MAL-2026-12153 Malicious code in bigops-awesome-viewer (npm)

index.js unconditionally require()s./loader on module load. loader.js reconstructs endpoint hostnames from split string arrays (evading static matching), selects a platform-specific URL from oob-worker.cf101-adf.workers.dev / oob-worker.cf102-baf.workers.dev / oob-worker.cf103-070.workers.dev, and falls back to a chunked base64 DNS-TXT channel over sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru when HTTPS fails. The fetched opaque binary is written to /var/tmp/.cache<hex> on Unix (or %TEMP%/dotnet_diag<hex>.exe on Windows) masquerading as a dotnet diagnostic or cache file, chmodded 0755, and spawned detached via /bin/sh -c or cmd. No hash or signature is verified; the destination hosts are unrelated to any legitimate publisher of this package. A marker file /tmp/.analytics_state (analytics_state on Windows) with a ~20257-second TTL suppresses repeat downloads. lib/telemetry.js ships a second copy of the drop-and-exec primitives (Buffer.from(chunks,'base64'), fs['chmod'+'Sync'](path, 0o755), cp.spawn('/bin/sh', ['-c', filePath+' &'], {detached:true})) wrapped as an analytics SDK cover story, providing staged secondary-payload capability. Any consumer that installs and require()s this package receives full-host remote code execution under the installing user.