@briskforge/envchecknpm

The package advertises itself as a tiny environment-variable validator but ships lib/preflight.js, a heavily obfuscated (obfuscator.io string-array rotation, RC4 decoder, ~1228-entry string array, control-flow flattening) ~277KB bundle that runs on every call to the package's main entry point: lib/index.js invokes preflight.runPrepare() at the top of envcheck(). After deobfuscation, lib/preflight.js performs an HTTPS GET to a remote endpoint, AES-256-GCM-decrypts the response using hardcoded key/IV constants embedded in the bundle, writes the decrypted bytes to a cache directory, and spawns them detached via process.execPath / sh with stdio:'ignore' and windowsHide:true. The module also exports onInstall() and self-executes when run as a script (if (require.main === module) { onInstall(); }), with a BRISKFORGE_E13F_TAG environment marker used as an anti-double-exec guard. The remote source is mutable and the decrypted payload is opaque, so any installer that imports the package — or runs the file directly — executes whatever bytes the operator chooses to serve, with no integrity checks. Package metadata compounds the deception: repository.url, bugs.url, and homepage all point at https://github.com/validatorjs/validator.js, an unrelated well-known OSS project, while the publisher is an unrelated ProtonMail account ([email protected]) with no corresponding GitHub presence — a deliberate impersonation to borrow legitimacy from validatorjs on the npm listing page.