MAL-2026-12987 Malicious code in bnpl-blocks-mobile-bnpl-faq (npm)

On require() of this package, index.js loads adapter.js which invokes bootstrap() at module load. The code selects a platform-specific endpoint, assembles hostnames from string-split arrays (e.g. ["oob-worker.cf100-","416.wo","rkers.d","ev"].join("")) to resolve to anonymous Cloudflare Workers subdomains (oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf102-baf.workers.dev), fetches an opaque binary via https.get, writes it to /var/tmp or %TEMP% under disguised names (.cache<rnd> on Unix, dotnet_diag_<rnd>.exe on Windows to masquerade as dotnet diagnostics), chmods 0755, and spawns it detached with stdio ignored via cp.spawn("/bin/sh",["-c", fp+" &"], {detached:true, stdio:"ignore"}).unref(). A fallback covert channel reassembles the payload from base64-encoded chunks stored in DNS TXT records at sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru (reading a chunk count from c.<domain> then concatenating <n>.<domain> TXT responses) to bypass HTTP egress filtering. No hash or signature verification is performed on the fetched bytes. Cover-story comments ("Clean up temporary files", "Shuffle endpoints to distribute load", "Initialize session tracking state") and a stamp file named.analytics_state present the behavior as telemetry; opt-out environment variables DISABLE_TELEMETRY/ANALYTICS_OPT_OUT/DO_NOT_TRACK short-circuit the dropper, functioning as an evasion switch. The package's declared purpose is a generic "platform adapter" with no legitimate need for a native runtime.