Since my last blog about the Secure App Model I’ve been playing with using it in different cases such as collecting automatic documentation, but also using it as an early warning tool for events our helpdesk might want to monitor.

One of these tasks is monitoring the creation of new Teams. We like keeping our clients environments in check but of course we also love the teams structure that anyone can create a team at any moment to jump right into their work. The issue with this is often one of compliance and security – We need to be aware of creation to apply the correct processes to the Team and maybe assist the end-user in further setup.

To do this I’ve made the following script; The script uses the Graph API to find all current teams. It then alerts on any team that has been created in the last day. You can of course modify this to your own needs by changing the $MonitorDate variable.

All Tenants script:

##############################
$MonitorDate = (get-date).AddDays(-1)
$ApplicationId = 'XXXX-XXXX-XXXX-XXX-XXX'
$ApplicationSecret = 'YourApplicationSecret' | Convertto-SecureString -AsPlainText -Force
$TenantID = 'YourTenantID.Onmicrosoft.com'
$RefreshToken = 'VeryLongRefreshToken'
##############################
$credential = New-Object System.Management.Automation.PSCredential($ApplicationId, $ApplicationSecret)
write-host "Generating access tokens" -ForegroundColor Green
$graphToken = New-PartnerAccessToken -ApplicationId $ApplicationId -Credential $credential -RefreshToken $refreshToken -Scopes 'https://graph.microsoft.com/.default' -ServicePrincipal -Tenant $tenantID 
write-host "Connecting to MSOLService" -ForegroundColor Green
Connect-MsolService -AdGraphAccessToken $aadGraphToken.AccessToken -MsGraphAccessToken $graphToken.AccessToken
write-host "Grabbing client list" -ForegroundColor Green
$customers = Get-MsolPartnerContract -All
write-host "Connecting to clients" -ForegroundColor Green

foreach ($customer in $customers) {
    write-host "Generating token for $($Customer.name)" -ForegroundColor Green
    $graphToken = New-PartnerAccessToken -ApplicationId $ApplicationId -Credential $credential -RefreshToken $refreshToken -Scopes 'https://graph.microsoft.com/.default' -ServicePrincipal -Tenant $customer.TenantID
    $Header = @{
        Authorization = "Bearer $($graphToken.AccessToken)"
    }
    write-host "Grabbing Teams for $($Customer.name)" -ForegroundColor Green
    $GroupUri = "https://graph.microsoft.com/v1.0/Groups?`$top=999"
    $Groups = (Invoke-RestMethod -Uri $GroupUri -Headers $Header -Method Get -ContentType "application/json").value | Where-Object { $_.resourceProvisioningOptions -eq "Team" }
    $NewGroups = foreach ($group in $Groups | Where-Object { [datetime]$_.CreatedDateTime -gt $MonitorDate }) { 
        "$($Group.displayName) has been created on $($group.createdDateTime)"
    
    }
}
if(!$NewGroups){ $NewGroups = "Healthy. No New groups have been created."} 

this script grabs the new-teams for each of the tenants under your administration and alerts into $NewGroups is a group is newer than the date you’ve given.

Single Tenant script:

##############################
$MonitorDate = (get-date).AddDays(-1)
$ApplicationId = 'XXXX-XXXX-XXXX-XXX-XXX'
$ApplicationSecret = 'YourApplicationSecret' | Convertto-SecureString -AsPlainText -Force
$TenantID = 'TenantYouWantTOLogInto.Onmicrost.com'
$RefreshToken = 'VeryLongRefreshToken'
##############################
$credential = New-Object System.Management.Automation.PSCredential($ApplicationId, $ApplicationSecret)
write-host "Generating access tokens" -ForegroundColor Green
$graphToken = New-PartnerAccessToken -ApplicationId $ApplicationId -Credential $credential -RefreshToken $refreshToken -Scopes 'https://graph.microsoft.com/.default' -ServicePrincipal -Tenant $tenantID 
write-host "Connecting to MSOLService" -ForegroundColor Green
Connect-MsolService -AdGraphAccessToken $aadGraphToken.AccessToken -MsGraphAccessToken $graphToken.AccessToken
    $Header = @{
        Authorization = "Bearer $($graphToken.AccessToken)"
    }
    write-host "Grabbing Teams" -ForegroundColor Green
    $GroupUri = "https://graph.microsoft.com/v1.0/Groups?`$top=999"
    $Groups = (Invoke-RestMethod -Uri $GroupUri -Headers $Header -Method Get -ContentType "application/json").value | Where-Object { $_.resourceProvisioningOptions -eq "Team" }
    $NewGroups = foreach ($group in $Groups | Where-Object { [datetime]$_.CreatedDateTime -gt $MonitorDate }) { 
        "$($Group.displayName) has been created on $($group.createdDateTime)"
    
    }
if(!$NewGroups){ $NewGroups = "Healthy. No New groups have been created."}

And that’s it! hope it helps, and as always, Happy PowerShelling.