Answer:
This kind of malware attack is known as ransomware.
Explanation:
-Ransomware is a type of malicious software that typically involves encrypting the files of a victim's PC, laptop or systems. The hacker(s) This essentially denies the victim any access to their data.They then demands payment in order to allow the victim access to their own data. The payment is always required to be transferred in crypto-currency to the hackers.
-Examples of ransomware includes Reveton, CryptoLocker, CryptoWall and the infamous Wannacry which attacked many victims PC across the globe in 2017. Ransomware attacks can be initiated by a user unknowingly visits an infected website.The malware then self downloads and installs itself onto the user’s PC without their knowledge.
-Ransomware attacks can be prevented by using advanced antivirus.