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.Dridex is a banking Trojan spyware, which means that it is capable of stealing information. Specifically, a list of installed applications and the version of OS it uses, which are information about the affected system. This Trojan also steals banking credentials.
Trojan.Dridex arrives on systems as email attachments. Some variants arrive as exploit downloads.
Malwarebytes can remove Trojan.Dridex without further user interaction.
Users are advised to change passwords of online banking accounts once found their systems are affected by Trojan.Dridex.