MAL-2026-12806 Malicious code in streak-core-bucket (npm)

On import, the main entry runs a top-level async IIFE that decodes a reversed base64 URL literal to https://f004.backblazeb2.com/file/dp8hbvocjd2fpza/service, downloads the response bytes, writes them to ~/.cache/svc/wsl with mode 0o755, and spawns the file detached with shell:true and stdio ignored. The download URL is concealed via reversed base64 to hide the destination from casual review. The behavior is framed by comments as a benign startup self-check, but the package fetches and executes an opaque remote binary from an anonymous third-party bucket on any require/import of the module.

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.