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Exchange server is spamming using a compromised user profile, but I can't find the profile to disable it.

Posted on 2010-11-17
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Last Modified: 2012-05-10
I have thousands of messages in my outbound, but I cannot find the account that it is using. My event log has an authentication event for a user that I can not find in the directory. How can I find this user to delete it?


Event Type:	Information
Event Source:	MSExchangeTransport
Event Category:	Authentication 
Event ID:	1708
Date:		11/17/2010
Time:		8:20:54 AM
User:		N/A
Computer:	NTSERVER03
Description:
SMTP Authentication was performed successfully with client "User".  The authentication method was "LOGIN" and the username was "DAYTON_ROGERS\Mike".

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

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Question by:leviatdr
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11 Comments
 
LVL 31

Expert Comment

by:Justin Owens
ID: 34155235
Does DAYTON_ROGERS\Mike exist in your AD?
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Author Comment

by:leviatdr
ID: 34155261
No. I can't find it. I've done dsqueries with *mike* and nothing comes back as just mike.
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LVL 31

Expert Comment

by:Justin Owens
ID: 34155351
Exchange 2003? Do you have relay turned on?  If the account doesn't exist in AD and has no mailbox attached to it AND if your SMTP service required Authentication, you should not be getting this event.
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Author Comment

by:leviatdr
ID: 34155452
I have relay turned off, except for a few ip's inside the network. In the SMTP virtual server, I have a ton of sessions open for "User" from ip address 41.134.49.202. I think that's my spammer, but I can't find the account they're using. I have other events in the Log:
Event Type:	Information
Event Source:	MSExchangeTransport
Event Category:	Authentication 
Event ID:	1707
Date:		11/17/2010
Time:		8:41:29 AM
User:		N/A
Computer:	NTSERVER03
Description:
An internal EXPS function failed while communicating with "unknown".  "CExchAuthContext::HrServerNegotiateClearTextAuth" called "HrCheckClearTextLogin" which failed with error code 0x80070533 ( f:\tisp2\transmt\src\smtpsink\exps\expslib\authctx.cpp@803 ).

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 33 05 07 80               3..¿

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Event Type:	Error
Event Source:	Userenv
Event Category:	None
Event ID:	1058
Date:		11/17/2010
Time:		8:51:38 AM
User:		NT AUTHORITY\SYSTEM
Computer:	NTSERVER03
Description:
Windows cannot access the file gpt.ini for GPO CN={31B2F340-016D-11D2-945F-00C04FB984F9},CN=Policies,CN=System,DC=DAYTON_ROGERS,DC=LOCAL. The file must be present at the location <\\DAYTON_ROGERS.LOCAL\sysvol\DAYTON_ROGERS.LOCAL\Policies\{31B2F340-016D-11D2-945F-00C04FB984F9}\gpt.ini>. (Configuration information could not be read from the domain controller, either because the machine is unavailable, or access has been denied. ). Group Policy processing aborted. 

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

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Event Type:	Warning
Event Source:	MSExchangeTransport
Event Category:	Authentication 
Event ID:	1706
Date:		11/17/2010
Time:		8:41:29 AM
User:		N/A
Computer:	NTSERVER03
Description:
EXPS is temporarily unable to provide protocol security with "User".  "CSessionContext::OnEXPSInNegotiate" called "HrServerNegotiateAuth" which failed with error code 0x80070533 ( f:\tisp2\transmt\src\smtpsink\exps\expslib\context.cpp@1799 ).

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 33 05 07 80               3..¿

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LVL 31

Expert Comment

by:Justin Owens
ID: 34155499
That appears to be an external address coming in from outside.  Do you intentionally allow that hole in your firewall?
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Author Comment

by:leviatdr
ID: 34155627
We have a public email server, so I have SMTP, ActiveSync, and IMAP open.
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LVL 31

Expert Comment

by:Justin Owens
ID: 34155797
You will run into a lot of issues with public email servers.  First, I would make sure you harden it.  For specifics on how to do that, I need to know what version of Exchange you are using.
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Author Comment

by:leviatdr
ID: 34155812
Windows Server 2003, Exchange 2003
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LVL 31

Accepted Solution

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Justin Owens earned 500 total points
ID: 34155865
leviatdr,

This is a four part series on all the steps you need to take to harden your server:

http://www.msexchange.org/tutorials/Hardening-Exchange-Server-2003-Environment-Part1.html

I would suggest reading all four parts before starting anything.  If you have any questions about the whats, hows, or whys, ask them first before you start.

Justin
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Author Comment

by:leviatdr
ID: 34158699
I just ran a fgdump from my server and the mystery Mike account showed up as an object in the file. Besides a "dsquery users" how else can I find this account in the directory?
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Author Closing Comment

by:leviatdr
ID: 34159343
I found the Mike account. It's user logon name differed from it's pre-Windows 2000 name, so I missed it. Thanks for all the help.
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