[Dshield] Does ring any bell?

Johannes B. Ullrich jullrich at sans.org
Tue Jan 6 14:58:43 GMT 2004

>    Question: anyone have a clue what this might be? What did
>    the IP address point to at some point?

sorry. no clue. Looks like a Sprint IP address. There is no
FTP server responding right now.

>    Question: if reverse DNS fails, does this imply that forward
>    DNS also failed? Ie. that the IP address is hard-coded in the
>    program?

no. Forward and reverse DNS are separate. Either may work without
the other. 

>    Question: are backdoors typically smart enough to hide from
>    the task list?

Some of them are. All depends on the particular backdoor. Most don't
bother with hiding.

>    Question: if I telnet to his PC on one of these ports, will
>    I see a command-line interface? With help :-)? Or are backdoor
>    interfaces more commonly binary interfaces (ie w GUI clients)?

Connecting with telnet (or netcat) is a good start. You may not
see a 'prompt', but the software may identify itself otherwise.
Or you may find that its an IRC/telnet/ftp server listening on that

> Wrt "netstat -n -a" output, couple of questions.
> When the "local address" is shown as "", does this
> mean that connections are accepted from anywhere? When it shows
> "", does this mean that only local connections are
> accepted? And when it shows a specific IP address, does it mean
> that it accepts connections only from that interface?

Listeners on can only accept connections from the machine
itself. If a listener is "bound to", it indicates that it
is listening on all available interfaces.

If you see it bound to a particular (local) ip address, it will
only accept connections if they are send to this particular ip.

> I will be trying SpyBot S&D for sure on his system.
> Thanks,
> Pierre Lewis
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CTO SANS Internet Storm Center               http://isc.sans.org
phone: (617) 837 2807                          jullrich at sans.org 

contact details: http://johannes.homepc.org/contact.htm
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