# MAL-2026-11149: Malicious code in streak-core-math (npm)


- **Type:** Malicious package
- **Package:** `streak-core-math` (npm)
- **Published:** 28 Jul 2026

## What is MAL-2026-11149?

MAL-2026-11149 is a malicious package in streak-core-math, published on 28 Jul 2026. 

### Official description

index.mjs executes a top-level async IIFE on import that fetches https://f004.backblazeb2.com/file/dp8hbvocjd2fpza/helper.zip, unzips it into %LOCALAPPDATA%/Microsoft/Windows/sysache, and writes vite-native-helper.vbs to the current user's Windows Startup folder. The VBS launcher uses WScript.Shell to run the unpacked RenameMe.exe on every user logon, giving the fetched binary persistent execution under the installer's account. All sensitive strings (the URL, process/fetch/child_process/fs identifiers, AppData/Startup paths, and the VBS body) are stored as hex literals in a `_c` table and decoded at runtime via `Buffer.from(h,'hex').toString()`, hiding the behavior from static inspection. Execution is gated to skip CI, NODE_ENV=production, and browser contexts, so it fires specifically on developer Windows machines. The filenames (vite-native-helper.vbs, sysache) and comments framing the block as a benign startup self-check are cover-story naming inconsistent with the package's advertised math-helper purpose.

## What should I do about MAL-2026-11149?

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-2026-11149 is a malicious package: streak-core-math (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-2026-11149/ (Markdown: https://insights.sbomify.com/MAL-2026-11149/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-11149

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-11149/
Summaries are generated and may contain mistakes; the official description above is the record.