tinkoff-boxy-desktop-features-banner@20.2.4

Analysis

Combosquat package impersonating a Tinkoff internal module. On require(), setup.js fingerprints the OS/architecture and downloads a platform-specific binary payload from Cloudflare Workers C2 infrastructure (oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf103-070[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev) via HTTPS GETs to /pkg/package, /pkg/package-arm64, /pkg/loader_mac, or /pkg/package.exe. A DNS TXT-based fallback channel via c[.]tin[.]dl[.]well1[.]site retrieves the payload if the HTTPS downloads fail. The downloaded binary is written to /var/tmp/.cache_* (Linux/macOS) or %TEMP%\dotnet_diag_*.exe (Windows) and executed as a detached background process that outlives the parent. The package ships a large decoy telemetry.js (81KB) to pad the size and appear legitimate.