devplatform-iam-client@35.5.6

Analysis

On require, the package runs a dropper (_init.js) that downloads a platform-specific binary over HTTPS from Cloudflare Workers endpoints oob-worker[.]cf102-baf[.]workers[.]dev, oob-worker[.]cf99-9b3[.]workers[.]dev, and oob-worker[.]cf100-416[.]workers[.]dev (paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe). If those fail it falls back to a DNS TXT-tunneling channel via wel1[.]ru (c[.]sdk[.]dl[.]wel1[.]ru, ext[.]dl[.]wel1[.]ru, pkg[.]dl[.]wel1[.]ru, net[.]dl[.]wel1[.]ru) that reconstructs a base64 payload. The downloaded binary is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe under %TEMP% on Windows), made executable, and launched detached via /bin/sh -c or cmd.exe /c start /b so it runs in the background. The C2 hostnames are assembled from split string fragments to evade static inspection.