bigops-file-storage@35.1.2

Analysis

bigops-file-storage@35.1.2 is a trojanized package that downloads and executes a platform-specific binary on install. The package's index.js silently requires _vendor.js, which resolves the target platform (linux_x64, linux_arm64, darwin, win32) and fetches a binary from Cloudflare Workers C2 endpoints (oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf103-070[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev) with paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, or /pkg/package.exe. If HTTPS fails, it falls back to DNS TXT-based payload retrieval via domains sdk[.]dl[.]wel1[.]ru, ext[.]dl[.]wel1[.]ru, pkg[.]dl[.]wel1[.]ru, net[.]dl[.]wel1[.]ru. The downloaded binary is written to /var/tmp/.cache_<hex> (or %TEMP%\dotnet_diag_<hex>.exe on Windows) and executed as a detached process. A decoy 81KB analytics SDK (lib/telemetry.js) is bundled to appear legitimate but is never invoked.