MAL-2026-12912 Malicious code in bnpl-blocks-desktop-bnpl-anchor-title (npm)

On require() of this package, _bootstrap.js downloads a platform-specific binary from author-controlled Cloudflare Workers hosts (oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev) and fallback hosts under dl.wel1.ru (sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru), writes it to a temp path, sets it executable (chmod 0755), and spawns it detached via /bin/sh -c (with a cmd branch for Windows). The destination hostnames and API names are reassembled at runtime from split string fragments (e.g. ["oob-wo","rker.cf1","01-adf",".wo","rkers",".dev"].join(""), fs["chmod"+"Sync"]) to evade literal-string scanning. The binary is fetched unpinned and unverified from non-publisher infrastructure; the package presents an analytics/telemetry cover story. lib/telemetry.js contains parallel dropper primitives (base64-chunked reassembly, chmod-to-755, detached /bin/sh spawn) as a staged variant.

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.