TrojanSpy:Win32/Banker is a malicious Trojan horse which is able to come into your PC without your approval. Once inside, it can compromise your system by altering the settings of it. For example, it can make modifications of your DNS settings, then altering your registry configurations. What's more, your program installed will be disabled. As a result, you get a sluggish computer system with little use. You are not able to surf online, or use the programs normally to work.