Trojan horse are developed by individuals who want to cause harm to others, or who desire to gain control over somebody else's computer. The easiest method to produce a virus is to take some existing code and customize it somewhat. This new code can then be dispersed to others, who may unintentionally run it by themselves computers. As soon as the infection is running, it can do anything its developer wants it to, consisting of erasing files, stealing information, or sending spam. Full Articlesee this More sophisticated viruses can be very challenging to detect and eliminate. https://cleardex.io/?p=1780