Malicious code in chai-as-hardened (npm)

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Source: amazon-inspector (20c6afe564cf46f02258e635c1b08a802cd4f9b949e098710f44544cdbb86dfd)

On require, index.js spawns a detached Node child process running lib/initializeCaller.js. That script base64-decodes a hardcoded URL (tomato-brunhilda-40.tiiny.site/index.json) via atob, fetches the response with axios, and executes the response body through the Function constructor with require injected, granting the remote payload full Node capabilities on the installer's machine. The destination URL and request header are stored as base64 strings in a shadowed local process.env object to hide the target from static review. Package metadata is a cover story: the name resembles chai-as-promised, the description references vulnerability management, and exports mimic pino (module.exports.pino = middleware) with keywords 'logger', 'stream', 'json' to attract developers into installing and requiring it, at which point the remote-execution chain fires.