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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-19PyPI

Advisory published Updated

atlasctf-21-prod-19 is a confirmed malicious PyPI package (MAL-2025-6456) 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-19 (PyPI)

MAL-2025-6456
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
pip uninstall atlasctf-21-prod-19

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)

0c57b1461379a6288a7a42ab0182c45f5a795d50397cbd54298ca09ae532db8f
95341376a593aedcf1adf0f86e9cb329ba4a81f0c7de1f2796279f56b19fded7
74537e0fdc55a5f9c24996d74d6a582f0bac3c796e4629c46d8803a956647d87
d07145cbc865be26fc5a4fe87c87f68dbb7b161c5993f5037dc3202b132783a8
bdc5af677cbee2b51c792f3460d2fb1d47fb75e161df553bd1b175d92c38ea3f

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for atlasctf-21-prod-19 (2 malicious versions).

  2. If you installed it — respond

    atlasctf-21-prod-19 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-19 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-19 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-2025-035412025-06-atlasctfRLUA-2026-00114

References

Credits

  • Kamil Mańkowski (kam193)
  • ReversingLabs · finder

Detect & block this

O3 blocks atlasctf-21-prod-19-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-19 (PyPI) malicious package — MAL-2025-6456 | O3 Security