What does the mescouilles malware do?

Importing the module starts an infostealer Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers. Campaign: 2025-11-mescouilles Reasons (based on the campaign): - infostealer - infostealer:kiwi - infostealer:cstealer - exfiltration-generic - exfiltration-browser-data - exfiltration-credentials - files-exfiltration - The package contains code to detect if it is running in a sandbox environment.

Which versions of mescouilles are malicious?

The following PyPI versions of mescouilles are flagged malicious: 0.0.1. Treat any of these as compromised.

How do I remediate mescouilles if I installed it?

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

If mescouilles 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 mescouilles part of a known attack campaign?

Yes — mescouilles is associated with the 2025-11-mescouilles, RLMA-2025-06574, RLUA-2026-00517 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 mescouilles across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for mescouilles (version 0.0.1).

Part of a larger attack: 2025-11-mescouilles published 10 malicious packages. See the full campaign →

Malicious package

mescouillesPyPI

Advisory published Nov 23, 2025Updated Mar 19, 2026

mescouilles is a confirmed malicious PyPI package (MAL-2025-191790) that steals credentials and exfiltrates sensitive data (malicious version 0.0.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in mescouilles (PyPI)

MAL-2025-191790

Immediate action

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

pip uninstall mescouilles

What this malware does

Importing the module starts an infostealer

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

Campaign: 2025-11-mescouilles

Reasons (based on the campaign):

infostealer
infostealer:kiwi
infostealer:cstealer
exfiltration-generic
exfiltration-browser-data
exfiltration-credentials
files-exfiltration
The package contains code to detect if it is running in a sandbox environment.

Malicious versions

1 flagged

0.0.1

Indicators of compromise (SHA-256)

f3d9a3f885eb2e69b72200ef97da75091a5692a2008c135f06013e30df9f0997

c081f74035c370212a2a4d7ab34d10ddc29fdb634e9cedfeeebd407e43b15fae

2e053e7e073ce3e8233e4a2e183f19d1c8100ad1e41d2d8d7590546bfee4f90c

709f59374031b657ecb7723ca326bb7aecb3734f31fedd01c1b1e8ceb8256c61

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for mescouilles (version 0.0.1).
If you installed it — respond
mescouilles 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 mescouilles 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. mescouilles on PyPI has been identified as a malicious package (version 0.0.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

2025-11-mescouillesRLMA-2025-06574RLUA-2026-00517

References

bad-packages.kam193.eu

Credits

Kamil Mańkowski (kam193)
ReversingLabs · finder

Detect & block this

O3 blocks mescouilles-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

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