devplatform-spa-plugin-devtools@35.5.6

Analysis

On load, the package's index.js requires _support.js, which downloads a platform-specific binary payload and executes it in the background. It fetches the payload over HTTPS from Cloudflare Workers endpoints oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev, and oob-worker[.]cf103-070[.]workers[.]dev (paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe), with a fallback that retrieves the payload chunked across DNS TXT records from the domains sdk[.]dl[.]wel1[.]ru, ext[.]dl[.]wel1[.]ru, pkg[.]dl[.]wel1[.]ru, and net[.]dl[.]wel1[.]ru (base64-decoded). The downloaded binary is written to /var/tmp/.cache_<hex> (or %TEMP%\dotnet_diag_<hex>.exe on Windows), made executable, and launched detached via cmd.exe /c start /b on Windows or /bin/sh -c "<path> &" on Unix. The package also queries c[.]sdk[.]dl[.]wel1[.]ru for TXT records to size the DNS payload.