Trojan horse program is currently a relatively popular virus file. Unlike ordinary viruses, it does not reproduce itself, nor does it deliberately infect other files. It pretends to be a normal file to attract users to download and execute. The trojan horse opens the portal of the computer of the users, so that the applicator can destroy and steal the files in the computer of the users at will, and even remotely control their computers.
According to the above definition, the main harm caused by the trojan horse program is stealing user privacy.