MAL-2026-933 Malicious code in pywin-simple-gui (PyPI)
Malicious package
Published
MAL-2026-933 is a malicious package: pywin-simple-gui (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-2026-933/ (Markdown: https://insights.sbomify.com/MAL-2026-933/index.md)
- Package
- pywin-simple-gui
- Registry
- PyPI
What is MAL-2026-933?
MAL-2026-933 is a malicious package in pywin-simple-gui, published on 17 Feb 2026.
Official description
The package pretends to be a development helper but, in fact, downloads a remote executable. Dynamic analysis reveals actions like disabling Windows Defender and interest in cryptocurrencies as well as using Telegram as C2.
Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.
Campaign: 2026-02-pywin-simple-gui
Reasons (based on the campaign):
impersonation
Downloads and executes a remote executable.
modify-system-without-consent
crypto-related
What should I do about MAL-2026-933?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.