# MAL-2026-3356: Malicious code in test-py-conn (PyPI)


- **Type:** Malicious package
- **Package:** `test-py-conn` (PyPI)
- **Published:** 6 May 2026

## What is MAL-2026-3356?

MAL-2026-3356 is a malicious package in test-py-conn, published on 6 May 2026. 

### Official description

The code automatically starts a worker designed to survive the exit of the main process. The worker load code from a PYC file which then connects to pre-defined C2 server and awaits commands to execute.

---

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

Campaign: 2026-05-test-py-conn

Reasons (based on the campaign):

 - The package contains code to execute remote commands (probably limited to a specific set) on the victim's machine.

 - rat

## What should I do about MAL-2026-3356?

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-2026-3356 is a malicious package: test-py-conn (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-2026-3356/ (Markdown: https://insights.sbomify.com/MAL-2026-3356/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-3356

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-3356/
Summaries are generated and may contain mistakes; the official description above is the record.