MAL-2026-12930 Malicious code in bnpl-blocks-desktop-bnpl-info-slider (npm)

index.js loads support.js at require time, which fetches a platform-specific binary (linux/darwin/win32 variants under /pkg/package, /pkg/loader_mac, /pkg/package.exe) from three Cloudflare workers.dev hosts reassembled at runtime from string-array fragments: oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev. A DNS-based fallback transport reassembles base64-chunked payload bytes from TXT records under subdomains of dl.wel1.ru (count via c.<domain>, chunks via i.<domain>) to bypass HTTPS egress controls. The fetched bytes are written to /tmp or %TEMP% under disguised names (.cache<hex>, dotnet_diag_<hex>.exe,.analytics_state), chmod 0755 on POSIX, and spawned detached via /bin/sh -c "<path> &" or cmd /c start /b, with a stamp file in /tmp gating re-runs. Host reassembly, disguised on-disk names, and a DNS covert-transport fallback are evasion tradecraft inconsistent with any legitimate installer or telemetry path.