constructor-blocks-mailings@35.5.7

Analysis

On require, this package executes a multi-stage dropper. It downloads a platform-specific binary over HTTPS from Cloudflare Workers endpoints (oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev, paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe), with a DNS-tunneling fallback that reads a chunk count from a TXT record at c[.]sdk[.]dl[.]wel1[.]ru and reassembles base64 data from numbered subdomains of wel1[.]ru. The downloaded payload is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe in the temp dir on Windows), made executable, and launched as a detached background process (/bin/sh -c 'file &' or cmd.exe /c start /b).