MAL-2026-18288 Malicious code in jshelperdependenceny (npm)

npm package 'jshelperdependenceny' is published at version 99.0.0 with a preinstall banner stating it is intended to shadow an internal v1.0.0 package of the same name — the classic dependency-confusion shape of using an inflated version to win resolution against a private registry. On install, package.json runs 'node preinstall.js || true', which collects os.hostname(), os.platform(), os.arch(), and the package name/version and POSTs them as JSON to a URL taken from the DC_CALLBACK_URL environment variable, defaulting to http://127.0.0.1:5656/exfil. The env-var override turns the loopback default into a functional attacker-configurable beacon that fires automatically on npm install and discloses installer host identifiers plus confirmation that the shadowed internal name resolved to this public artifact.

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.