In recent years, cybercriminals have increasingly turned to specialized tools to enhance the effectiveness of their attacks. One such tool, often distributed through malicious campaigns, is designed to lock users out of their systems while demanding payment for restoration. Screen Lock Builder attacks, commonly categorized as ransomware or screen locker threats, disrupt productivity and extort victims by denying access to critical files or the entire operating system. The tool in question exemplifies this growing trend, leveraging deceptive techniques to bypass security measures and execute its payload with minimal detection.

This software is a type of malicious application that operates as a screen locker, preventing users from accessing their desktops or applications until a ransom is paid. Unlike traditional ransomware, which encrypts files, this tool focuses on restricting system access by overlaying a full-screen window that blocks all other interactions. Cybercriminals typically distribute it through phishing emails, fake software updates, or exploit kits. Once executed, it may display a fabricated warning from law enforcement or a security agency, falsely accusing the victim of illegal activity to pressure them into making a payment.

Key Features of Screen Lock Builder

Feature	Description
Persistent Lock Screen	Displays an uncloseable window that covers the entire screen, preventing access to the system.
Fake Authority Alerts	Mimics legitimate warnings from law enforcement or security agencies to intimidate victims.
Payment Gateway Integration	Includes links or instructions for victims to pay via cryptocurrency or other untraceable methods.
Process Blocking	Terminates or prevents access to critical system processes, such as Task Manager, to hinder removal.
Lightweight Execution	Operates with a minimal system footprint to evade basic security scans.

How Screen Lock Builder Works

Infection and Execution of Screen Lock Builder

The software typically infiltrates systems through social engineering tactics, such as malicious email attachments or disguised software installers.
Once executed, it may employ obfuscation techniques to avoid detection by antivirus programs.
Some variants use process injection to run within trusted system processes, making it harder to terminate.

Screen Lock Mechanism of Screen Lock Builder

Upon activation, the tool launches a full-screen window that remains on top of all other applications.
This window is designed to resist standard closure methods, including disabling keyboard shortcuts (e.g., Alt+F4, Ctrl+Alt+Del) and blocking access to system utilities.
In some cases, it may also disable the mouse or restrict input to only the ransom note interface.