tinkoff-statist-browser-typed-client-investing.product.pulse@20.4.5

Analysis

On require(), the package silently executes a multi-stage downloader (_bootstrap.js) that fingerprints the host platform and architecture, then contacts Cloudflare Workers C2 endpoints to download a platform-specific binary payload. The C2 hosts are: oob-worker[.]cf102-baf[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf103-070[.]workers[.]dev — each serving the binary at /pkg/package (or /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe depending on platform). If the HTTPS download fails, it falls back to a DNS TXT-based C2 channel via c[.]tin[.]dl[.]well1[.]site, where TXT records contain base64-encoded payload chunks reassembled client-side. The downloaded binary is written to /var/tmp/.cache_<hex> (Linux/macOS) or C:\Windows\Temp\dotnet_diag_<hex>.exe (Windows), made executable, and launched as a detached background process (cmd.exe /c start /b on Windows, /bin/sh -c "path &" on Linux) that outlives the parent process.