The '@finxsecdemo/utils' npm package versions 1.0.2 and 1.0.3 include a postinstall.js lifecycle script that unconditionally contacts a hardcoded OAST domain on every installation. It collects and transmits system information including os.hostname(), os.userInfo(), and process.env to the attacker's server, leaking the installer's IP and DNS resolver IP. The package's main export returns a string that corrupts formatted currency output, impacting any dependent software that uses it. The network callback and output corruption happen regardless of the package's console message claiming it is a 'dependency confusion PoC.' The OpenSSF Package Analysis project has identified this package as malicious due to its communication with a domain associated with malicious activity.

This malicious package leaks sensitive system information and network details to an attacker-controlled domain during installation, potentially exposing the installer's environment and network topology. It also corrupts output in dependent applications that display formatted currency, which may cause functional or data integrity issues. There is no indication of active exploitation in the wild at this time.

No official patch or remediation is currently documented. Users should avoid installing versions 1.0.2 and 1.0.3 of '@finxsecdemo/utils'. If these versions are present, remove the package and replace it with a trusted alternative. Monitor for updates from the package maintainer or npm registry for any official fixes or advisories. Since this is not a cloud service, remediation depends on user action.