Thanks Treches. Excellent and valuable information. You have shed better light on why the same 5 clients of mine keep getting hit while the rest have not.
Molarmite, see his post here:
http://www.ootpdevelopments.com/boar...y-problem.html
For the most part I have you covered as far as the server side. You need to be absolutely sure to clear your machine of the trojan using his instructions. Then, contact me and we'll go forward with new FTP accounts and passwords. Also, if you have any co-commissioners or anyone else with FTP access, they need to scan their machines as well.