How Cyber Threats Like Trojans Affect Everyday Internet UsersFor years, cyberattacks felt distant. So, what is a Trojan virus? How Everyday Online Habits Lead to Trojan InfectionsNo dramatic hack accompanies a Trojan virus. Learning to detect Trojan virus activity early on helps users recognize when routine actions become real risks. Another red flag that helps to detect a Trojan virus is unexpected network activity.