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.Qhost is the generic detection for malware that modifies the Windows system’s hosts file.
Trojan.Qhost alters the hosts file as a means to redirect the users internet traffic, for example to stop him from downloadinf security software or installing updates.
Malwarebytes protects users from Trojan.Qhost by using real-time protection.
Malwarebytes can detect and remove Trojan.Qhost without further user interaction.
If you were using a custom hosts file before infection, you may have to re-create it or restore from your backup.