devplatform-integrations-tests-lib@35.2.5

Analysis

devplatform-integrations-tests-lib@35.2.5 is a multi-stage dropper disguised as a testing utility. On require, index.js loads _bootstrap.js, which fingerprints the OS/architecture and downloads a platform-specific second-stage binary over HTTPS from Cloudflare Workers endpoints (oob-worker[.]cf101-adf[.]workers[.]dev, oob-worker[.]cf103-070[.]workers[.]dev, oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev) at paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, or /pkg/package.exe. If the HTTPS download fails it falls back to a DNS-TXT exfiltration channel under dl[.]wel1[.]ru (c[.]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) and executed detached via /bin/sh -c or cmd.exe /c start /b, so it runs in the background and outlives the parent process. A cache stamp suppresses re-download for ~5.6 hours.