MAL-2026-3356 Malicious code in test-py-conn (PyPI)
Malicious package
Published
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)
- Package
- test-py-conn
- Registry
- PyPI
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.