tinkoff-statist-browser-typed-client-sme.users.origination.web@20.6.2

Analysis

This package is a multi-stage binary dropper disguised as a Tinkoff Bank internal web interface. On require(), _loader.js fetches a platform-specific binary payload from Cloudflare Workers C2 infrastructure (oob-worker[.]cf102-baf[.]workers[.]dev, oob-worker[.]cf103-070[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev) via HTTPS GETs to /pkg/package (or /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe depending on OS/arch). It also uses DNS TXT queries to c[.]tin[.]dl[.]well1[.]site as a fallback C2 channel. The downloaded binary is written to /var/tmp/.cache_<randomhex> (Linux/macOS) or %TEMP%\dotnet_diag_<randomhex>.exe (Windows) and spawned as a detached background process. The package collects host metadata (platform, arch, hostname, CPU count, memory) and uses a stamp file at /tmp/.analytics_state or %TEMP%\analytics_state to limit re-execution frequency. A large decoy telemetry SDK (lib/telemetry.js) is included to make the package appear legitimate. The package has no repository, no README, and no lifecycle scripts — the payload runs on module load via index.js.