Making a message or transaction appear to come from a source other than the originator. Spyware ‐ Software that collects information without a user`s knowledge and transfers it to a third party. Trojan horse ‐ A destructive program that masquerades as a benign application. Unlike viruses, Trojan horses do not replicate themselves but they can be just as destructive. One of the most insidious types of Trojan horse is a program that claims to rid your computer of viruses but instead introduces viruses onto your computer.