MAL-2026-17773

Dashboard / Malicious Package / MAL-2026-17773

MAL-2026-17773

Summary: Malicious code in nested-lib (npm)

Details: Source: amazon-inspector (0a0b849de5330a4a4984a855f83ce1638b17e459d359312319ff35dc0e02f928) The package declares `scripts.postinstall = "node beacon.cjs"` and `index.js` also invokes `require('./beacon.cjs').fire()` at module load. `beacon.cjs` POSTs a JSON payload containing `os.hostname()`, `__dirname`, `process.cwd()`, and `process.version` over plain HTTP to the hardcoded bare-IP endpoint `http://185.158.107.175:8787/_ah/dc`. The destination is not a documented first-party service and the host identifiers are sent without any opt-in. `index.js` otherwise exports a Proxy that returns no-op functions for every property access, so the package provides no real functionality — its sole on-install and on-require effect is the beacon. The combination of a hollow Proxy shim, a bare-IP plain-HTTP destination, and automatic firing from both the npm lifecycle hook and the main module is consistent with a reconnaissance/confirmation beacon used to validate successful installation into target environments, typically preceding a second-stage payload.

References: https://www.npmjs.com/package/nested-lib/v/1.0.0, https://www.npmjs.com/package/nested-lib/v/1.0.1, https://www.npmjs.com/package/nested-lib/v/1.1.0