upload a trojan to mydoom infected computer

i have an old 486 infected pc connected to other computer and i'm
playing with mydoom.a in order to can upload a file by the backdoor
and execute it. But all the trojans i probe cant be uploaded, i think
by restrictions with the size of the file.

I use necat:

nc -vv -p 3127 192.168.1.2 < file.exe (file is 27Kb)
sent: 8808 recv:0 CONNRESET


so... which trojan can be uploaded to a infected machine? none? or
only one...


thanks in advance.

"Jorge J. P?rez" <jorgejesus.TakeThisOut@terra.es> wrote in message news:2d80a141.0401310721.6895dbed@posting.google.com...
> i have an old 486 infected pc connected to other computer and i'm
> playing with mydoom.a in order to can upload a file by the backdoor
> and execute it. But all the trojans i probe cant be uploaded, i think
> by restrictions with the size of the file.
>
> I use necat:
>
> nc -vv -p 3127 192.168.1.2 < file.exe (file is 27Kb)
> sent: 8808 recv:0 CONNRESET
>
>
> so... which trojan can be uploaded to a infected machine? none? or
> only one...

I'm pretty sure that the backdoor server is needed to facilitate
reciept from the client. You would probably need to craft TCP
packets that the server can recognize as client sent with the EXE
embedded.