Trojan.Agent refers to a generic Trojan malware detection. It is used for detections that are either associated with no specific malware families or not enough information is available to pinpoint the malware family.
Trojan.FakeMS is a generic detection for Trojans that try to pose as legitimate Microsoft files.
Malwarebytes protects users from Trojan.FakeMS by using real-time protection.
Malwarebytes can detect and remove Trojan.FakeMS without further user interaction.