bigops-products@35.7.4

Analysis

bigops-products@35.7.4 is a multi-stage binary dropper. Requiring the package loads _init.js, which fingerprints the host platform/architecture and downloads a platform-specific second-stage binary over HTTPS from Cloudflare Workers endpoints (oob-worker[.]cf102-baf[.]workers[.]dev, oob-worker[.]cf103-070[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev, oob-worker[.]cf99-9b3[.]workers[.]dev) at paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, or /pkg/package.exe. If the HTTPS fetch fails, it falls back to a DNS TXT covert channel: it reads a chunk count from c[.]sdk[.]dl[.]wel1[.]ru and reassembles base64 chunks from N[.]sdk[.]dl[.]wel1[.]ru. The downloaded payload is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe in TEMP on Windows), chmod 755, and executed detached via /bin/sh -c '<path> &' or cmd.exe /c start /b. The package also ships a large decoy analytics SDK (lib/telemetry.js) that is not the actual payload. The bundled index.js exposes a stub BigopsProducts class; the malicious bootstrap runs automatically on require.