What malware looks like a useful or desired executable program but is, in reality, a program that is supposed to cause harm to your computer or steal information from your computer?

Trojan horses

Explanation:

The name is derived from the Trojan horse used by Odysseus to pass some soldiers inside the walls of Troy and win the war. This malware disguises like a normal program, or even like a utility, to trick you into installing it, but when you run the program the destructive or stealing function is activated.