I have Windows NT 4 server with Exchange Server 5.5 with latest service pack 6. I also have Norton Anti Virus Corp. Edition and Norton Anti Virus for Exchange installed.
Recently I found OS2 directory on C: drive with Serv-U FTP serve files. I deleted entire directory and applied latest security patches.
But I could not find much info about Serv-U besides it is a trojan horse. How they managed to get it on server behind a firewall with only port opened is SMTP. And more importan how to prevent it from happening again?
Any one has any expirience dealing with this issue? Any one?
