npm · Malicious package advisory
Malwarenested-lib
MAL-2026-17773
Malicious code in nested-lib (npm)
Details
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_-= Per source details. Do not edit below this line.=-_
## 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.
Compromised versions (3)
- 1.0.0
- 1.0.1
- 1.1.0
Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.