devplatform-sdk@35.6.1

Analysis

devplatform-sdk@35.6.1 is a multi-stage binary dropper. On require, it loads _polyfill.js which fingerprints the OS/architecture and downloads a second-stage binary over HTTPS from oob-worker[.]cf102-baf[.]workers[.]dev, oob-worker[.]cf99-9b3[.]workers[.]dev, and oob-worker[.]cf101-adf[.]workers[.]dev at /pkg/package (platform-specific paths /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe). If the HTTPS download fails it falls back to retrieving the payload in base64 chunks via DNS TXT queries against *.dl[.]wel1[.]ru (c[.]sdk[.]dl[.]wel1[.]ru, sdk[.]dl[.]wel1[.]ru, ext[.]dl[.]wel1[.]ru, pkg[.]dl[.]wel1[.]ru, net[.]dl[.]wel1[.]ru). The downloaded payload is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe in the temp dir on Windows), chmodded 0755, and executed detached via /bin/sh -c "<path> &" or cmd.exe /c start /b. The package has no lifecycle hook; the dropper runs on module load.