tries to extort money by blackmailing you with a claim that a crime was committed using your PC. It uses a lock screen to stop you from accessing your files or documents. It then tells you to pay a fine to get control of your PC back. It also stops you from viewing the web page source code and from selecting or copying text.
The language of the lock screen message and the payment options can vary depending on your location.
The images below are some examples of the messages shown by Ransom:JS/Krypterade.A:
Analysis by Vincent Tiu