# python-dateutil-malicious (PyPI) malicious package — MAL-2025-2992 | O3 Security

Malicious package

# python-dateutil-maliciousPyPI

Advisory published Jul 26, 2024·Updated Mar 19, 2026

python-dateutil-malicious is a confirmed malicious PyPI package (MAL-2025-2992) that steals credentials and exfiltrates sensitive data (malicious version 2.5.4). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in python-dateutil-malicious (PyPI)

MAL-2025-2992

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

pip uninstall python-dateutil-malicious

## What this malware does

Installing the package or importing the module exfiltrates basic information about the host, and the package has no other purpose.

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: GENERIC-standard-pypi-install-pentest

Reasons (based on the campaign):

-   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

1 flagged

2.5.4

## Indicators of compromise (SHA-256)

5ef34d8271e85de3f59ecc76a218287ba3172334c3e0dcbb5401854e9af9155b

1b5dd07344bc2beb16dcbefe636c3e52675ab365aa56abc386982ae4087ac5dc

e746200736f98b51154e3cfbafa826ee92b8badb2005dac0e8fb4765cc3cbc57

7f8dd5658c27181f675637394c5515c28f9e89d7faac160a6a05dbce2eb18edc

be45cc983b1407025eac95ddb9bebfa9a2a2fb3faa41fd9ca2351ec7c52af1c2

## Detection & response playbook

Credential / info stealer

1.  ### Find it
    
    Search your lockfiles and build artifacts for python-dateutil-malicious (version 2.5.4).
    
2.  ### If you installed it — respond
    
    python-dateutil-malicious 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 python-dateutil-malicious 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. python-dateutil-malicious on PyPI has been identified as a malicious package (version 2.5.4 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

## Campaign

RLMA-2025-01991GENERIC-standard-pypi-install-pentestRLUA-2026-00658

## References

-   [bad-packages.kam193.eu](https://bad-packages.kam193.eu/pypi/package/python-dateutil-malicious)

## Credits

-   Kamil Mańkowski (kam193)
-   ReversingLabs · finder

## Detect & block this

O3 blocks python-dateutil-malicious\-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](/malware-detection) [Runtime egress monitoring](/egress-monitor)

## Explore

[All malware advisories](/malware) [How O3 detects malware](/malware-database) [Vulnerability database](/vulnerability)