dynstrg-howtonpm
dynstrg-howto is a confirmed malicious npm package (MAL-2026-12787) that executes malicious code on install (malicious version 1.0.1). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in dynstrg-howto (npm)
What this malware does
package.json declares a preinstall hook that runs index.js on npm install. index.js collects the installer's hostname, username, home directory, DNS server list, and reads /etc/passwd and /etc/hosts, then HTTPS-POSTs the collected JSON to the hardcoded out-of-band endpoint idzskk7dl8mrfoqx6thyhegqbhha50tp.oastify.com (Burp Collaborator subdomain). Execution is automatic on default install; the destination is attacker-controlled and unrelated to any declared package 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 dynstrg-howto (version 1.0.1). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging dynstrg-howto across your stack and pipelines.
If you installed it — respond
Remove dynstrg-howto 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 dynstrg-howto 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 dynstrg-howto 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 dynstrg-howto-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.