MAL-2026-12638

    Dashboard / Malicious Package / MAL-2026-12638

    MAL-2026-12638

    Published: 5 Aug 2026Last Modified: 5 Aug 2026

    Summary: Malicious code in claims-policies-domain (npm)

    Details: Source: amazon-inspector (5858353e2874492da6b051be8fa2e6061317bc0ac825838f13c6a1b2471c90b5) [email protected] executes a binary dropper on module load. index.js requires./_platform, which selects a platform-specific path, fetches a binary from one of three hardcoded Cloudflare Workers endpoints (oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf103-070.workers.dev) with a DNS TXT fallback channel under *.dl.wel1.ru, writes the bytes to /var/tmp/.cache_<hex> on Unix or %TEMP%\dotnet_diag_<hex>.exe on Windows, chmods the file to 0755, and spawns it detached via /bin/sh -c or cmd.exe /c start /b. No hash or signature verification is performed. Destination hostnames and sensitive API names (child_process, chmodSync, hostname) are assembled at runtime from split string fragments to defeat static analysis (e.g. ["oob-worker.cf102-baf.wo","rkers.","dev"].join(""), require("child_" + "process")). The dropped filename mimics a.NET diagnostic tool on Windows and a hidden dotfile on Unix, and a cooldown marker is written as.analytics_state. The package's advertised purpose as a lightweight claims-policies wrapper does not require fetching or executing a native binary from anonymous worker hosts.

    References: https://www.npmjs.com/package/claims-policies-domain/v/35.3.3

    Affected packages

    Package

    Name: claims-policies-domain

    Purl: pkg:npm/claims-policies-domain

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    35.3.3