MAL-2026-12584 Malicious code in checkout-pay-button-logic (npm)
Malicious package
Published
MAL-2026-12584 is a malicious package: checkout-pay-button-logic (npm). Every version was published to cause harm.
Task:
1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.
2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.
3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.
4. If the package is not used anywhere, say so and change nothing.
Reference: https://insights.sbomify.com/MAL-2026-12584/ (Markdown: https://insights.sbomify.com/MAL-2026-12584/index.md)
- Package
- checkout-pay-button-logic
- Registry
- npm
What is MAL-2026-12584?
MAL-2026-12584 is a malicious package in checkout-pay-button-logic, published on 5 Aug 2026.
Official description
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.
What should I do about MAL-2026-12584?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.