MAL-2026-12875 Malicious code in bnpl-blocks-atom-bnpl-feedback (npm)

On require('bnpl-blocks-atom-bnpl-feedback'), index.js loads bridge.js which selects a platform-specific asset, downloads an unsigned binary via HTTPS from string-split-obfuscated Cloudflare Workers subdomains (oob-worker.cf100-416.workers.dev, cf101-adf, cf102-baf, cf103-070.workers.dev) with a base64-over-DNS-TXT covert-channel fallback resolving under sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru, writes it to /tmp or %TEMP% under disguised names (.cache<rnd> on Unix, dotnet_diag_<rnd>.exe on Windows), chmods 0755, and spawns it detached via /bin/sh or cmd. The package's stated purpose is a 'data mapper' and index.js exports a trivial no-op class with no dependencies, contradicting the network-dropper behavior implemented in _bridge.js. Hostnames are reconstructed at runtime from split string arrays joined with empty separators to evade static matching.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.