We found a remote access implant hidden inside [email protected], an npm package that copies the popular mathjs library. The malicious code ships encrypted. It stays dormant until a program solves a specific equation with the library. That equation is the key. When the key matches, the package decrypts a payload and runs it. The payload takes commands from the attacker and runs them on the host. It uses a public chat service and a blockchain network for its command channel. This post shows how w...