streak-core-bucketnpm
streak-core-bucket is a confirmed malicious npm package (MAL-2026-12806) that executes malicious code on install (malicious version 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in streak-core-bucket (npm)
What this malware does
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.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for streak-core-bucket (version 1.0.0). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging streak-core-bucket across your stack and pipelines.
If you installed it — respond
Remove streak-core-bucket from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.
Did it already run?
If streak-core-bucket was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.
How O3 protects you
O3 blocks streak-core-bucket before install through its supply-chain scanner, and if it has already run, detects and severs the exfiltration or C2 callback at runtime through L7 egress monitoring and eBPF.
Frequently asked questions
Campaign
References
Credits
- Amazon Inspector · finder
Detect & block this
O3 blocks streak-core-bucket-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.