential-stealing payload delivered via a preinstall hook (Bun). The malware targets high-value secrets including:
- GitHub personal access tokens (PATs) and OpenID Connect (OIDC) tokens
- npm / Amazon Web Service (AWS) credentials and Security Token Service (STS) sessions
- Secure Shell (SSH) keys, kubeconfigs, and .env / .npmrc files
- Software-as-a-service (SaaS) tokens (Slack, Stripe, Vault)
Exfiltration occurs over HTTPS with Transport Layer Security (TLS) validation disabled. The payload also abuses stolen OIDC tokens to forge Supply-chain Levels for Software Artifacts (SLSA) provenance and propagate malicious releases, exhibiting worm-like behavior across repositories.
Malicious files distributed through npm packages are detected by Microsoft Defender as Trojan:AIGen/NPMStealer , "Suspicious Node.js process behavior", or “Credential access attempt”, preventing credential theft and malicious post-install execution.
Mitigation:
- Audit dependencies for affected antv and related packages; pin or downgrade to known-good versions (pre-2025-05-18).
- Revoke and rotate exposed credentials (GitHub, npm, cloud tokens, SSH keys).
- Validate integrity of CI pipelines and recent build artifacts.
- Network IOC: Stolen credentials are exfiltrated over HTTPS to t.m-kosche[.]com:443. Block at egress and review network logs for outbound connections.
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