Trojans, like other malware, computer viruses and computer worms, cannot operate on their own. Just as the horse had to be taken in by the Trojans for the Greek plan to work, the harmfulness of Trojan horses depends on the actions of the user. Even if Trojans copy and distribute themselves, each victim must run the program (the Trojan). The harmfulness of Trojan horses therefore depends not on computer system vulnerabilities or settings, but on successful applications of social engineering.But is there no way to protect against them? Of course there are. Anti trojans. Otherwise known as GUARDIANS.