Troj/Agent-GPB is a backdoor Trojan which allows a remote intruder to gain access and control over the computer.
When first run Troj/Agent-GPB copies itself to <System>\<random>.exe.
The following registry entries are created to run the Trojan on startup:
HKCU\Software\Microsoft\Windows\CurrentVersion\Run
<random>
<System>\<random>.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
<random>
<System>\<random>.exe