What is the most common kind of malware?

There is no definitive response to this concern as the most common type of malware varies depending upon which area of the world you lie in, and likewise changes over time. Some of the most typical types of malware consist of viruses, worms, Trojan horses, and adware.

Viruses are among the oldest and most common kinds of malware. They are programs that are designed to duplicate themselves and infected other computer systems. Worms are similar to viruses, but they are able to spread without requiring to attach themselves to another program. Trojan horses are programs that masquerade as something else, such as a game or a genuine program, however are actually harmful. Adware is a kind of malware that displays marketing on a computer system, typically in a pop-up window.

https://romanquarterconsultation.co.uk/?p=258 Malware is constantly progressing, and new types are continuously being developed. Nevertheless, the types gone over above are some of the most common that you may encounter.