Troj/Migmaf-A is a backdoor Trojan which allows unauthorised remote access to the computer over a network.
The Trojan adds an entry to the registry at:
HKCU\Software\Microsoft\Windows\CurrentVersion\Run
to run itself on system restart.
Troj/Migmaf-A may act as reverse proxy web server on the victim's computer. This would allow a remote user to host undesirable websites via the victim's computer without being traced and shutdown.