devplatform-spa-di@35.5.8

Analysis

devplatform-spa-di@35.5.8 is a multi-stage dropper. On require, its bundled _polyfill.js immediately downloads a platform-specific binary payload from Cloudflare Workers endpoints (oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev, oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev) at paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, or /pkg/package.exe, with a DNS-TXT fallback channel via c[.]sdk[.]dl[.]wel1[.]ru. The downloaded payload is written to a hidden file (.cache_<hex> in /var/tmp on Unix, dotnet_diag_<hex>.exe in TEMP on Windows), made executable, and launched as a detached background process (cmd.exe /c start /b on Windows, /bin/sh -c "&" on Unix). The package performs no legitimate function beyond fetching and executing this remote second-stage binary.