permcservernpm
permcserver is a confirmed malicious npm package (MAL-2026-10489) that steals credentials and exfiltrates sensitive data (malicious versions 1.0.0, 1.0.1, 1.0.2…). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in permcserver (npm)
What this malware does
The package's main (index.js) is a 10-line FFI shim that spawns a worker, dlopens the bundled lib-linux.so via koffi, and immediately invokes the native entrypoint vserver_start(). The.so implements a VLESS-over-WebSocket proxy server: it performs the WebSocket handshake using the standard GUID 258EAFA5-E914-47DA-95CA-C5AB0DC85B11, authenticates clients with a hardcoded UUID (4916e0f58abc4ad4ba5d158582c60d85), and services outbound CONNECT %s HTTP/1.1 requests with SOCKS5/HTTP upstream proxy support — turning the installer's host into an attacker-authenticated TCP relay on the moment the package is required. The package exports no library API; starting the proxy listener is the sole effect of importing it. The binary also enumerates hosting-panel port environment variables (PTERODACTYL_PORT, MC_PORT, MINECRAFT_PORT, GAME_PORT) and embeds a decoy :: SYSTEM ONLINE:: / MINECRAFT SERVER HTML page — cover-story content consistent with the package name's implied Pterodactyl/Minecraft server helper purpose, which does not match the actual proxy-backdoor payload. Symbol strings vless_ws.c, relay_thread, and dial_tcp are present in the stripped.so. Requiring or loading this package gives whoever knows the hardcoded UUID persistent, authenticated tunneling access through the installer's machine and the ability to execute arbitrary native code in the Node process.
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
Credential / info stealerFind it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for permcserver (5 malicious versions). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging permcserver across your stack and pipelines.
If you installed it — respond
permcserver is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.
Did it already run?
If permcserver 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 permcserver 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 permcserver-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.