Re: compromised network

["Lard van den Berg" <lard () vandenberg com>]

Dana,
I would externally disconnect your network (of course if this is possible -
not always in age of e-commerce etc.) and build up your network from
scratch. Depending on how many servres you have got it is a rather daunting
task to find out what is infected and what isn't. Re-install OS systems and
look at backups of logsfiles of the compromised ones to see if there any
foodprints. You might want to leave a disinfected server inplace
(disconnected though) for any legal steps you want to take. Installing an
IDS system would be suggested in future.







Regards,
Lard van den Berg

----- Original Message -----
From: "Dana Rawson" <absolutezero273c () nzoomail com>
To: <security-basics () securityfocus com>
Sent: Friday, December 26, 2003 7:21 PM
Subject: compromised network


> Not sure where to start except by saying that my servers and router were
compromised.  Have locked down both servers and routers (at least I have
attempted to do so) but what is the best way to verify that there is nothing
rogue left active on the servers?  Also, is there any legal action I should
take (i.e. Do I alert any authorities)?  It appears that my network was
targeted by a server in california and individuals from Australia,
Netherlands and the US were connecting using it as an ftp server.  Was
actually named "Revenge Server".
> I just installed Ethereal and am currently capturing packets but am not
really sure how to read this or if there is any easier way to monitor all
things. ...And to actually know how to read it.
> Will I be able to retrieve ip addresses from packets to match activity on
my syslog and identify rogue traffic?
> This is all new to me so I apologize if my questions don't make sense or
my approach is illogical.
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