What does the os-numpy malware do?

The OpenSSF Package Analysis project identified 'os-numpy' @ 3.19.4 (pypi) as malicious. It is considered malicious because: - The package communicates with a domain associated with malicious activity.

Which versions of os-numpy are malicious?

The following PyPI versions of os-numpy are flagged malicious: 3.19.4. Treat any of these as compromised.

How do I remediate os-numpy if I installed it?

Remove os-numpy 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 os-numpy — how do I know if it already compromised me?

If os-numpy 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 os-numpy across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for os-numpy (version 3.19.4).

Malicious package

os-numpyPyPI

os-numpy is a confirmed malicious PyPI package (MAL-2023-1384) that executes malicious code on install (malicious version 3.19.4). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in os-numpy (PyPI)

MAL-2023-1384

Immediate action

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

pip uninstall os-numpy

What this malware does

The OpenSSF Package Analysis project identified 'os-numpy' @ 3.19.4 (pypi) as malicious.

It is considered malicious because:

The package communicates with a domain associated with malicious activity.

Malicious versions

1 flagged

3.19.4

Indicators of compromise (SHA-256)

40ad87c585abfe0e853406f3417eab643e74d78e36679be13bdc5445899d5397

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for os-numpy (version 3.19.4).
If you installed it — respond
Remove os-numpy 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 os-numpy 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. os-numpy on PyPI has been identified as a malicious package (version 3.19.4 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Credits

OpenSSF: Package Analysis · finder

Detect & block this

O3 blocks os-numpy-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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