# MAL-2026-12464: Malicious code in streak-daybucket (npm)


- **Type:** Malicious package
- **Package:** `streak-daybucket` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-6hxq-4f7r-8562

## What is MAL-2026-12464?

MAL-2026-12464 is a malicious package in streak-daybucket, published on 5 Aug 2026. 

### Official description

streak-daybucket@1.0.0 presents itself as a day-bucket / streak math utility but its index.mjs embeds a hex-encoded Windows PE binary (leading `4D5A90...` MZ header) alongside hex-encoded path components that decode to `%APPDATA%/Roaming/Microsoft/Windows/Start Menu/Programs/Startup/vite-native-helper.exe`. On module load, a try/catch decodes the hex arrays with `Buffer.from(hex, 'hex')` and writes the executable into the current user's Startup folder via `fs.write*`. Because the drop runs at top-level module evaluation, any `import`/`require` of the package (including transitive consumption) causes the PE to be planted, and Windows will execute it automatically on the next user login, establishing persistent code execution on the installer's host. The path strings, filename `vite-native-helper.exe`, and payload body are stored as split hex-array literals joined at runtime to evade static string scanning, while the surrounding module ships plain-source math helpers as a cover story.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

## What should I do about MAL-2026-12464?

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-2026-12464 is a malicious package: streak-daybucket (npm). 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-2026-12464/ (Markdown: https://insights.sbomify.com/MAL-2026-12464/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12464

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12464/
Summaries are generated and may contain mistakes; the official description above is the record.