>Do you have any idea of what approach they would have used to break thru the firewall?
>
>More and more, companies are installing those firewall boxes and it's kind of scary to hear something like that.

Actually, it's my own fault, I just didn't want to post it that way! I turned the firewall off temporarily to make some adjustments and forgot to turn it back on right away. As soon as I did I found the suspicious files.