MAL-2026-12584

    Dashboard / Malicious Package / MAL-2026-12584

    MAL-2026-12584

    Published: 5 Aug 2026Last Modified: 5 Aug 2026

    Summary: Malicious code in checkout-pay-button-logic (npm)

    Details: Source: amazon-inspector (9d4bf54bc4e3750c7e9bc6ef385108c37ee00b486858c0576585ef2f88780385) On require, index.js invokes _helpers.js which selects a per-OS payload path, fetches a native binary over HTTPS from string-split-obfuscated Cloudflare Workers hostnames (oob-worker.cf103-070.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev) with a DNS-TXT base64 fallback via sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru, writes it to /tmp/.cache_<hex> or %TEMP%\dotnet_diag_<hex>.exe, chmods 0755, and detached-spawns it via /bin/sh -c or cmd.exe /c start /b. Destination hostnames and fallback resolvers are assembled by joining split string fragments to evade static scanners, and the dropped file uses cover-story names (analytics_state, dotnet_diag). Reads DISABLE_TELEMETRY / ANALYTICS_OPT_OUT / DO_NOT_TRACK to mimic a legitimate telemetry opt-out. Behavior is unrelated to the package's stated purpose.

    References: https://www.npmjs.com/package/checkout-pay-button-logic/v/35.3.8

    Affected packages

    Package

    Name: checkout-pay-button-logic

    Purl: pkg:npm/checkout-pay-button-logic

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    35.3.8
    MAL-2026-12584 | CVE-DB