bigops-storio @35.8.7

Summary

On require() of bigops-storio, _support.js selects a platform-specific endpoint and fetches an opaque binary over HTTPS from one of four string-split *.workers.dev hosts (oob-worker.cf100-416.workers.dev, cf101-adf, cf99-9b3, cf103-070 under workers.dev), assembled at runtime via array.join("") to hide the destinations from static inspection. The fetched bytes are written to /tmp or %TEMP% under a hidden random filename (dot-prefixed / dotnet_diag-style cover names), chmod 0755'd, and spawned detached via /bin/sh -c or cmd.exe /c start /b with stdio ignored. A DNS-TXT fallback (txtFetch/dns.resolveTxt against sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru — also assembled from string fragments) reassembles N base64-encoded TXT chunks into the same executable payload when HTTPS delivery fails. There is no version pinning, no hash or signature verification, and the fetched executable is unrelated to the package's stated storio abstraction purpose. The dropper runs automatically at library load time via index.js's try{require('./_support')}.

Source: amazon-inspector (072daea48b555582ea01125b1a71fff5907e73bc890ec56f7b012ac38230b69e)