What does the node-calculator-f4d5 malware do?

The package node-calculator-f4d5 was found to contain malicious code. The OpenSSF Package Analysis project identified 'node-calculator-f4d5' @ 2.3.0 (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-f4d5 are malicious?

The following npm versions of node-calculator-f4d5 are flagged malicious: 2.3.0. Treat any of these as compromised.

How do I remediate node-calculator-f4d5 if I installed it?

Remove node-calculator-f4d5 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-f4d5 — how do I know if it already compromised me?

If node-calculator-f4d5 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-f4d5 across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for node-calculator-f4d5 (version 2.3.0).

Malicious package

node-calculator-f4d5npm

Advisory published Nov 17, 2025Updated Nov 17, 2025

node-calculator-f4d5 is a confirmed malicious npm package (MAL-2025-190515) that executes malicious code on install (malicious version 2.3.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in node-calculator-f4d5 (npm)

MAL-2025-190515

Immediate action

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

npm uninstall node-calculator-f4d5

What this malware does

The package node-calculator-f4d5 was found to contain malicious code.

The OpenSSF Package Analysis project identified 'node-calculator-f4d5' @ 2.3.0 (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

2.3.0

Indicators of compromise (SHA-256)

64e687d1fc2144f2d19f9e6ee10f4db75f7df024dccb7e96f382b53d3f84930c

342de6f4f54c5a0a4df856c6dc87100b08337f11e82519b0cc2e99c90b26c9f0

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for node-calculator-f4d5 (version 2.3.0).
If you installed it — respond
Remove node-calculator-f4d5 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-f4d5 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-f4d5 on npm has been identified as a malicious package (version 2.3.0 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-f4d5-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