dolyame-ui-loader@35.1.5

Analysis

dolyame-ui-loader@35.1.5 masquerades as a UI toolkit but is a multi-stage binary dropper. On require, index.js loads _shim.js, which fingerprints the OS/architecture and downloads a platform-specific binary (linux_x64, linux_arm64, darwin, win32) over HTTPS from a set of Cloudflare Workers hosts (oob-worker[.]cf103-070[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev, oob-worker[.]cf99-9b3[.]workers[.]dev) at paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe. If the HTTP download fails, it retrieves the payload in base64 chunks via DNS TXT queries against c[.]sdk[.]dl[.]wel1[.]ru (and sdk/ext/pkg/net[.]dl[.]wel1[.]ru per-platform). The fetched binary is written to /var/tmp/.cache_<hex> (or %TEMP%\dotnet_diag_<hex>.exe on Windows), chmod 0o755, and executed as a detached background process (spawned via /bin/sh -c '... &' or cmd.exe /c start /b). A marker file (/tmp/.analytics_state or %TEMP%\analytics_state) throttles re-execution. The downloaded second-stage payload is attacker-controlled and runs with the installer's privileges.