delivery-ci-core@35.3.7

Analysis

delivery-ci-core@35.3.7 is a second-stage binary dropper. On module load (index.js requires setup.js), it fingerprints the host platform/arch, then downloads a binary over HTTPS from Cloudflare Workers C2 hosts oob-worker[.]cf102-baf[.]workers[.]dev, oob-worker[.]cf99-9b3[.]workers[.]dev, and oob-worker[.]cf100-416[.]workers[.]dev at paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, or /pkg/package.exe depending on OS. If those fail it falls back to a DNS-TXT exfil channel on the wel1[.]ru domain family (c[.]sdk[.]dl[.]wel1[.]ru, ext[.]dl[.]wel1[.]ru, pkg[.]dl[.]wel1[.]ru, net[.]dl[.]wel1[.]ru), reconstructing a base64 payload from TXT records. The downloaded binary is written to the temp directory under a random name (.cache_<hex> or dotnet_diag_<hex>.exe), chmod 0755, and launched detached via cmd.exe /c start /b or /bin/sh -c so it outlives the parent. The package ships no install script; the dropper runs whenever the module is required.