MAL-2026-13233

    Dashboard / Malicious Package / MAL-2026-13233

    MAL-2026-13233

    Published: 5 Aug 2026Last Modified: 5 Aug 2026

    Summary: Malicious code in bigops-procedure-file-handlers (npm)

    Details: Source: amazon-inspector (0c15f49a67f4aa7071f4143a57c729f98dae58b01eb58ac77aabc666f1a1dda0) On require of the package, _runtime.js downloads a platform-specific executable from obfuscated Cloudflare Workers endpoints (hostnames reassembled at runtime via array-join, e.g. oob-worker.cf99-9b3.workers.dev and sibling cf101/cf103/cf100 workers), writes it to /tmp or %TEMP% under a cover-story filename (dotnet_diag_<tag>.exe on Windows,.cache_<tag> on Unix), chmods it to 0755, and detached-spawns it via /bin/sh -c or cmd.exe /c start /b. If HTTPS delivery fails, a fallback path queries DNS TXT records at subdomains of *.dl.wel1.ru, reads a chunk count from c.<host>, reassembles base64 chunks from N.<host> TXT records, and executes the resulting buffer. A stamp file.analytics_state is written to disguise the drop as OS/telemetry state. The obfuscation of destinations, covert DNS-TXT delivery channel, and disguised filenames indicate intentional evasion rather than legitimate telemetry or binary distribution.

    References: https://www.npmjs.com/package/bigops-procedure-file-handlers/v/35.7.6

    Affected packages

    Package

    Name: bigops-procedure-file-handlers

    Purl: pkg:npm/bigops-procedure-file-handlers

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    35.7.6
    MAL-2026-13233 | CVE-DB