GINA stands for Graphical Identification and Authentication. It is a Windows component (a DLL) that provides the user interface for logging into a Windows system.

Located in msgina.dll (in legacy Windows)

Handles the Ctrl+Alt+Del screen

Collects credentials (username/password) and passes them to the Local Security Authority (LSA)

From CEH v13 Courseware:

Module 6: Malware Threats

Module 4: Windows Authentication Internals

CEH v13 Study Guide states:

“The Graphical Identification and Authentication (GINA) is a DLL that implements the authentication UI for Windows systems. Malicious actors can create custom GINA DLLs to capture login credentials.”