Which versions of pyowler are malicious?

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

How do I remediate pyowler if I installed it?

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

If pyowler 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 pyowler part of a known attack campaign?

Yes — pyowler is associated with the RLMA-2024-04550 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 pyowler 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 pyowler (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 pyowler across your stack and pipelines.

Malicious package

pyowlerPyPI

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

MAL-2023-8583

Immediate action

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

pip uninstall pyowler

What this malware does

Malicious packages campaign targeting developers, payload is hidden using Steganography, exfiltrate host information

Malicious versions

1 flagged

1.0.0

Indicators of compromise (SHA-256)

9df2ac0489cd9816fc13f309f73773ae3fc26794b44dd4930ab92a367115899f

6cea72329252ba68cd0dac23573fb89e987c8ac82d9293e41031397991af3d46

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 pyowler (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 pyowler across your stack and pipelines.
If you installed it — respond
pyowler 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 pyowler 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 pyowler 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. pyowler 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

RLMA-2024-04550

References

Credits

Checkmarx · finder
ReversingLabs · finder

Detect & block this

O3 blocks pyowler-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