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.StolenData is the generic detection for files, folders, and registry entries with user data gathered by other Trojans.
Even though Trojan.StolenData is not malware itself the presence of it on a system indicates that there has been a data theft. Although stolen data is usually stored encrypted on the users’ machines and it is hard to find out what exactly was stolen, you should be aware of the fact that data were stolen, and act on this knowledge. Change your passwords. Use a password manager if you weren’t using one, so it’s no hassle to use a different and complex password for all accounts. Also be aware of spear phishing attempts, and other attempts to defraud you with the stolen data.
Malwarebytes protects users from Trojan.StolenData by using real-time protection to stop the trojans that gather stolen data.
Malwarebytes can detect and remove Trojan.StolenData without further user interaction.