Ransomware is a type of malicious software that criminals use to attack computer systems.

Hackers often demand the victim to pay ransom money to access their files or remove harmful programs.

The aggressive attacks dupe users into clicking on a fake link – whether it’s in an email or on a fake website, causing an infection to corrupt the computer.

In some instances, adverts for pornographic website will repeatedly appear on your screen, while in others, a pop-up will state that a piece of your data will be destroyed if you don’t pay.

In the case of the NHS attack, the ransomware used was called Wanna Decryptor or ‘WannaCry’ Virus.

The WannaCry virus targets Microsoft’s widely used Windows operating system. The virus encrypts certain files on the computer and then blackmails the user for money in exchange for the access to the files. It leaves the user with only two files: Instructions on what to do next and the Wanna Decryptor program itself.

When opened the software tells users that their files have been encrypted and gives them a few days to pay up or their files will be deleted. It can quickly spread through an entire network of computers in a business or hospital, encrypting files on every PC.

There are ways to avoid ransomware attacks, and Norton Antivirus has compiled a list of prevention methods:

1. Use reputable antivirus software and a firewall

2. Back up your computer often

3. Set up a popup blocker.

4. Be cautious about clicking links inside emails or on suspicious websites.

5. If you do receive a ransom note, disconnect from the Internet.

6. Alert authorities.