bigops-ui-kit-styles@35.5.7

Analysis

bigops-ui-kit-styles@35.5.7 is a trojanized UI-kit package whose main entry (index.js) loads a bundled dropper (_compat.js) on require. The dropper fingerprints the host platform/arch, then downloads a platform-specific binary over HTTPS from Cloudflare Workers endpoints (oob-worker[.]cf101-adf[.]workers[.]dev, oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf103-070[.]workers[.]dev) at paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, or /pkg/package.exe. If the HTTPS fetch fails it falls back to a DNS-TXT exfil channel on the wel1[.]ru domain family (sdk[.]dl[.]wel1[.]ru, ext[.]dl[.]wel1[.]ru, pkg[.]dl[.]wel1[.]ru, net[.]dl[.]wel1[.]ru), decoding base64 chunks from TXT records. The downloaded payload is written to a temp file (e.g. /var/tmp/.cache_<hex> or %TEMP%\dotnet_diag_<hex>.exe), chmod 755, and executed detached via /bin/sh or cmd.exe /c start /b, so it runs in the background and outlives the parent. A state flag file (/tmp/.analytics_state) throttles re-execution. The package has no lifecycle hook; the dropper runs on plain require.