What is the most common type of spyware?

According to a report from cybersecurity company Kaspersky, the most common type of spyware is a trojan called "Trojan-Spy. Win32.Zbot." This trojan is used to steal delicate information from infected computers, consisting of login credentials, financial information, and other individual data. This type of spyware is generally spread through phishing e-mails or infected websites. As soon as set up on a victim's computer, the trojan can be used to remotely control the maker and collect data from it. click for source