U2k Ransomware: [.u2k File Virus] Removal.

Unplug USB drives, external hard disks, and SD cards. Step 2: Remove the Malware

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. U2K ransomware [.u2k file virus] removal.

Turn off Wi-Fi or unplug Ethernet cables. Unplug USB drives, external hard disks, and SD cards

To prevent the ransomware from spreading to cloud storage or networked drives: Unplug USB drives

This is the most difficult part. There are two scenarios for STOP/Djvu variants:

Tools like PhotoRec or Recuva can sometimes find "deleted" original versions of files that were swapped for encrypted ones.