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.
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.