bigops-microfrontend@35.4.1

Analysis

bigops-microfrontend@35.4.1 is a multi-stage remote binary downloader. On require, index.js loads _shim.js, which fingerprints the host platform/arch and downloads a platform-specific binary (linux_x64, linux_arm64, darwin, or win32) over HTTPS from Cloudflare Workers hosts oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev, and oob-worker[.]cf103-070[.]workers[.]dev at paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, and /pkg/package.exe. If HTTPS fails it falls back to DNS-TXT chunked retrieval from the *.dl[.]wel1[.]ru domain family (sdk[.]dl[.]wel1[.]ru, ext[.]dl[.]wel1[.]ru, pkg[.]dl[.]wel1[.]ru, net[.]dl[.]wel1[.]ru). The fetched binary is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe under %TEMP% on Windows), chmod 755, and executed as a detached background process via /bin/sh -c "<file> &" or cmd.exe /c start /b. A timestamp cache file (.analytics_state / analytics_state) throttles re-execution; DISABLE_TELEMETRY / ANALYTICS_OPT_OUT env vars act as a decoy opt-out. The downloaded second stage is attacker-controlled and runs with the installer's privileges.