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03.02.2003 at 04:40AM PST, ID: 20535343
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7.4

Windows network hacking attack

Asked by apocow in Miscellaneous Security

Tags: ,

I am sysadmin for a Windows NT4.0 server, and I know a related network running a Windows 2000 server that has the same hacking problem.

According to the event logs, some hacker(s) are repeatedly try to log in through the server's domain... the trick is that the hackers or scripts somehow know all of the valid usernames for the domain.   The attacks come every 30 minutes or so, and in each attack, some script is attempting logins using the entire list of usernames in order.  As far as I know, none of these attacks/logins have ever been successful, but they worry me and also tend to slow down the server.
 
I don't think the hackers are sniffing the usernames because some of the usernames they have been trying have not been used in a long time.  In addition, the Windows 2000 server that has been having this problem uses Kerberos encrypted log-ins.  Plus, if they were sniffing usernames, they might as well be sniffing the passwords, too.  The NT server runs an FTP server that is not terribly secure (we're working on replacing the whole thing), but the Windows 2000 server is not running any other services.

If anyone has seen this before, knows a solution, or knows of links where i can find information about such attacks, I would appreciate your help.Start Free Trial
[+][-]03.02.2003 at 08:33AM PST, ID: 8052113

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About this solution

Zone: Miscellaneous Security
Tags: ftp, server
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Solution Provided By: Charlyoz
Participating Experts: 9
Solution Grade: A
 
 
[+][-]03.02.2003 at 03:29PM PST, ID: 8053909

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[+][-]03.03.2003 at 12:22AM PST, ID: 8055788

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[+][-]03.03.2003 at 01:52AM PST, ID: 8056156

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[+][-]03.03.2003 at 05:10AM PST, ID: 8056937

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[+][-]03.03.2003 at 08:47AM PST, ID: 8058337

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[+][-]03.03.2003 at 09:05AM PST, ID: 8058445

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[+][-]03.04.2003 at 07:32AM PST, ID: 8064965

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[+][-]03.04.2003 at 10:44AM PST, ID: 8066369

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