devplatform-snarkdown@35.2.1

Analysis

devplatform-snarkdown@35.2.1 is a multi-stage dropper disguised as a telemetry/analytics module. On require, index.js loads _shim.js, which downloads a platform-specific binary over HTTPS from Cloudflare Workers endpoints oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf103-070[.]workers[.]dev, and oob-worker[.]cf99-9b3[.]workers[.]dev (paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe). If the download fails it falls back to a DNS TXT exfiltration channel: it queries c[.]sdk[.]dl[.]wel1[.]ru for a chunk count, then retrieves base64-encoded chunks from per-index TXT records under sdk[.]dl[.]wel1[.]ru. The fetched payload is written to /var/tmp/.cache_<hex> (or %TEMP%\dotnet_diag_<hex>.exe on Windows), made executable, and launched detached via /bin/sh -c "<path> &" or cmd.exe /c start /b so it runs in the background independent of the parent process. The package name impersonates the legitimate 'snarkdown' markdown library.