streak-core-mathnpm
streak-core-math is a confirmed malicious npm package (MAL-2026-11149) 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-math (npm)
What this malware does
index.mjs executes a top-level async IIFE on import that fetches https://f004.backblazeb2.com/file/dp8hbvocjd2fpza/helper.zip, unzips it into %LOCALAPPDATA%/Microsoft/Windows/sysache, and writes vite-native-helper.vbs to the current user's Windows Startup folder. The VBS launcher uses WScript.Shell to run the unpacked RenameMe.exe on every user logon, giving the fetched binary persistent execution under the installer's account. All sensitive strings (the URL, process/fetch/child_process/fs identifiers, AppData/Startup paths, and the VBS body) are stored as hex literals in a _c table and decoded at runtime via Buffer.from(h,'hex').toString(), hiding the behavior from static inspection. Execution is gated to skip CI, NODE_ENV=production, and browser contexts, so it fires specifically on developer Windows machines. The filenames (vite-native-helper.vbs, sysache) and comments framing the block as a benign startup self-check are cover-story naming inconsistent with the package's advertised math-helper purpose.
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-math (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-math across your stack and pipelines.
If you installed it — respond
Remove streak-core-math 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-math 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-math 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-math-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.