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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-17PyPI

Advisory published Updated

atlasctf-21-prod-17 is a confirmed malicious PyPI package (MAL-2025-6454) 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-17 (PyPI)

MAL-2025-6454
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
pip uninstall atlasctf-21-prod-17

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)

90c58f99ccc7b8615cb1e96a781e0cbdc33e6f4c5523e037bc832f761d6a4b48
3eae432e798f7c860716ba28721595f17299054d826f11f8496cceff8bb39536
0ae7f72936fae89a02869e537528e165a62538cbfdd9d4a441cdcdbd316783da
7d47e622aa06e0bc2ef5089db2a79198942ea66354c853faaa95232f5e0aa390
26b05eabdbda9a90eb2d718e9c667b7786f37d7917e8d8fab53f93bdd703dee5

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for atlasctf-21-prod-17 (2 malicious versions).

  2. If you installed it — respond

    atlasctf-21-prod-17 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-17 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-17 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-2025-035392025-06-atlasctfRLUA-2026-00112

References

Credits

  • Kamil Mańkowski (kam193)
  • ReversingLabs · finder

Detect & block this

O3 blocks atlasctf-21-prod-17-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-17 (PyPI) malicious package — MAL-2025-6454 | O3 Security