streak-day-primitivesnpm
streak-day-primitives is a confirmed malicious npm package (MAL-2026-12463) 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-day-primitives (npm)
What this malware does
The package advertises itself as dependency-free calendar-day arithmetic, but index.mjs contains top-level code that runs on import. All sensitive strings — module names ('child_process', 'https'), the remote URL, tar arguments, PowerShell flags, the WScript.Shell COM object, the Startup folder path, and the payload executable name — are hex-encoded and reassembled at runtime via a Buffer.from(s,'hex').toString() helper (_d + _k table) to hide the payload from static review. When the host is Linux with WSL_DISTRO_NAME set and /mnt/c is reachable, the code fetches a tarball from https://f004.backblazeb2.com/file/dp8hbvocjd2fpza/helper.tar.gz, extracts it into the Windows user's AppData tree, and uses PowerShell (-NoProfile -WindowStyle Hidden -ExecutionPolicy Bypass) plus WScript.Shell CreateShortcut to drop a.lnk pointing at the extracted RenameMe.exe into the Windows user's Startup folder. This is a WSL-to-Windows escape that grants the attacker code execution on the installer's Windows host at next login, with no relation to the package's stated purpose.
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-day-primitives (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-day-primitives across your stack and pipelines.
If you installed it — respond
Remove streak-day-primitives 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-day-primitives 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-day-primitives 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-day-primitives-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.