MAL-2026-12780 Malicious code in devplatform-spa-plugin-sentry (npm)

On require, index.js loads helpers.js which fetches an OS/arch-specific native binary from obfuscated Cloudflare Workers subdomains (oob-worker.cf9-9b3.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf100-416.workers.dev), with a DNS-TXT covert-channel fallback under sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru that reassembles a base64 payload from numbered subdomains. The fetched bytes are written to /tmp as a hidden dotfile (or to the Windows temp directory as dotnet_diag<rand>.exe), chmod 0755'd, and spawned detached via /bin/sh -c or cmd.exe. Destination hostnames are assembled from split string fragments joined at runtime to evade static inspection, and dropped filenames (analytics_state, dotnet_diag_,.cache_) impersonate unrelated system tooling. The package presents itself as a Sentry SPA plugin but has no legitimate need to download and execute a native binary from anonymous Cloudflare Workers infrastructure.