Trojan:Win32/Agent is a generic detection for a number of trojans that may perform different malicious functions. The behaviors exhibited by this family are highly variable.
Due to the generic nature of this detection, methods of installation may vary. These trojans may often install themselves by copying their executable to the Windows or Windows system folders, and then modifying the registry to run this file at each system start. These trojans often modify the following subkey in order to accomplish this: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
Again, the generic nature of this detection means that the Payloads performed by this group of trojans may be highly variable, and therefore difficult to describe specifically. This group of trojans has been observed to perform any, or all, of the following actions:
redirect Web traffic
manipulate certain Windows or third-party applications including settings or configurations