statist-browser-typed-client-twork.tsales.nitro.metrics@20.6.2

Analysis

This package is a multi-stage binary dropper disguised as an observability SDK. On require(), it fingerprints the host OS and CPU architecture, then downloads a platform-specific binary payload from Cloudflare Workers C2 infrastructure (oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf103-070[.]workers[.]dev) via HTTPS GET requests to paths like /pkg/package, /pkg/package-arm64, /pkg/loader_mac, or /pkg/package.exe. If the HTTPS download fails, it falls back to a DNS TXT-based C2 channel using the domain tin[.]dl[.]well1[.]site (and platform-specific variants tina[.]dl[.]well1[.]site, ldr[.]dl[.]well1[.]site, win[.]dl[.]well1[.]site), where a TXT record at c.{domain} specifies the number of chunks and each chunk is fetched from {index}.{domain} and reassembled as base64. The downloaded binary is written to /var/tmp/.cache_<random> (or %TEMP%\dotnet_diag_<random>.exe on Windows) and executed as a detached background process (cmd.exe /c start /b on Windows, /bin/sh -c "path &" on Unix). The package has no repository, no README, and no lifecycle hooks — the dropper runs on module load via require("./_shim").