MAL-2026-12808 Malicious code in streak-metric-core (npm)

On any require/import of streak-metric-core, top-level code in the main entry reconstructs a URL from String.fromCharCode integer arrays, resolving to https://f004.backblazeb2.com/file/dp8hbvocjd2fpza/service. The package downloads that opaque binary, writes it to ~/.cache/streak-metric/service, chmods it to 0755, and spawns it detached with a randomized delay via spawn(p, [], { detached: true }).unref(). There is no hash or signature verification, the destination is an anonymous Backblaze B2 bucket unrelated to any declared publisher infrastructure, and the URL is reconstructed at runtime specifically to avoid appearing as a plain string. A comment frames the behavior as an 'optional runtime accelerator', but the code executes unconditionally at module load. This grants the package author arbitrary code execution on the installer's host at import time.

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.