Which versions of pyenvprep are malicious?

The following PyPI versions of pyenvprep are flagged malicious: 1.0.0. Treat any of these as compromised.

How do I remediate pyenvprep if I installed it?

pyenvprep 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 pyenvprep — how do I know if it already compromised me?

If pyenvprep was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.

Is pyenvprep part of a known attack campaign?

Yes — pyenvprep is associated with the 2026-05-venv-utils 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 pyenvprep across my projects, lockfiles, and CI pipelines?

Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for pyenvprep (version 1.0.0). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging pyenvprep across your stack and pipelines.

Malicious package

pyenvprepPyPI

Malicious code in pyenvprep (PyPI) Remove it immediately and rotate any exposed credentials.

MAL-2026-3829

Immediate action

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

pip uninstall pyenvprep

What this malware does

Package contains code to silently execute a RAT-like agent, allowing the attacker to access the file system and execute arbitrary code.

Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.

Campaign: 2026-05-venv-utils

Reasons (based on the campaign):

rat
typosquatting
The package contains code to execute remote commands (probably limited to a specific set) on the victim's machine.
obfuscation

Malicious versions

1 flagged

1.0.0

Indicators of compromise (SHA-256)

963727b60e7fa8536050eb0f4691dc8bec6089567630063305d05ddceb4834cd

Detection & response playbook

Credential / info stealer

Find it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for pyenvprep (version 1.0.0). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging pyenvprep across your stack and pipelines.
If you installed it — respond
pyenvprep 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 pyenvprep was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.
How O3 protects you
O3 blocks pyenvprep before install through its supply-chain scanner, and if it has already run, detects and severs the exfiltration or C2 callback at runtime through L7 egress monitoring and eBPF.

Frequently asked questions

No. pyenvprep on PyPI 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

2026-05-venv-utils

References

bad-packages.kam193.eu

Credits

Kamil Mańkowski (kam193) · reporter

Detect & block this

O3 blocks pyenvprep-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