# MAL-2026-15935: Malicious code in proxycer (PyPI)


- **Type:** Malicious package
- **Package:** `proxycer` (PyPI)
- **Published:** 5 Sep 2026

## What is MAL-2026-15935?

MAL-2026-15935 is a malicious package in proxycer, published on 5 Sep 2026. 

### Official description

The package's top-level __init__.py imports starts.py, which is a single-line loader that reverses a ~100KB string literal, base64-decodes it, marshal.loads the result into a code object, and exec()s it. All actual functionality is concealed behind reversal + base64 + marshal bytecode obfuscation, with an empty README and empty PKG-INFO description. The obfuscated code object runs automatically on `import proxycer`, so any behavior it contains (credential access, outbound network, filesystem writes, persistence) executes on the installer's host without source visibility.

The provided functionality hides code that exfiltrates files to a remote location.

---

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

Campaign: 2026-09-asti

Reasons (based on the campaign):

 - files-exfiltration

 - action-hidden-in-lib-usage

 - target:android

## What should I do about MAL-2026-15935?

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-2026-15935 is a malicious package: proxycer (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-2026-15935/ (Markdown: https://insights.sbomify.com/MAL-2026-15935/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-15935

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-15935/
Summaries are generated and may contain mistakes; the official description above is the record.