Monitoring with PowerShell: Monitoring potential phishing campaigns

So Microsoft offers a lot of cool tools for Microsoft 365 users, even if you aren’t using the complete suite. One of these is potential phishing detection, by default Microsoft does an analysis of each received e-mail to check if they are potential phishing attempts. You can check these via the interface by going to protection.office.com, Threat Management and clicking on the dashboard.

Of course that’s nice to do a one-off check, but we like getting alerted whenever we see these phishing attempts get above a specific number. For this, we can of course use PowerShell.

By using the PowerShell cmdlet ‘Get-ATPTotalTrafficReport’ (Don’t worry, you don’t need ATP.) we can get the reports from the interface in text format. This allows us to alert whenever a phishing campaign is started and exceeds a threshold we set.

For these scripts you’ll need the Secure Application Model first, to be able to login securely and according to Microsoft’s partner standards. There’s two different versions of the script; one for a single tenant, and another for all tenants under your administration.

Single tenant version

All you have to do for the single tenant version is to enter your credentials, and set what you believe is the maximum phishing attempts for 2 weeks.

######### Secrets #########
$ApplicationId = 'YourAPPID'
$ApplicationSecret = 'Applicationsecret' | ConvertTo-SecureString -AsPlainText -Force
$TenantID = 'YourTenantID'
$RefreshToken = 'RefreshToken'
$ExchangeRefreshToken = 'ExchangeRefreshToken'
$UPN = "UPN-Used-To-Generate-Tokens"
$TenantToCheck = 'testtenant.onmicrosoft.com'
$MaximumPhishingAttempts = 100
######### Secrets #########

$credential = New-Object System.Management.Automation.PSCredential($ApplicationId, $ApplicationSecret)

$aadGraphToken = New-PartnerAccessToken -ApplicationId $ApplicationId -Credential $credential -RefreshToken $refreshToken -Scopes 'https://graph.windows.net/.default' -ServicePrincipal -Tenant $tenantID 
$graphToken = New-PartnerAccessToken -ApplicationId $ApplicationId -Credential $credential -RefreshToken $refreshToken -Scopes 'https://graph.microsoft.com/.default' -ServicePrincipal -Tenant $tenantID 
$token = New-PartnerAccessToken -ApplicationId 'a0c73c16-a7e3-4564-9a95-2bdf47383716'-RefreshToken $ExchangeRefreshToken -Scopes 'https://outlook.office365.com/.default' -Tenant $TenantToCheck -erroraction SilentlyContinue

$tokenValue = ConvertTo-SecureString "Bearer $($token.AccessToken)" -AsPlainText -Force
$credential = New-Object System.Management.Automation.PSCredential($upn, $tokenValue)
write-host "Proccessing $TenantToCheck"
$session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri "https://ps.outlook.com/powershell-liveid?DelegatedOrg=$($TenantToCheck)&BasicAuthToOAuthConversion=true" -Credential $credential -Authentication Basic -AllowRedirection -ErrorAction SilentlyContinue
$null = Import-PSSession $session -AllowClobber -CommandName 'Get-ATPTotalTrafficReport' -ErrorAction SilentlyContinue
$Reports = Get-ATPTotalTrafficReport -ErrorAction SilentlyContinue
$TenantReports = [PSCustomObject]@{
    TenantDomain       = $TenantToCheck
    TotalSafeLinkCount = ($Reports | where-object { $_.EventType -eq 'TotalSafeLinkCount' }).Messagecount
    TotalSpamCount     = ($Reports | where-object { $_.EventType -eq 'TotalSpamCount' }).Messagecount
    TotalBulkCount     = ($Reports | where-object { $_.EventType -eq 'TotalBulkCount' }).Messagecount
    TotalPhishCount    = ($Reports | where-object { $_.EventType -eq 'TotalPhishCount' }).Messagecount
    TotalMalwareCount  = ($Reports | where-object { $_.EventType -eq 'TotalMalwareCount' }).Messagecount
    DateOfReports      = "$($Reports.StartDate | Select-Object -Last 1) - $($Reports.EndDate | Select-Object -Last 1)"
}
#end of commands
Remove-PSSession $session -ErrorAction SilentlyContinue

$TenantReports | Where-Object {$_.TotalPhishCount -gt $MaximumPhishingAttempts}

Multiple tenant version

This version does the same as above, but then for all tenants under your administration as Microsoft Partner.

######### Secrets #########
$ApplicationId = 'YourAPPID'
$ApplicationSecret = 'Applicationsecret' | ConvertTo-SecureString -AsPlainText -Force
$TenantID = 'YourTenantID'
$RefreshToken = 'RefreshToken'
$ExchangeRefreshToken = 'ExchangeRefreshToken'
$UPN = "UPN-Used-To-Generate-Tokens"
$MaximumPhishingAttempts = 100
######### Secrets #########


$credential = New-Object System.Management.Automation.PSCredential($ApplicationId, $ApplicationSecret)
$aadGraphToken = New-PartnerAccessToken -ApplicationId $ApplicationId -Credential $credential -RefreshToken $refreshToken -Scopes 'https://graph.windows.net/.default' -ServicePrincipal -Tenant $tenantID 
$graphToken = New-PartnerAccessToken -ApplicationId $ApplicationId -Credential $credential -RefreshToken $refreshToken -Scopes 'https://graph.microsoft.com/.default' -ServicePrincipal -Tenant $tenantID 

Connect-MsolService -AdGraphAccessToken $aadGraphToken.AccessToken -MsGraphAccessToken $graphToken.AccessToken
$customers = Get-MsolPartnerContract -All
$TenantReports = foreach ($customer in $customers) {
    $token = New-PartnerAccessToken -ApplicationId 'a0c73c16-a7e3-4564-9a95-2bdf47383716'-RefreshToken $ExchangeRefreshToken -Scopes 'https://outlook.office365.com/.default' -Tenant $customer.TenantId -erroraction SilentlyContinue
    $tokenValue = ConvertTo-SecureString "Bearer $($token.AccessToken)" -AsPlainText -Force
    $credential = New-Object System.Management.Automation.PSCredential($upn, $tokenValue)
    $customerId = $customer.DefaultDomainName
    write-host "Proccessing $customerid"
    $session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri "https://ps.outlook.com/powershell-liveid?DelegatedOrg=$($customerId)&BasicAuthToOAuthConversion=true" -Credential $credential -Authentication Basic -AllowRedirection -ErrorAction SilentlyContinue
    $null = Import-PSSession $session -AllowClobber -CommandName 'Get-ATPTotalTrafficReport' -ErrorAction SilentlyContinue
    #From here you can enter your own commands
    $Reports = Get-ATPTotalTrafficReport -ErrorAction SilentlyContinue
    [PSCustomObject]@{
        TenantID           = $customer.TenantId
        TenantName         = $customer.name
        TenantDomain       = $customer.DefaultDomainName
        TotalSafeLinkCount = ($Reports | where-object { $_.EventType -eq 'TotalSafeLinkCount' }).Messagecount
        TotalSpamCount     = ($Reports | where-object { $_.EventType -eq 'TotalSpamCount' }).Messagecount
        TotalBulkCount     = ($Reports | where-object { $_.EventType -eq 'TotalBulkCount' }).Messagecount
        TotalPhishCount    = ($Reports | where-object { $_.EventType -eq 'TotalPhishCount' }).Messagecount
        TotalMalwareCount  = ($Reports | where-object { $_.EventType -eq 'TotalMalwareCount' }).Messagecount
        DateOfReports      = "$($Reports.StartDate | Select-Object -Last 1) - $($Reports.EndDate | Select-Object -Last 1)"
    }
    #end of commands
    Remove-PSSession $session -ErrorAction SilentlyContinue
}

$TenantReports | Where-Object {$_.TotalPhishCount -gt $MaximumPhishingAttempts}

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

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