Question

Am i being hacked? Event ID 540 and 538 in SBS 2003 plus ISA 2004

Asked by: 05fdml

Our sbs server is on the internet. For protection ISA 2004 is installed and is running. Anonymous access has been disabled in the gpo the anonymous account has been renamed as well, just in case.
However, we keep getting these:

Event Type:      Success Audit
Event Source:      Security
Event Category:      Logon/Logoff
Event ID:      540
Date:            5/8/2007
Time:            9:47:40 PM
User:            NT AUTHORITY\ANONYMOUS LOGON
Computer:      happy
Description:
Successful Network Logon:
       User Name:      
       Domain:            
       Logon ID:            (0x0,0x100B7AB)
       Logon Type:      3
       Logon Process:      NtLmSsp
       Authentication Package:      NTLM
       Workstation Name:      DHWEB1
       Logon GUID:      -
       Caller User Name:      -
       Caller Domain:      -
       Caller Logon ID:      -
       Caller Process ID: -
       Transited Services: -
       Source Network Address:      65.210.203.90
       Source Port:      0



Not a lot and generally from the same ip address: and a few minutes later is the corresponding 538 logout which matches the login ID.

The server is standalone environment (colo server) so there is no lan machines. All IPs are external.

I have searched everywhere and there has been no specific yes or no you are being hacked if you see the above. I think we are, but how do i stop it using ISA 2004?

Please help

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Asked On
2007-05-09 at 08:22:04ID22561737
Tags

event

,

540

,

id

,

538

Topics

MS Forefront-ISA

,

SBS Small Business Server

Participating Experts
3
Points
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Comments
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Answers

 

by: r-kPosted on 2007-05-09 at 09:33:10ID: 19058350

Is 65.210.203.90 your server address, or some computer known to you? It seems to be in the Dallas area.

Event ID 540 is discussed in this link:
 http://www.microsoft.com/technet/prodtechnol/windows2000serv/maintain/monitor/logonoff.mspx

 

by: 05fdmlPosted on 2007-05-09 at 09:35:48ID: 19058360

It is a computer unknown to me

 

by: TechSoEasyPosted on 2007-05-09 at 20:16:13ID: 19062549

Do you have any Windows Mobile devices that sync with your server?  If so, that's what you're seeing.

Jeff
TechSoEasy

 

by: 05fdmlPosted on 2007-05-10 at 07:08:58ID: 19065327

No, there are no mobile devices synching. As I stated above, the computer 9and ip address) is unknown to me.

 

by: TechSoEasyPosted on 2007-05-10 at 09:42:12ID: 19066685

Then do you have any web applications that are open to the Internet?  Because anonymous authentication doesn't get anyone into much of anything... but if you have an ASP web site that is set to allow for anonymous authentication, then it's quite possible that someone is looking at it... but that doesn't mean at all that you are being hacked.

Jeff
TechSoEasy

 

by: 05fdmlPosted on 2007-05-18 at 08:18:22ID: 19116259

I have found the reason. Apparently ISA 2004 had a rule that allowed people some sort of anonymous entrance.

 

by: Computer101Posted on 2008-08-26 at 14:42:37ID: 22319916

PAQed with points refunded (500)

Computer101
EE Admin

20120131-EE-VQP-002

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