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Part of a larger attack: 2025-06-atlasctf published 23 malicious packages. See the full campaign →
Malicious package

atlasctf-21-prod-01PyPI

Advisory published Updated

atlasctf-21-prod-01 is a confirmed malicious PyPI package (MAL-2025-6438) that steals credentials and exfiltrates sensitive data (malicious versions 0.0.10, 99.99.99, 99.99.99.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in atlasctf-21-prod-01 (PyPI)

MAL-2025-6438
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
pip uninstall atlasctf-21-prod-01

What this malware does

On installation or importing, the package attempts to exfiltrate some basic information, e.g. /etc/passwd

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: 2025-06-atlasctf

Reasons (based on the campaign):

  • exfiltration-generic

  • 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.

Malicious versions

3 flagged
0.0.1099.99.9999.99.99.1

Indicators of compromise (SHA-256)

7610265b167e510b8ff31a10542797ab57f6af6153353dc8e8c04de48f157f68
a5f1be7e611eea05843d4c0500d16e3ba21a6bab838abff2c4a2881050e9f595
258b21be0ec08a121a4b506eb1cc9409d08b0cfecc9a2b995181dee57254afc7
d50fc830df5b65081a81873ee547b5eea208969210ec12d843e531f21ad17e4c
244eb9843d1a88bce3dd0a335a29efa634335acd02dbeed27e556e838b2464f0

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for atlasctf-21-prod-01 (3 malicious versions).

  2. If you installed it — respond

    atlasctf-21-prod-01 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.

  3. Did it already run?

    If atlasctf-21-prod-01 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. atlasctf-21-prod-01 on PyPI has been identified as a malicious package (versions 0.0.10, 99.99.99, 99.99.99.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2025-035232025-06-atlasctfRLUA-2026-00096

References

Credits

  • Kamil Mańkowski (kam193)
  • ReversingLabs · finder

Detect & block this

O3 blocks atlasctf-21-prod-01-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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atlasctf-21-prod-01 (PyPI) malicious package — MAL-2025-6438 | O3 Security