How are trojan horse created?

Virus are developed by individuals who wish to trigger harm to others, or who wish to gain control over somebody else's computer.  more info here The simplest way to produce an infection is to take some existing code and customize it a little. This brand-new code can then be dispersed to others, who may unsuspectingly run it on their own computers. As soon as the virus is running, it can do anything its creator wants it to, consisting of erasing files, stealing information, or sending spam. More advanced viruses can be really challenging to identify and eliminate.