Which versions of mms-simulation are malicious?

The following npm versions of mms-simulation are flagged malicious: 0.0.1-security, 1.0.0. Treat any of these as compromised.

How do I remediate mms-simulation if I installed it?

Remove mms-simulation 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 mms-simulation — how do I know if it already compromised me?

If mms-simulation 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 mms-simulation across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for mms-simulation (2 malicious versions).

Malicious package

mms-simulationnpm

Advisory published Oct 30, 2025Updated Oct 1, 2026

mms-simulation is a confirmed malicious npm package (MAL-2025-49230) that executes malicious code on install (malicious versions 0.0.1-security, 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in mms-simulation (npm)

MAL-2025-49230

Immediate action

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

npm uninstall mms-simulation

What this malware does

The package mms-simulation was found to contain malicious code.

Malicious versions

2 flagged

0.0.1-security1.0.0

Indicators of compromise (SHA-256)

b05f92c3ffc5ed97302ac873fd40030318d8d2d89d267c615a2b1309d5fd047b

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for mms-simulation (2 malicious versions).
If you installed it — respond
Remove mms-simulation 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 mms-simulation 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. mms-simulation on npm has been identified as a malicious package (versions 0.0.1-security, 1.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks mms-simulation-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

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