# MAL-2025-191729: Malicious code in flashsimplelogger (PyPI)


- **Type:** Malicious package
- **Package:** `flashsimplelogger` (PyPI)
- **Published:** 5 Aug 2025

## What is MAL-2025-191729?

MAL-2025-191729 is a malicious package in flashsimplelogger, published on 5 Aug 2025. 

### Official description

It's a clone of "loguru" package which on import loads a second-stage script from loguru[.]guru. This makes a few checks and downloads the next stage, which is a code obfuscated with PyArmor with unclear behaviour.

The way the malicious code has been embedded could be called a "sophisticated" threat. The code is in the _logger.py in two places: the payload in L2242 as a long string constraint of only whitespaces, which are then transformed into bits and bytes, and later compiled and executed using "types.FunctionType" during initialisation of Core class.

---

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

Campaign: 2025-07-loquru

Reasons (based on the campaign):

 - typosquatting

 - obfuscation

 - clones-real-package

 - Downloads and executes a remote malicious script.

## What should I do about MAL-2025-191729?

Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.

## Fix prompt for AI coding agents

```text
MAL-2025-191729 is a malicious package: flashsimplelogger (PyPI). Every version was published to cause harm.

Task:
1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.
2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.
3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.
4. If the package is not used anywhere, say so and change nothing.

Reference: https://insights.sbomify.com/MAL-2025-191729/ (Markdown: https://insights.sbomify.com/MAL-2025-191729/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2025-191729

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From sbomify Insights: https://insights.sbomify.com/MAL-2025-191729/
Summaries are generated and may contain mistakes; the official description above is the record.