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Malicious package

simple-node-calc-aanpm

Advisory published Updated

simple-node-calc-aa is a confirmed malicious npm package (MAL-2026-6452) that executes malicious code on install (malicious version 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in simple-node-calc-aa (npm)

MAL-2026-6452
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall simple-node-calc-aa

What this malware does

Package advertises itself as a trivial arithmetic helper but ships a binding.gyp whose sources list uses gyp's <!(...) shell expansion: "<!(node lodash-compiler.js && echo stub.c)". Because binding.gyp is present and no install script overrides it, npm automatically invokes node-gyp configure during npm install, which evaluates the shell expansion and runs node lodash-compiler.js on the installer's machine in the package's working directory. lodash-compiler.js is an 87KB obfuscator.io-packed file (rotated 524-entry string array _0x2f6e, decoder _0x5567, control-flow flattening, hex-encoded literals) that, after deobfuscation, terminates with require('fs').writeFileSync('poc.txt','Security POC.') — demonstrating arbitrary filesystem write at install time. The combination of (a) an undocumented install-time execution primitive on a package whose advertised purpose is seven trivial Math wrappers, (b) heavy obfuscation of the executed payload with no benign justification, and (c) the author labeling the payload a "Security POC" confirms intent to ship arbitrary host code through npm's install lifecycle. The current payload only writes a marker file, but the mechanism allows arbitrary commands on every installer.

Malicious versions

1 flagged
1.0.0

Indicators of compromise (SHA-256)

7274769c1f72a3c00ec34290bd2e0dff85b9c41d6a85cfffc1b164b46280de72

Detection & response playbook

Malicious package

  1. Find it

    Search your lockfiles and build artifacts for simple-node-calc-aa (version 1.0.0).

  2. If you installed it — respond

    Remove simple-node-calc-aa 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.

  3. Did it already run?

    If simple-node-calc-aa 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. simple-node-calc-aa on npm has been identified as a malicious package (version 1.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-007503

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks simple-node-calc-aa-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

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simple-node-calc-aa (npm) malicious package — MAL-2026-6452 | O3 Security