booking-eligibilitynpm
booking-eligibility is a confirmed malicious npm package (MAL-2026-17316) 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 booking-eligibility (npm)
What this malware does
package.json declares a postinstall lifecycle hook wscript.exe 4444.vbs that runs Windows Script Host against a .vbs file on npm install. The referenced 4444.vbs is not shipped in the tarball, so the hook either fails or (if the file is dropped by another mechanism or provided out-of-band) executes attacker-authored VBScript on the installer's machine at install time. The README explicitly claims 'No installation scripts', directly contradicting the manifest — a cover-story mismatch that misrepresents install-time behavior. The 4444 filename mirrors a well-known reverse-shell port convention. The package presents no legitimate functionality justifying WSH execution at install time.
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 booking-eligibility (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 booking-eligibility across your stack and pipelines.
If you installed it — respond
Remove booking-eligibility 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 booking-eligibility 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 booking-eligibility 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 booking-eligibility-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.