Nosferatu is a Lsass NTLM Authentication Backdoor
How It Works
First, the DLL is injected into the lsass.exe process, and will begin hooking authentication WinAPI calls. The targeted function is MsvpPasswordValidate(), located in NtlmShared.dll. In the pursuit of not being detected, the hooked function will call the original function and allow for the normal flow of authentication. Only after seeing that authentication has failed will the hook swap out the actual NTLM hash with the backdoor hash for comparison.
Nosferatu must be compiled as a 64 bit DLL. It must be injected using the a DLL Injector with SeDebugPrivilege.
You can see it loaded using Procexp:
Login example using Impacket:
Imagine if you had a super-powered assistant who could automatically handle all the boring, repetitive…
Managing files efficiently is a core skill for anyone working in Linux, whether you're a…
Open ports act as communication endpoints between your Linux system and the outside world. Every…
Introduction In today’s cyber threat landscape, protecting endpoints such as computers, smartphones, and tablets from…
Introduction In today's fast-paced cybersecurity landscape, incident response is critical to protecting businesses from cyberattacks.…
Artificial Intelligence (AI) is changing how industries operate, automating processes, and driving new innovations. However,…