date-fmt-utils-helper @1.0.0

Summary

The package presents itself as a date-formatting utility, but its index.js is a trivial cover and a source comment explicitly labels the library as a disguise. The package.json postinstall hook runs node postinstall.js on npm install, which opens a TCP connection to the hardcoded remote host 8.135.48.40:4444 and pipes /bin/sh stdio over the socket, with bash -i >& /dev/tcp/... and python3 pty.spawn fallbacks, giving the remote party interactive shell access on the installer's machine at install time. On failure the script beacons error details via HTTP GET to http://8.135.48.40/shell/failed and /shell/error, confirming the destination is attacker-controlled command-and-control infrastructure.

Source: amazon-inspector (4ae88f68f30ebd69a595537393ce95c4ce5e543b558572769fa2c608fa1b1b0d)