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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-03PyPI

Advisory published Updated

atlasctf-21-prod-03 is a confirmed malicious PyPI package (MAL-2025-6440) that steals credentials and exfiltrates sensitive data (malicious versions 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-03 (PyPI)

MAL-2025-6440
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
pip uninstall atlasctf-21-prod-03

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

2 flagged
99.99.9999.99.99.1

Indicators of compromise (SHA-256)

f93a59fd0d977a1b6874633344c4de56029d52ad2128dd62adf6031acb536c52
0faa41ecc59c3b480580d8454b8773c85e9ccbfedf0ce85c715e08b075f135ef
374fe69b5719748c5255c0665469e0e45e3064884ece003a7fbfc56c04d3a93b
94d0ac117b393c6191ece0e535a192d69d5c2de3116dd99b900cb26416946744
e46c572f66f69f53dbc2bb7f96e5ffd5b90a1c6c3b3e98341c3ef68db7db9d77

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for atlasctf-21-prod-03 (2 malicious versions).

  2. If you installed it — respond

    atlasctf-21-prod-03 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-03 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-03 on PyPI has been identified as a malicious package (versions 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-2025-035252025-06-atlasctfRLUA-2026-00098

References

Credits

  • Kamil Mańkowski (kam193)
  • ReversingLabs · finder

Detect & block this

O3 blocks atlasctf-21-prod-03-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
atlasctf-21-prod-03 (PyPI) malicious package — MAL-2025-6440 | O3 Security