Which versions of coremsft are malicious?

The following PyPI versions of coremsft are flagged malicious: 0.1, 0.2. Treat any of these as compromised.

How do I remediate coremsft if I installed it?

coremsft is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

I already installed coremsft — how do I know if it already compromised me?

If coremsft 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.

Is coremsft part of a known attack campaign?

Yes — coremsft is associated with the GENERIC-standard-pypi-install-pentest campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

How do I find coremsft across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for coremsft (2 malicious versions).

Malicious package

coremsftPyPI

Advisory published Dec 4, 2025Updated Dec 5, 2025

coremsft is a confirmed malicious PyPI package (MAL-2025-192302) that steals credentials and exfiltrates sensitive data (malicious versions 0.1, 0.2). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in coremsft (PyPI)

MAL-2025-192302

Immediate action

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

pip uninstall coremsft

What this malware does

Installing the package or importing the module exfiltrates basic information about the host, and the package has no other purpose.

Category: PROBABLY_PENTEST - Packages looking like typical pentest packages, but also anything that looks like testing, exploring pre-prepared kits, research & co, with clearly low-harm possibilities.

Campaign: GENERIC-standard-pypi-install-pentest

Reasons (based on the campaign):

The package contains code to exfiltrate basic data from the system, like IP or username. It has a limited risk.
The package overrides the install command in setup.py to execute malicious code during installation.

Malicious versions

2 flagged

0.10.2

Indicators of compromise (SHA-256)

c8eaed1685f9346b5e86fd47bb3359843533e558e34995d405dd903df8e23c4e

a23b4ba3c205ab98529f3202d3c78a7d91a5f3c8b057b07b9571feb555cd9c87

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for coremsft (2 malicious versions).
If you installed it — respond
coremsft is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.
Did it already run?
If coremsft 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. coremsft on PyPI has been identified as a malicious package (versions 0.1, 0.2 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

GENERIC-standard-pypi-install-pentest

References

bad-packages.kam193.eu

Credits

Kamil Mańkowski (kam193) · reporter

Detect & block this

O3 blocks coremsft-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring

Explore

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