More Malware! Ugh! For this question select a specific type of malware (Trojans Horses, Viruses, Worms, Ransomware) and identify the following

1. What type it is (name the category of malware (see the parenthesis above).
2. How does it infect a computer? How does it get into the computer (most common ways - not an exhaustive list); what does it do once it is there?
3. Are there any well-known examples of this type of malware? Name at least one. Describe the damage done by it (cost of loss or number of systems affected or hack that occurred).
4. What is the best defense against this type of malware? Explain.