MAL-2026-13295

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## Source: amazon-inspector (539999c456d5c8a3f5e2028b9bd7a0f8ca3ab41af3c67044ef7735e0c9f76845) On require, _polyfill.js selects a platform-specific payload, fetches an executable from one of three Cloudflare Workers hosts whose names are assembled at runtime from split string arrays to evade static matching (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf102-baf.workers.dev), with a DNS-TXT chunked base64 fallback via sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru. The fetched binary is written to /var/tmp or %TEMP% under a disguised name (.cache_<rnd> on POSIX, dotnet_diag_<rnd>.exe on Windows), chmod 0755, and detach-spawned via /bin/sh -c or cmd.exe, with stderr suppressed. The package name is unrelated to the observed behavior; endpoint obfuscation, disguised filenames, opt-out env-var checks, and detached spawning are consistent with a stealth remote-code-execution dropper that runs on any host that installs and imports the package.