MAL-2026-13179 Malicious code in dolyame-ui-react-version-switch (npm)

Package advertises itself as a React UI helper but its index.js unconditionally require()s./vendor at load time. vendor.js selects a platform-specific asset path, fetches bytes over HTTPS from a randomly-ordered pool of string-split-obfuscated hosts assembled via.join('') (oob-worker.cf*.workers.dev and sdk/ext/pkg/net.dl.wel1.ru), with a DNS-TXT chunked-base64 fallback to bypass HTTPS filtering. The downloaded bytes are written to /tmp or %TEMP% under disguised names such as dotnet_diag<hex>.exe or.cache<hex>, chmod 0755'd on POSIX, and spawned detached via /bin/sh or cmd.exe. No hash verification is performed despite a cover-story comment claiming a SHA-256 integrity check. The package's declared 'interface elements' purpose is a cover story: index.js is a trivial no-op class stub, and the dropper is the only functional behavior.