BCA - e-Commerce and Cyber Security

Trojans are malicious programme that allow a hacker to gain remote access to a computer system. They are not self-replicating or automated in the sense that they require contact with a hacker to achieve their goal. 

Trojans must be installed via a compiler or an executable file. Trojans sometimes take advantage of weaknesses in browsers, messaging programed, or media players. The Trojan can be used by the hacker to gain access to sensitive information once it has been deployed.