What does the node-calculator-cf8c malware do?

The package node-calculator-cf8c was found to contain malicious code. The OpenSSF Package Analysis project identified 'node-calculator-cf8c' @ 2.1.2 (npm) as malicious. It is considered malicious because: - The package communicates with a domain associated with malicious activity. - The package executes one or more commands associated with malicious behavior.

Which versions of node-calculator-cf8c are malicious?

The following npm versions of node-calculator-cf8c are flagged malicious: 2.1.2. Treat any of these as compromised.

How do I remediate node-calculator-cf8c if I installed it?

Remove node-calculator-cf8c 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 activity or persistence.

I already installed node-calculator-cf8c — how do I know if it already compromised me?

If node-calculator-cf8c 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.

How do I find node-calculator-cf8c across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for node-calculator-cf8c (version 2.1.2).

Malicious package

node-calculator-cf8cnpm

Advisory published Nov 19, 2025Updated Nov 24, 2025

node-calculator-cf8c is a confirmed malicious npm package (MAL-2025-190578) that executes malicious code on install (malicious version 2.1.2). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in node-calculator-cf8c (npm)

MAL-2025-190578

Immediate action

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

npm uninstall node-calculator-cf8c

What this malware does

The package node-calculator-cf8c was found to contain malicious code.

The OpenSSF Package Analysis project identified 'node-calculator-cf8c' @ 2.1.2 (npm) as malicious.

It is considered malicious because:

The package communicates with a domain associated with malicious activity.
The package executes one or more commands associated with malicious behavior.

Malicious versions

1 flagged

2.1.2

Indicators of compromise (SHA-256)

c9c84dee863fae35e3837b12bae394f4762d2ed613ce10bf6cef759c45533c66

4da96ce055040828362e8a000e3ad2e1a1647b7d3faa0c4383c260d6044bef7d

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for node-calculator-cf8c (version 2.1.2).
If you installed it — respond
Remove node-calculator-cf8c 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 activity or persistence.
Did it already run?
If node-calculator-cf8c 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. node-calculator-cf8c on npm has been identified as a malicious package (version 2.1.2 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Credits

Amazon Inspector · finder
OpenSSF: Package Analysis · finder

Detect & block this

O3 blocks node-calculator-cf8c-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.

Malware detection Runtime egress monitoring

Explore

All malware advisories How O3 detects malware Vulnerability database