Which versions of aioutil3 are malicious?

The following PyPI versions of aioutil3 are flagged malicious: 3.9.1. Treat any of these as compromised.

How do I remediate aioutil3 if I installed it?

aioutil3 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 aioutil3 — how do I know if it already compromised me?

If aioutil3 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 aioutil3 part of a known attack campaign?

Yes — aioutil3 is associated with the 2026-03-aioutil3 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 aioutil3 across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for aioutil3 (version 3.9.1).

Malicious package

aioutil3PyPI

Advisory published Mar 8, 2026Updated Mar 8, 2026

aioutil3 is a confirmed malicious PyPI package (MAL-2026-1289) that steals credentials and exfiltrates sensitive data (malicious version 3.9.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in aioutil3 (PyPI)

MAL-2026-1289

Immediate action

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

pip uninstall aioutil3

What this malware does

This is a malicious clone of legitimate python-utils. The modified code introduces a function that silently exfiltrates given data to a hardcoded location. What is interesting, during the analysis the remote domain did not exist and the malicious code was not called in the package, suggesting preparation for the further attack.

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

Campaign: 2026-03-aioutil3

Reasons (based on the campaign):

clones-real-package
The package contains code to exfiltrate basic data from the system, like IP or username. It has a limited risk.

Malicious versions

1 flagged

3.9.1

Indicators of compromise (SHA-256)

cb06e8bed4bc80c83b203abcee07556086a0c41f2b52d72d4a3b3740ddfa95d0

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for aioutil3 (version 3.9.1).
If you installed it — respond
aioutil3 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 aioutil3 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. aioutil3 on PyPI has been identified as a malicious package (version 3.9.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

2026-03-aioutil3

References

bad-packages.kam193.eu

Credits

Kamil Mańkowski (kam193) · reporter

Detect & block this

O3 blocks aioutil3-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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