Monitoring with PowerShell: Monitoring Domain Admins logon

So this is one I’ve been researching for a new tool I’m creating. AzPAM, AzPAM will be a Privledged Access Management tool that will be living in your Azure environment, mostly designed for MSPs. If you want to see how AzPam looks or contribute, check out the Github page about it here. I should be pretty close to releasing an alpha version soon! 🙂

To make sure AzPAM can also work with local accounts and domain admin accounts I figured I might try to monitor when the account has logged on. It then dawned on me that this might be something you’ll want to monitor in general. We’ve talked about monitoring new admins and groups before, but never directly if a Domain Admin has logged on.

The Script

So this script checks the lastloggedon time stamp in Active Directory, and checks if this account has logged on in the last 24 hours. You can exclude accounts by adding it to the $ExcludeList variable.

$ExludedAdmins = "JamesDoe", "JohnDoe"

$GroupMembers = Get-ADGroupMember -Identity 'Domain Admins'
$LoggedOntoday = foreach ($member in $GroupMembers) {
    if ($member.name -in $ExludedAdmins) {
        write-host "Skipping $($member.name)" -ForegroundColor Green
        continue
    }
    $ADUser = Get-ADUser -Identity $member.sid -Properties 'LastLogonTimeStamp'
    if ($ADUser.lastlogontimestamp -eq $null) { continue }
    if ([datetime]::FromFileTime($ADUser.LastLogonTimeStamp) -gt (get-date).AddHours(-24)) { 
        "$($member.name) has logged on in the last 24 hours"
    }

}

if (!$LoggedOntoday) { "Healthy. No Domain Admins have logged on today" }

And that’s it! I know it’s a bit of a short one, but with all the work I’m doing on AzPAM I’ll be sure to make it up to you guys soon! As always, Happy PowerShelling.

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