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:
The xargs command in Linux reads items from standard input and passes them as arguments to another…
The locate command in Linux searches for files and directories by name. It queries a pre-built database…
Most modern Linux distributions use systemd as the default service manager. Knowing how to list…
Truncating a file in Linux means removing its contents while leaving the file itself in…
The ss command in Linux lists open sockets and active network connections. It replaced the deprecated netstat command and…
The ftp command in Linux connects to a remote FTP server and transfers files. FTP transmits everything…