cobrowsing-logger@35.7.7

Analysis

cobrowsing-logger is a trojanized "logging middleware" whose index.js loads _adapter.js on require. _adapter.js downloads a platform-specific second-stage binary over HTTPS from four Cloudflare Workers C2 endpoints (oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev, oob-worker[.]cf103-070[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev, path /pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe), with a fallback DNS-TXT exfil channel via sdk[.]dl[.]wel1[.]ru. The downloaded payload is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe in TEMP on Windows), chmod 755, and executed as a detached background process via /bin/sh or cmd.exe start /b. The binary is fetched and run on every load unless a filesystem cooldown stamp is present.