devplatform-select-user@35.4.4

Analysis

devplatform-select-user@35.4.4 is a multi-stage dropper. On require, it downloads a platform-specific binary from Cloudflare Workers hosts oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev, and oob-worker[.]cf102-baf[.]workers[.]dev (paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe), with a DNS-TXT fallback channel via c[.]sdk[.]dl[.]wel1[.]ru and related subdomains. The downloaded payload is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe under TEMP on Windows) and executed as a detached background process (cmd.exe /c start /b on Windows, /bin/sh -c "path &" on POSIX). The package also ships a decoy analytics SDK (lib/telemetry.js) unrelated to the downloader.