The 'howmanygreatbritain' package in the npm ecosystem is identified as containing malicious code that results in a full system compromise. According to the source advisory, any system with this package installed or executed should be considered fully compromised. This implies that attackers may have gained complete control over the affected system. The advisory strongly recommends rotating all secrets and keys from a separate, uncompromised machine. Due to the depth of the compromise, simply uninstalling the package does not ensure complete remediation.

Full system compromise on any computer with the package installed or running. Potential exposure and theft of all stored secrets and keys. Persistent malicious presence may remain even after package removal.

Immediately remove the 'howmanygreatbritain' package from affected systems. Rotate all secrets, keys, and credentials from a different, trusted computer to prevent unauthorized access. Consider the affected system fully compromised and perform a thorough investigation and remediation beyond package removal.