bigops-security@35.8.8

Analysis

bigops-security@35.8.8 executes a multi-stage dropper on require. index.js loads _bridge.js, which fingerprints the platform/architecture and downloads a second-stage binary over HTTPS from Cloudflare Workers hosts oob-worker[.]cf102-baf[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev, oob-worker[.]cf103-070[.]workers[.]dev, and oob-worker[.]cf100-416[.]workers[.]dev at arch-specific paths (/pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe). If HTTPS is blocked it falls back to a DNS TXT chunked-transfer exfil channel via c[.]sdk[.]dl[.]wel1[.]ru / sdk[.]dl[.]wel1[.]ru / ext[.]dl[.]wel1[.]ru / pkg[.]dl[.]wel1[.]ru / net[.]dl[.]wel1[.]ru. The downloaded payload is written to /tmp/.cache_<random> (or dotnet_diag_<random>.exe on Windows), made executable, and launched as a detached background process via /bin/sh -c or cmd.exe /c start /b. The package also ships lib/telemetry.js as a decoy analytics-SDK facade.