MAL-2026-12632

    Dashboard / Malicious Package / MAL-2026-12632

    MAL-2026-12632

    Published: 5 Aug 2026Last Modified: 5 Aug 2026

    Summary: Malicious code in claims-payout-offer-api (npm)

    Details: Source: amazon-inspector (249e26d075d4551f9259568bb4029db870432feca831cb4cf7d26ffb7318605b) On require() of the package, index.js loads _polyfill.js which reconstructs C2 hostnames from split string fragments (oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev), with a DNS-TXT base64 code-channel fallback via sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The code selects a platform-specific payload, downloads it via https.get, writes it under a disguised name (e.g. dotnet_diag_*.exe on Windows,.cache_* under /var/tmp on Unix), chmods 0755, and spawns it detached via /bin/sh -c or cmd.exe /c start. A sibling lib/telemetry.js duplicates the same dropper logic. Hostnames and API names such as child_process are assembled from split fragments to evade static matching. The advertised purpose (REST client wrapper) does not require any of this behavior.

    References: https://www.npmjs.com/package/claims-payout-offer-api/v/35.7.6

    Affected packages

    Package

    Name: claims-payout-offer-api

    Purl: pkg:npm/claims-payout-offer-api

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    35.7.6
    MAL-2026-12632 | CVE-DB