Audit Alert Scenarios: System Center Operations Manager (OpsMgr) 2007 R2

發行項
11/09/2009

The other day I was asked to assist with implementing the scenarios below:

Scenario 1: Alert for changes to the ‘Domain Admin’ group membership
Scenario 2: Alert when the Audit Policy is changed (Default Domain or Domain Controller)
Scenario 3: Alert when xx number of unsuccessful logons occur within nn hours
Scenario 4: Account locked out x number of times in a 24 hour period

I’ve decided to blog about it as I am likely to need it again in the future and it may help someone else as well!

Scenario 1: Alert for changes to the ‘Domain Admin’ group membership

Prerequisites

OpsMgr agent installed on domain controllers (more info...)
Notification Channel, Subscriber & Subscription configured (more info...)
Enable ‘Audit Account Management’ for the ‘Default Domain Controllers Policy’ (more info... and how to)

Step-by-Step

Create an ‘Alert Generating Rule’ as below:
(more info... and how to)

Note: Rules are used here instead of monitors as monitors will affect Parent Monitors while rules will not.

<table>
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<col style="width: 50%" />
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<td><p>Operations Console &gt; Authoring &gt; Rules &gt; Create a new rule</p>
<p><strong>Note</strong></p>
<p>Create a new destination management pack if required.</p>
<p>Next</p></td>
<td><p><a href="https://msdntnarchive.z22.web.core.windows.net/media/TNBlogsFS/BlogFileStorage/blogs_technet/nzdse/WindowsLiveWriter/AuditAlertScenariosSystemCenterOperation_F6F4/image_6.png"><img src="https://msdntnarchive.z22.web.core.windows.net/media/TNBlogsFS/BlogFileStorage/blogs_technet/nzdse/WindowsLiveWriter/AuditAlertScenariosSystemCenterOperation_F6F4/image_thumb_2.png" title="image" alt="image" width="544" height="484" /></a></p></td>
</tr>
<tr class="even">
<td>Select &gt; ‘Windows Domain Controller’ <strong>Note</strong> Un-tick the ‘Rule is enabled’ checkbox.  Next</td>
<td><p><a href="https://msdntnarchive.z22.web.core.windows.net/media/TNBlogsFS/BlogFileStorage/blogs_technet/nzdse/WindowsLiveWriter/AuditAlertScenariosSystemCenterOperation_F6F4/image_8.png"><img src="https://msdntnarchive.z22.web.core.windows.net/media/TNBlogsFS/BlogFileStorage/blogs_technet/nzdse/WindowsLiveWriter/AuditAlertScenariosSystemCenterOperation_F6F4/image_thumb_3.png" title="image" alt="image" width="547" height="484" /></a></p></td>
</tr>
<tr class="odd">
<td>Select Security as the log name. Next</td>
<td><p><a href="https://msdntnarchive.z22.web.core.windows.net/media/TNBlogsFS/BlogFileStorage/blogs_technet/nzdse/WindowsLiveWriter/AuditAlertScenariosSystemCenterOperation_F6F4/image_10.png"><img src="https://msdntnarchive.z22.web.core.windows.net/media/TNBlogsFS/BlogFileStorage/blogs_technet/nzdse/WindowsLiveWriter/AuditAlertScenariosSystemCenterOperation_F6F4/image_thumb_4.png" title="image" alt="image" width="545" height="484" /></a></p></td>
</tr>
<tr class="even">
<td><p>Configure the event expression as depicted in the image.</p>
<p>Next</p>
<p> </p></td>
<td><p>We will use the following event id’s in this section:</p>
<p>632 – A member was added to a global group.</p>
<p>633 – A member was removed from a global group.</p>
<a href="https://msdntnarchive.z22.web.core.windows.net/media/TNBlogsFS/BlogFileStorage/blogs_technet/nzdse/WindowsLiveWriter/AuditAlertScenariosSystemCenterOperation_F6F4/image_2.png"><img src="https://msdntnarchive.z22.web.core.windows.net/media/TNBlogsFS/BlogFileStorage/blogs_technet/nzdse/WindowsLiveWriter/AuditAlertScenariosSystemCenterOperation_F6F4/image_thumb.png" title="image" alt="image" width="547" height="484" /></a>
<p><strong>Note there are two ways to do this:</strong></p>
<ol>
<li>Use Parameter 3 in screenshot above (more info <a href="https://support.microsoft.com/kb/299475/en-us">here</a> and <a href="https://support.microsoft.com/kb/301677/en-us">here</a>) or;</li>
<li>‘Use parameter name not specified above’ and ‘EventDescription’.</li>
</ol>
<p>Method 1 is preferred.</p></td>
</tr>
<tr class="odd">
<td>Change the severity and priority settings as required. Create</td>
<td><a href="https://msdntnarchive.z22.web.core.windows.net/media/TNBlogsFS/BlogFileStorage/blogs_technet/nzdse/WindowsLiveWriter/AuditAlertScenariosSystemCenterOperation_F6F4/image_4.png"><img src="https://msdntnarchive.z22.web.core.windows.net/media/TNBlogsFS/BlogFileStorage/blogs_technet/nzdse/WindowsLiveWriter/AuditAlertScenariosSystemCenterOperation_F6F4/image_thumb_1.png" title="image" alt="image" width="544" height="484" /></a></td>
</tr>
<tr class="even">
<td> </td>
<td><p><strong>Next steps:</strong></p>
<ol>
<li>Enable newly created rule for ‘all objects of class: Windows Domain Controller’ by using an override. (<a href="https://technet.microsoft.com/en-us/library/bb309719.aspx">more info...</a>)</li>
<li>Create a notification subscription for the rule. (<a href="https://technet.microsoft.com/en-us/library/dd440890.aspx">more info...</a>)</li>
</ol></td>
</tr>
</tbody>
</table>

Alert example

Scenario 2: Alert when the Audit Policy is changed (Default Domain or Domain Controller)

Prerequisites

OpsMgr agent installed on domain controllers (more info...)
Notification Channel, Subscriber & Subscription configured (more info...)
Enable ‘Audit Policy Change’ for ‘Default Domain Policy’ (more info... and how to)

Step-by-Step

Create an ‘Alert Generating Rule’ as below:
(more info... and how to)

Operations Console > Authoring > Rules > Create a new rule Note Create a new destination management pack if required. Next
Select > ‘Windows Domain Controller’ Note Un-tick the ‘Rule is enabled’ checkbox. Next
Select Security as the log name. Next
Configure the event expression as depicted in the image. Next	We will use the following event id in this section: 612 – An audit policy was changed.
Change the severity and priority settings as required. Create
	Next steps: Enable newly created rule for ‘all objects of class: Windows Domain Controller’ by using an override. (more info...) Create a notification subscription for the rule. (more info...)

Alert example

Scenario 3: Alert when xx number of unsuccessful logons occur within nn hours

Disclaimer: This is a complex scenario and I am not sure that my proposed solution is the simplest...it works though! :-)

The following is relatively easy to do though:

· Create an alert for each Unsuccessful Logon.

· Create an alert for each Unsuccessful Logon for a specific user.

· Create one suppressed alert (i.e. repeat count is increased) for all Unsuccessful Logons.

· Create one suppressed alert per user account that attempted an unsuccessful logon. Add 1 to the ‘RepeatCount’ for each subsequent occurrence in a 24 hour period. Create a rule to auto-resolve all related active alerts. Create a rule to send hourly notifications when the ‘RepeatCount’ exceeds xx. I documented only this scenario below.

Prerequisites

OpsMgr agent installed on domain controllers (more info...)
Notification Channel, Subscriber & Subscription configured (more info...) – not strictly speaking necessary for the proposed solution.
Enable ‘Audit Account Logon Events’ for ‘Default Domain Controller Policy’ (more info... and how to)

Step-By-Step

(Create one suppressed alert per user account that attempted an unsuccessful logon. Add 1 to the ‘RepeatCount’ for each subsequent occurrence in a 24 hour period. Create a rule to auto-resolve all related active alerts. Create a rule to send hourly notifications when the ‘RepeatCount’ exceeds xx.)

Create an ‘Alert Generating Rule’ as below:
(more info... and how to)

Operations Console > Authoring > Rules > Create a new rule Note Create a new destination management pack if required. Next
Select > ‘Windows Domain Controller’ Note Un-tick the ‘Rule is enabled’ checkbox. Next
Select Security as the log name. Next
Configure the event expression as depicted in the image. Next	We will use the following event id in this section: 675 - Preauthentication failed. This event is generated on a Key Distribution Center (KDC) when a user types in an incorrect password.
Change the severity and priority settings as required. Alert Suppression
Configure the alert suppression fields as depicted in the image. Ok
Create
	Next steps: Enable newly created rule for ‘all objects of class: Windows Domain Controller’ by using an override. (more info...)

Alert example

Create a rule to resolve all unsuccessful logon alerts on a daily basis

Operations Console > Authoring > Rules > Create a new rule Note Create a new destination management pack if required. Next
Select > ‘Root Management Server’ as the rule target. Note Un-tick the ‘Rule is enabled’ checkbox. Next
Define the schedule as required.
Create a directory on the root management server i.e. c:\scripts > Save the following powershell script in the directory. Note Change the script as required i.e. path to OpsMgr startup.ps1 and rule name.	# ResolveUL.ps1 # Author: Johan Vosloo # Date: 29-10-2009 # Note: The name i.e. "Custom Rule - Count Unsuccessful Logons" below must match the rule name that is used to create the surpressed alert. # Script requires Microsoft.EnterpriseManagement.OperationsManager.ClientShell.Startup.ps1 to be in "c:\Program Files\System Center Operations Manager 2007" - Change as required. add-pssnapin "Microsoft.EnterpriseManagement.OperationsManager.Client"; Set-Location "c:\Program Files\System Center Operations Manager 2007"; .\Microsoft.EnterpriseManagement.OperationsManager.ClientShell.Startup.ps1; get-alert \| where {($_.Name -eq "Custom Rule - Count Unsuccessful Logons") -and ($_.ResolutionState -eq "0")} \| resolve-alert -comment "CLOSE daily informational alerts" \| out-Null;
Configure command line execution settings as depicted in the image. Create
	Next steps: Enable newly created rule for ‘all objects of class: Root Management Server’ by using an override. (more info...)

Create a rule to send notification when alert ‘RepeatCount’ equal xx within nn hours

Operations Console > Authoring > Rules > Create a new rule Note Create a new destination management pack if required. Next
Select > ‘Root Management Server’ as the rule target. Note Un-tick the ‘Rule is enabled’ checkbox. Next
Define the schedule as required.
Create a directory on the root management server i.e. c:\scripts > Save the following powershell script in the directory. Note Change the script as required i.e. path to OpsMgr startup.ps1 and rule name.	# NotifyULogon.ps1 # Author: Johan Vosloo # Date: 29-10-2009 # Credit: Adapted from https://contoso.se/blog/?p=290 # Script requires Microsoft.EnterpriseManagement.OperationsManager.ClientShell.Startup.ps1 to be in "c:\Program Files\System Center Operations Manager 2007" - Change as required.# Change the Notification Recipient below.$Recipient = security@paris.com;add-pssnapin "Microsoft.EnterpriseManagement.OperationsManager.Client";Set-Location "c:\Program Files\System Center Operations Manager 2007";.\Microsoft.EnterpriseManagement.OperationsManager.ClientShell.Startup.ps1;# The name i.e. "Custom Rule - Count Unsuccessful Logons" below must match the rule name that is used to create the surpressed alert.$alertdata = get-alert \| where {($_.Name -eq "Custom Rule - Count Unsuccessful Logons") -and ($_.ResolutionState -eq "0") -and ($_.RepeatCount -gt "3") -and ($_.CustomField1 -lt 0)} \| Foreach { $_.Id; $alert_id = $_.Id; $alert_name = $_.Name; $alert_TimeRaised = $_.TimeRaised; $alert_Desc = $_.Description; $alert_RepeatCount = $_.RepeatCount; $alert_Severity = $_.Severity; $alert_priority = $_.Priority; $alert_MonitoringObjectDisplayName = $_.MonitoringObjectDisplayName; If ($alert_RepeatCount -gt 3) { # Send Email If ($alert_ID -eq $NULL) {"Alert ID is NULL, dont send e-mail";} ELSEIF ($recipient -eq $NULL) {"Recipient is NULL, dont send e-mail";} ELSE { # Change the from address and the mailserver below $smtpServer = "mailserver.paris.com"; $smtpClient = new-object system.net.mail.smtpClient($smtpServer); $From = notification@paris.com; $To = $recipient; $Title = "Notification from Ops Mgr. $alert_name $alert_Severity"; $Body = @" Notification from Operations Manager 2007 RepeatCount: $alert_RepeatCount Raised: $alert_TimeRaised Name: $alert_name Object: $alert_MonitoringObjectDisplayName Priority: $alert_Priority Severity: $alert_Severity Description: $alert_description"@ $SmtpClient.Send($From,$To,$Title,$Body); # Update Custom Field 1 on the alert. Else the script will send multiple e-mails for the same alert $alert = Get-Alert \| where {$_.Id -eq $Alert_ID}; $alert.Customfield1 = "Ops Mgr has sent e-mail to $recipient"; $alert.Update(""); }; };};
Configure command line execution settings as depicted in the image. Create
	Next steps: Enable newly created rule for ‘all objects of class: Root Management Server’ by using an override. (more info...)

Scenario 4: Account locked out x number of times in a 24 hour period

Disclaimer: This is another complex scenario and I am again not sure that my proposed solution is the simplest...it works though! J

Prerequisites

OpsMgr agent installed on domain controllers (more info...)
Notification Channel, Subscriber & Subscription configured (more info...)
Enable ‘Audit Account Management’ for the ‘Default Domain Controllers Policy’ (more info... and how to)

Step-By-Step

(Create one suppressed alert per locked out user account. Add 1 to the ‘RepeatCount’ for each subsequent occurrence in a 24 hour period. Create a rule to auto-resolve all related active alerts. Create a rule to send hourly notifications when the ‘RepeatCount’ exceeds xx.)

Create an ‘Alert Generating Rule’ as below:
(more info... and how to)

Operations Console > Authoring > Rules > Create a new rule Note Create a new destination management pack if required. Next
Select > ‘Windows Domain Controller’ Note Un-tick the ‘Rule is enabled’ checkbox. Next
Select Security as the log name. Next
Configure the event expression as depicted in the image. Next	We will use the following event id in this section: 644 - A user account was auto locked.
Change the severity and priority settings as required. Alert Suppression
Configure the alert suppression fields as depicted in the image. Ok
Create
	Next steps: Enable newly created rule for ‘all objects of class: Windows Domain Controller’ by using an override. (more info...) Repeat ‘Create a rule to resolve all Unsuccessful Logon Alerts on a daily basis’ section in scenario 3 above. Repeat ‘Create a rule to send notification when RepeatCount equal xx within nn hours’ in scenario 3 above.