Which versions of node-calculator-c213 are malicious?

The following npm versions of node-calculator-c213 are flagged malicious: 1.0.6. Treat any of these as compromised.

How do I remediate node-calculator-c213 if I installed it?

node-calculator-c213 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 node-calculator-c213 — how do I know if it already compromised me?

If node-calculator-c213 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-c213 across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for node-calculator-c213 (version 1.0.6).

Malicious package

node-calculator-c213npm

Advisory published Nov 17, 2025Updated Nov 17, 2025

node-calculator-c213 is a confirmed malicious npm package (MAL-2025-190523) that opens a backdoor for remote access (malicious version 1.0.6). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in node-calculator-c213 (npm)

MAL-2025-190523

Immediate action

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

npm uninstall node-calculator-c213

What this malware does

The package node-calculator-c213 was found to contain malicious code.

The OpenSSF Package Analysis project identified 'node-calculator-c213' @ 1.0.6 (npm) as malicious.

It is considered malicious because:

The package communicates with a domain associated with malicious activity.

Malicious versions

1 flagged

1.0.6

Indicators of compromise (SHA-256)

0826fe9097502f34a482a5353039b22f2408b6bd743b1f821576d6e87da1c624

ea9aa404312edd44fdddfae5d4815b452d286fd3a0510ccdfd8f9f03a61c007c

Detection & response playbook

Backdoor / remote access

Find it
Search your lockfiles and build artifacts for node-calculator-c213 (version 1.0.6).
If you installed it — respond
node-calculator-c213 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 node-calculator-c213 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-c213 on npm has been identified as a malicious package (version 1.0.6 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-c213-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

All malware advisories How O3 detects malware Vulnerability database