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Malicious package

multithreadedexecutionPyPI

Advisory published Updated

multithreadedexecution is a confirmed malicious PyPI package (MAL-2025-191798) 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 multithreadedexecution (PyPI)

MAL-2025-191798
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
pip uninstall multithreadedexecution

What this malware does

Once run, package downloads and installs an infostealer

Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.

Campaign: 2025-11-discord-selfsbotsx

Reasons (based on the campaign):

  • Downloads and executes a remote executable.

  • infostealer

  • malware

  • peristence-autorun

Malicious versions

1 flagged
1.0.0

Indicators of compromise (SHA-256)

5af5a526d3255cf6c76e0490269ba46e56c0944a8f7c761e63ee801f07ffd1d0
3248950b032e1381ddc79d43dfdba8fb6dccce4b1afafd5825e560d793b3bd09

Detection & response playbook

Credential / info stealer
  1. Find it

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

  2. If you installed it — respond

    multithreadedexecution 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 multithreadedexecution 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. multithreadedexecution 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

2025-11-discord-selfsbotsx

References

Credits

  • Kamil Mańkowski (kam193)

Detect & block this

O3 blocks multithreadedexecution-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Explore

multithreadedexecution (PyPI) malicious package — MAL-2025-191798 | O3 Security