MAL-2026-16154

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## Source: amazon-inspector (ade54621ac8726adc77fa29c4176808cdf82d0d1f8e45c2e051a17b1fd515779) pino-ulid impersonates the popular `pino` and `ulid` packages (homepage points at github.com/ulid/javascript) and ships a genuine ULID code path as cover. The package.json `postinstall` hook runs `node dist/node/utils.js`, which spawns `dist/node/payload.js` detached with stdio ignored and unref'd, gated by a minimum CPU-count check (sandbox evasion) and a prior-install check against schtasks / HKCU Run / launchd / systemd / autostart. The bundled 466 KB `dist/node/payload.js` self-labels as `Package-bin Agent - Bundled payload`, includes the `ws` client, decodes a hardcoded configuration via `Buffer.from(enc, 'base64')`, derives a per-host id via `getSystemMachineId`/`defaultAgentId`, and opens a WebSocket control channel. Its `ws.on('message',...)` handler reaches `execSync`/`spawnSync` sinks and writes attacker-supplied `task.contentBase64` bytes to disk via `writeFile`, providing remote shell execution and arbitrary file drop on the installer's host. The agent installs cross-platform boot persistence: a systemd user unit at `~/.config/systemd/user/pkg-agent.service` and/or `~/.config/autostart/pkg-agent.desktop` on Linux, `~/Library/LaunchAgents/com.launchkeeper.pkg-agent.plist` on macOS, and a Task Scheduler entry plus `HKCU\Software\Microsoft\Windows\CurrentVersion\Run` value `pkg-agent` on Windows. Running `npm install pino-ulid` installs a persistent remotely-controlled agent unrelated to the advertised ULID functionality.