# MAL-2026-12459: Malicious code in streak-core-insights (npm)


- **Type:** Malicious package
- **Package:** `streak-core-insights` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-v7qq-2qm4-hcjx

## What is MAL-2026-12459?

MAL-2026-12459 is a malicious package in streak-core-insights, published on 5 Aug 2026. 

### Official description

The package advertises calendar-day math but on module import runs an obfuscated initializer that gates on Linux + WSL_DISTRO_NAME, then downloads helper.tar.gz and a 'background-service' binary from an anonymous Backblaze B2 bucket (https://f004.backblazeb2.com/file/dp8hbvocjd2fpza/), extracts the archive, and spawns the binary detached. The initializer then enumerates /mnt/c/Users to locate a Windows profile and writes an env-setup.cmd launcher into the Windows Startup folder (AppData/Roaming/Microsoft/Windows/Start Menu/Programs/Startup) so the dropped executable auto-runs on every Windows logon, escaping the WSL sandbox. All identifiers, URLs, filesystem paths, and the.cmd template are stored as String.fromCharCode numeric arrays to defeat static inspection. The fetched binaries are unpinned, unverified, and unrelated to the stated purpose.

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-2026-12459?

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-2026-12459 is a malicious package: streak-core-insights (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-2026-12459/ (Markdown: https://insights.sbomify.com/MAL-2026-12459/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12459

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12459/
Summaries are generated and may contain mistakes; the official description above is the record.