Which versions of py-sys-utils are malicious?

The following PyPI versions of py-sys-utils are flagged malicious: 3.0.1, 3.2.4. Treat any of these as compromised.

How do I remediate py-sys-utils if I installed it?

py-sys-utils 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 py-sys-utils — how do I know if it already compromised me?

If py-sys-utils 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 py-sys-utils part of a known attack campaign?

Yes — py-sys-utils is associated with the RLMA-2025-04801, GENERIC-standard-pypi-install-pentest, RLUA-2026-00618 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 py-sys-utils across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for py-sys-utils (2 malicious versions).

Malicious package

py-sys-utilsPyPI

Advisory published Aug 23, 2025Updated Mar 19, 2026

py-sys-utils is a confirmed malicious PyPI package (MAL-2025-47794) that steals credentials and exfiltrates sensitive data (malicious versions 3.0.1, 3.2.4). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in py-sys-utils (PyPI)

MAL-2025-47794

Immediate action

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

pip uninstall py-sys-utils

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

3.0.13.2.4

Indicators of compromise (SHA-256)

2996d0ca23390a89d9cef8c29bf840293236cfd0b2f3925f1b70aa0dc6114b7a

35d95f5426d289821cfffb82d4f55cf23c78e58a1f4ea2e4dc11ea09fea11a90

0f9d0b03bfee3afe8585a595eb40b5bb3d9d59db389bc864641b19aadd6bb764

7b206069b60b701f297970d529712bca200ad45f535c678a46cc3cc182c77027

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for py-sys-utils (2 malicious versions).
If you installed it — respond
py-sys-utils 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 py-sys-utils 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. py-sys-utils on PyPI has been identified as a malicious package (versions 3.0.1, 3.2.4 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2025-04801GENERIC-standard-pypi-install-pentestRLUA-2026-00618

References

bad-packages.kam193.eu

Credits

Kamil Mańkowski (kam193)
ReversingLabs · finder

Detect & block this

O3 blocks py-sys-utils-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

All malware advisories How O3 detects malware Vulnerability database