MAL-2026-4572 Malicious code in get-package-lint (npm)

Package name typosquats the popular get-package-type and reuses its README/exports verbatim, but adds "postinstall": "node utils.cjs" in package.json. utils.cjs is a 263 KB obfuscator.io-protected blob (string-array rotation with anti-debug debugger loops, RegExp toString fingerprint, and Function('return this') sandbox checks) that on npm install: (1) decodes a hardcoded base64+XOR-obfuscated URL and bearer token (HF_TOKEN), (2) HTTPS-GETs a platform-specific binary (linux-x64 / darwin-arm64 / win32-x64 selected via DOWNLOAD_MAP), (3) writes it under the user's local data directory, chmod 0755 on POSIX, and spawns it detached, (4) installs OS-level persistence: on Windows via reg add HKCU\...\CurrentVersion\Run, on macOS via a LaunchAgent plist under ~/Library/LaunchAgents, on Linux via a systemd user unit at ~/.config/systemd/user/<unit>.service followed by systemctl --user daemon-reload && enable && start. The script also self-detaches by re-spawning itself with a child argv via {detached:true, stdio:'ignore'} and calling process.exit(0) so npm sees success while the dropper continues asynchronously. The fetched bytes are opaque, unverified (no hash/signature), and the source domain is not the package's publisher. This is an unambiguous binary-runner-dropper plus backdoor persistence triggered on every install.