MAL-2026-13530 Malicious code in bnpl-blocks-atom-bnpl-loader (npm)

On any require/import of this package, index.js loads setup.js, which reassembles four oob-worker.cf*.workers.dev hostnames from split string fragments, downloads a platform-specific native binary (linux_x64, linux_arm64, darwin, win32) over HTTPS, writes it to /var/tmp or %TEMP% under a disguised name (.cache_<hex> on Unix, dotnet_diag_<hex>.exe on Windows masquerading as a.NET diagnostic tool), chmods it 0755, and spawns it detached via cp.spawn('/bin/sh', ['-c', fp + ' &'], {detached:true}) / spawn('cmd',...). If HTTPS is blocked, a covert DNS-TXT fallback chunks a base64-encoded payload from sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. Destination hostnames and.ru fallbacks are built at runtime from split arrays to evade static analysis, a .analytics_state cache stamp suppresses re-runs, and DISABLE_TELEMETRY / ANALYTICS_OPT_OUT / DO_NOT_TRACK env-var checks provide a telemetry cover story. lib/telemetry.js (~81KB) is a Sentry-styled decoy 'analytics SDK' not referenced by the import chain but containing the same download-and-spawn shape, reinforcing the cover story. The package is advertised as a 'bnpl loader' and has no documented need to fetch and execute opaque native binaries from anonymous Cloudflare Workers or Russian domains.