Modifying Powershell to display Security Event log statistics for multiple computer

In security you mostly find only Information logs, which will be either Audit Success or Audit Failed. So you may not get any result with current code.

Ah I see,

So which section should be modified to reflect success or failure ?

And how to make it working for multiple server object ?

Filter using KeywordsDisplayNames

?{$_.KeywordsDisplayNames -match "Audit Failed"}

or

?{$_.KeywordsDisplayNames -match "Audit Success"}

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But It's depends what you trying to looks for.. There might be Error/warnings in security log but it's rare. If you want to capture the count for Audit success and failure its possible..

Any consideration to consolidate a central repository for the logs, eventlog-forwarder this way you need not have so much local storage allocated ........
and to others point, by the time you run the script, the event could be long gone.

Using SNMP, you can have the events of interest to you proactively appear and generate notification.
While at the same time logging, recording the events in a database, etc......


splunk is one such tool that can pull data from multipe....

Thanks SUbsun, I will give it a try now.

Arnold, Splunk is not free for anything larger than 1 GB. So is there any builtin Microsoft features that can do this event forwarding and notification ?

@Subsun:

it does not work when I tried in my local PC:

$logName = "Security"

#get date
$dateCurrent = Get-Date

#For the Week
$NDays = -7
$dateNDaysAgo = $dateCurrent.AddDays($NDays)

$logLevel = @("Critical", "Warning", "Error")
$logLevelCritical = "Critical"
$logLevelWarning = "Warning"
$logLevelError = "Error"

Write-Host "Log Entries since $dateNDaysAgo"

Get-WinEvent -Logname $logName  | `
	Where-Object {($_.timecreated -gt $date) -and ( ?{$_.KeywordsDisplayNames -match "Audit Failed"} )  } | `
	Group-Object ProviderName, KeywordsDisplayNames, ID | `
	Sort-Object Count -descending | `
	Format-Table Count, Name -auto

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There is no result displayed ?

Yes, splunk does what your powershell script....
The data aggregation is done using event forwarding, subscriptions.......

as long as you have a Windows 2008 or newer,
There are more detail through a search coming from the splunk site
Here is MS's basics steps.
https://msdn.microsoft.com/en-us/library/cc748890(v=ws.11).aspx

Dism /online /enable-feature:SNMP
Dism /online /enable-feature:WMIProvider

This will install/activate SNMP and wmi over snmp
You would need to configure one system as an SNMPTRP destination(the one where you plan running this powershell script

Evntwin is the graphical interface to specify which event shoul be sent via snmptrap.
You can select which options you want, then export
If you have the set, you can use evntcmd to load the exported data versus going through the GUI one system at a time.

Using GPO one can push all related SNMP destination, read community, to all AD computers..
The use of evntcmd in a computer configuration as a startup script ........ You can distribute these settings...

Made some changes.. Try this..

$logName = "Security"

#get date
$dateCurrent = Get-Date

#For the Week
$NDays = -7
$dateNDaysAgo = $dateCurrent.AddDays($NDays)

Write-Host "Log Entries since $dateNDaysAgo"

Get-WinEvent -Logname $logName |
	Where-Object {$_.timecreated -gt $dateNDaysAgo -and $_.KeywordsDisplayNames -match "Audit Failure"} | 
	Group-Object ProviderName,KeywordsDisplayNames,ID |
	Sort-Object Count -descending |
	Format-Table Count,Name -Auto

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Subsun,

Thanks for the reply, however, the script does not work when I execute in my Powershell ISE on my laptop as well as the server logging in as DOMAIN\Administrator.

Get-WinEvent : Could not retrieve information about the Security log. Error: Attempted to perform an unauthorized operation..
At line:12 char:1
+ Get-WinEvent -Logname $logName |
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Get-WinEvent], Exception
    + FullyQualifiedErrorId : LogInfoUnavailable,Microsoft.PowerShell.Commands.GetWinEventCommand
 
Get-WinEvent : There is not an event log on the localhost computer that matches "Security".
At line:12 char:1
+ Get-WinEvent -Logname $logName |
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Security:String) [Get-WinEvent], Exception
    + FullyQualifiedErrorId : NoMatchingLogsFound,Microsoft.PowerShell.Commands.GetWinEventCommand

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Script should suffice the requirement.