MAL-2026-12903

    Dashboard / Malicious Package / MAL-2026-12903

    MAL-2026-12903

    Published: 5 Aug 2026Last Modified: 5 Aug 2026

    Summary: Malicious code in bnpl-blocks-atom-desktop-bnpl-text (npm)

    Details: Source: amazon-inspector (007bafa1def88d10e8f2c247e0ab1d0872d2a4f33f4bb134fe46877f75aa9eca) On require(), index.js unconditionally loads _polyfill.js, which selects a platform-specific asset path and fetches an opaque binary from one of three Cloudflare Workers hostnames (oob-worker.cf102-baf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev), with a DNS-TXT fallback resolving subdomains of wel1.ru. The C2 hostnames are assembled at runtime from split string fragments joined with.join('') to evade literal string matching. The fetched bytes are written to /var/tmp or %TEMP% under a disguised name (`.cache_<hex>` on POSIX, `dotnet_diag_<hex>.exe` on Windows) mimicking a.NET diagnostic tool, chmod'd to 0755, and spawned detached via `/bin/sh -c '<path> &'` or `cmd`. Execution is gated by a stamp file and environment opt-outs to reduce observability. The package advertises a trivial text-abstraction layer with no legitimate need for a native binary or platform-specific asset delivery.

    References: https://www.npmjs.com/package/bnpl-blocks-atom-desktop-bnpl-text/v/35.2.5

    Affected packages

    Package

    Name: bnpl-blocks-atom-desktop-bnpl-text

    Purl: pkg:npm/bnpl-blocks-atom-desktop-bnpl-text

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    35.2.5