Turn off Wi-Fi or unplug Ethernet cables.
This is the most difficult part. There are two scenarios for STOP/Djvu variants: U2K ransomware [.u2k file virus] removal.
Use reputable tools like Malwarebytes, Emsisoft, or Windows Defender. These programs are effective at identifying and deleting the core STOP/Djvu registry keys and executable files. Turn off Wi-Fi or unplug Ethernet cables
This may bring back system files, though it rarely recovers personal data. Prevention open the hosts file with Notepad
Ransomware often modifies this file to block access to security websites. Navigate to C:\Windows\System32\drivers\etc , open the hosts file with Notepad, and delete any suspicious lines below 127.0.0.1 localhost . Step 3: Decrypting .u2k Files