Which versions of bestcolorsever are malicious?

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

How do I remediate bestcolorsever if I installed it?

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

If bestcolorsever 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 bestcolorsever part of a known attack campaign?

Yes — bestcolorsever is associated with the 2023-12-valuent 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 bestcolorsever across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for bestcolorsever (version 1.0.0).

Part of a larger attack: 2023-12-valuent published 17 malicious packages. See the full campaign →

Malicious package

bestcolorseverPyPI

Advisory published Nov 30, 2024Updated Dec 12, 2025

bestcolorsever is a confirmed malicious PyPI package (MAL-2024-12215) that steals credentials and exfiltrates sensitive data (malicious version 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in bestcolorsever (PyPI)

MAL-2024-12215

Immediate action

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

pip uninstall bestcolorsever

What this malware does

Packages either test the malicious behaviour, or actually download and run a simple remote script during the installation.

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: 2023-12-valuent

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.
Downloads and executes a remote malicious script.

Malicious versions

1 flagged

1.0.0

Indicators of compromise (SHA-256)

5577c45b8c9cc4e03d69b71aac21c2de1101f9ca7a634f541e1af710e1893444

8335ea2981241d7eb1836338e2a942abf4f5096eb264b0ceb13e85ec435b6465

6e4207a598c80a540d8bf0bea97433ce0ab6f4afb2d58178bb56e21c7d5550ef

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for bestcolorsever (version 1.0.0).
If you installed it — respond
bestcolorsever 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 bestcolorsever 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. bestcolorsever 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

2023-12-valuent

References

bad-packages.kam193.eu

Credits

Kamil Mańkowski (kam193)

Detect & block this

O3 blocks bestcolorsever-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