If this package is installed
Remove it, treat the machine (or CI runner) as compromised, and rotate every secret, token and key it could access — from a different, clean machine.
Details
Source: amazon-inspector (dc60a9083c9eef36fa2df3fbf6f9123aea7ddcf1f244b28ce480f8440d0c6380)
file-saver-bg@9.9.9 is a dependency-confusion-shaped package (name resembles 'file-saver', implausibly high version 9.9.9 to win internal resolution) whose package.json declares both preinstall and postinstall lifecycle scripts invoking beacon.js. beacon.js collects os.hostname(), os.userInfo().username, process.cwd(), and os.platform() and transmits them as query parameters in an HTTP GET to the hardcoded bare-IP endpoint http://100.24.177.136/cb. The beacon fires automatically on npm install without any user interaction, disclosing internal build-host identifiers to an attacker-controlled destination.
Source: ghsa-malware (fb2c5b4b6b375b1e32fa020b91c41061e43028b84baded3d7ac0aa49fe67d2f7)
Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.