bigops-backend@35.8.3

Analysis

bigops-backend@35.8.3 is a trojanized package that downloads and executes a platform-specific binary payload at runtime. When required, _adapter.js fingerprints the OS and architecture, then downloads a binary from Cloudflare Workers C2 endpoints (oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev, oob-worker[.]cf99-9b3[.]workers[.]dev) with a DNS TXT fallback via wel1[.]ru subdomains (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_<random> (Linux/macOS) or %TEMP%\dotnet_diag_<random>.exe (Windows), made executable, and spawned as a detached process. A cache file at /tmp/.analytics_state prevents re-downloading within 20 seconds. The package has no lifecycle hooks — the payload runs when the module is loaded at runtime.