Trojan

Cyberthreats.

A trojan is computer software designed to breach the security of a system, while ostensibly performing a useful or innocuous function.

'Trojan' is an abbreviation of 'Trojan horse'.

The term originates from the myth in which soldiers attacking Troy hid inside an innocuous wooden horse, that the defenders then pulled through the gates of their own besieged city.

See also

• Cyber security
• Cyberthreat
• Malware
• Ransomware