MAL-2026-3653 Malicious code in @design-system-coopeuch/web (npm)

Package @design-system-coopeuch/[email protected] is a dependency-confusion squat of an internal-looking scope, published at an inflated 999.x version to override any private registry copy. package.json declares a preinstall hook that runs cb.js, which collects installer host identifiers (os.hostname(), cwd, install directory, id, uname -a, OS release info, and the full list of process.env key names) and POSTs them as JSON over cleartext HTTP to a hardcoded bare IP, http://157.173.126.113:8443/dep-confusion (cb.js line 20: hostname: "157.173.126.113", port: 8443, path: "/dep-confusion", method: "POST"). The beacon fires automatically on npm install without user consent. Although the package description self-labels as an "authorized bug bounty PoC," any unintended installer has their host fingerprint exfiltrated to an attacker-controlled endpoint. The combination of internal-scope impersonation, inflated version, and install-time beacon to a bare IP is the canonical dependency-confusion attack shape.

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.

The OpenSSF Package Analysis project identified '@design-system-coopeuch/web' @ 999.0.0 (npm) as malicious.

It is considered malicious because:

• The package executes one or more commands associated with malicious behavior.