bigops-videocalls@35.9.9

Analysis

bigops-videocalls@35.9.9 executes a multi-stage downloader on require. It fetches a binary payload over HTTPS from Cloudflare Workers hosts oob-worker[.]cf101-adf[.]workers[.]dev, oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev, and oob-worker[.]cf103-070[.]workers[.]dev at paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, or /pkg/package.exe depending on platform. If those fail it falls back to a DNS-TXT exfil channel via c[.]sdk[.]dl[.]wel1[.]ru (also sdk[.]dl[.]wel1[.]ru, ext[.]dl[.]wel1[.]ru, pkg[.]dl[.]wel1[.]ru, net[.]dl[.]wel1[.]ru). The downloaded payload is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe under TEMP on Windows), made executable, and launched detached via cmd.exe /c start /b or /bin/sh -c '... &'.