The 'getd-ui-library' npm package (version 0.0.1) includes a postinstall.js script that runs unconditionally upon installation. This script sends an HTTPS GET request to a hardcoded webhook.site URL, transmitting identifying telemetry such as the installer's hostname, username, platform, current working directory, and CI environment variables. The package name mimics the legitimate '@getd/ui-library' scoped package to capture installs from mistyped package names. The data exfiltration occurs silently with errors suppressed. According to the source, any system with this package installed should be considered fully compromised, necessitating secret and key rotation from a separate machine.

Installation of this package results in exfiltration of sensitive system and environment information to an external attacker-controlled endpoint. This leakage can facilitate targeted attacks against developer machines or CI build agents. The package's presence indicates a full system compromise, potentially allowing attackers to access secrets and keys stored on the affected computer. Removing the package alone may not eliminate the threat due to possible additional malicious software installed.

No official patch or fix is available. The package should be immediately removed from all systems. All secrets and keys stored on affected machines must be rotated from a different, trusted machine. Developers should verify package names carefully to avoid installing similarly named malicious packages. Monitor for any signs of further compromise and consider full system remediation if this package was installed.