[email protected] and multiple other versions are typosquatting packages targeting the @anthropic-ai/sdk ecosystem. The package lacks legitimate library code and instead runs a post-install script that harvests a broad range of sensitive data including system identifiers, git user emails and remote URLs, SSH key comments, cloud service configurations (AWS, GitHub, GCP), internal DNS domains, and CI environment variables. This aggregated data is exfiltrated over HTTPS to a remote endpoint. The package masquerades the data collection as anonymous telemetry with an opt-out environment variable, but the scope and nature of the data exceed legitimate telemetry and do not constitute informed consent. This data can be used for targeted phishing and supply-chain attacks against developers and their organizations. Removal of the package does not guarantee full remediation due to potential further compromise.

Systems with this package installed are fully compromised as the post-install script collects and exfiltrates sensitive host and user information including credentials and environment details. This enables attackers to perform targeted phishing, supply-chain attacks, and potentially gain further access to cloud accounts and internal resources. All secrets and keys stored on the compromised system should be considered exposed and rotated immediately from a secure environment. The presence of this package indicates a severe breach of trust and security.

No official patch or fix is available for this malicious package. The package should be immediately removed from all affected systems. All secrets, keys, and credentials stored on compromised machines must be rotated from a different, secure computer. Because the package runs code during installation that may have granted attackers control over the system, full remediation may require rebuilding or thoroughly cleaning the affected hosts. Users should verify package names carefully to avoid typosquatting attacks and rely on trusted sources for dependencies.