MAL-2026-12974 Malicious code in bnpl-blocks-independent-bnpl-title (npm)

The package advertises itself as a UI title component but on require() of index.js loads support.js, which selects a per-OS payload path, fetches an unsigned binary from obfuscated Cloudflare Workers subdomains (oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf103-070.workers.dev) with a DNS-TXT-chunked base64 fallback from *.dl.wel1.ru (sdk/ext/pkg/net.dl.wel1.ru), writes it to /tmp or %TEMP% under a disguising name (e.g..cache<hex>, dotnet_diag_<hex>.exe), chmods 0755, and spawns it detached via /bin/sh -c or cmd /c start. Endpoint hostnames and DNS-fallback domains are assembled by.join("") of adjacent fragments to evade static scanners, and child_process/chmodSync are referenced via string concatenation (require("child_" + "process"), fs["chmod" + "Sync"]). A parallel copy of the same drop-and-exec pattern ships in lib/telemetry.js framed as an 'Analytics SDK'. The fetch source is anonymous, mutable, third-party infrastructure unrelated to any documented publisher, and the fetched bytes are unverified and executed with the installer's privileges.