MAL-2026-12932 Malicious code in bnpl-blocks-desktop-bnpl-navigation (npm)

On require of the package, index.js loads runtime.js which selects a platform-specific endpoint, downloads an opaque binary over HTTPS from obfuscated Cloudflare Worker hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf99-9b3.workers.dev), writes it to a hidden temp path (e.g.,.cache, dotnet_diag_.exe under /tmp), chmods 0755, and spawns it detached via /bin/sh or cmd. Destination hostnames are constructed by array-join (e.g., ["oob-worker.cf100-416.workers.d","ev"].join("")) to defeat static string scanning. If HTTPS fetch fails, the loader falls back to a DNS-TXT covert channel: it queries c.<domain> under *.dl.wel1.ru (sdk/ext/pkg/net) for a chunk count and reassembles base64 payload from numbered TXT records, executing the reassembled bytes identically. A mirrored copy of the dropper exists in lib/telemetry.js and additionally hides child_process via require("child_"+"process"). The fetched binary is unpinned and unverified; content is attacker-controlled and executed with the installer's privileges.