MAL-2026-13067 Malicious code in boxy-micro-story (npm)

On require() of the package, index.js loads platform.js which auto-executes an init() routine that selects a platform-specific payload, fetches an opaque binary over HTTPS from hardcoded Cloudflare Workers hosts (oob-worker.cf99-9b3.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf101-adf.workers.dev) with a DNS-TXT fallback under dl.wel1.ru, writes it to /var/tmp or %TEMP% under a hidden/obfuscated filename (.cache<hex> on Unix, dotnet_diag_<hex>.exe on Windows), chmods it 0755, and spawns it detached via /bin/sh -c or cmd.exe. Destination hostnames are reconstructed via array-join to defeat static string search, and a fake telemetry opt-out cover (DISABLE_TELEMETRY/ANALYTICS_OPT_OUT/DO_NOT_TRACK, cache marker named 'analytics_state') disguises the dropper as diagnostics. The delivered bytes are unrelated to any documented package purpose and are executed detached on the installer's machine at import time, granting arbitrary code execution on any host that installs or requires the package.