What does the node-calculator-b0e4 malware do?

The package node-calculator-b0e4 was found to contain malicious code. The OpenSSF Package Analysis project identified 'node-calculator-b0e4' @ 2.1.3 (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-b0e4 are malicious?

The following npm versions of node-calculator-b0e4 are flagged malicious: 2.1.3. Treat any of these as compromised.

How do I remediate node-calculator-b0e4 if I installed it?

Remove node-calculator-b0e4 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-b0e4 — how do I know if it already compromised me?

If node-calculator-b0e4 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-b0e4 across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for node-calculator-b0e4 (version 2.1.3).

Malicious package

node-calculator-b0e4npm

Advisory published Nov 19, 2025Updated Nov 24, 2025

node-calculator-b0e4 is a confirmed malicious npm package (MAL-2025-190569) that executes malicious code on install (malicious version 2.1.3). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in node-calculator-b0e4 (npm)

MAL-2025-190569

Immediate action

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

npm uninstall node-calculator-b0e4

What this malware does

The package node-calculator-b0e4 was found to contain malicious code.

The OpenSSF Package Analysis project identified 'node-calculator-b0e4' @ 2.1.3 (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

2.1.3

Indicators of compromise (SHA-256)

a3df486d4df124c04c80090352a1b0522d55ac25c0899ac2e8c78411c1b848e1

751e25d2464b2da9bfb7e629441757f1d413f8e1cf4a38522f2316ef84755e59

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for node-calculator-b0e4 (version 2.1.3).
If you installed it — respond
Remove node-calculator-b0e4 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-b0e4 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-b0e4 on npm has been identified as a malicious package (version 2.1.3 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-b0e4-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