functions/User/Get-HawkUserMailSendActivity.ps1
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Function Get-HawkUserMailSendActivity { <# .SYNOPSIS This will export Send operations from the Unified Audit Log (UAL). Must be connected to Exchange Online using the Connect-EXO or Connect-ExchangeOnline module. M365 E5 or G5 license is required for this function to work. This telemetry will ONLY be availabe if Advanced Auditing is enabled for the M365 user. .DESCRIPTION This function queries for message-sending activity within Exchange, providing visibility into outbound communications that could be relevant for identifying data exfiltration attempts, phishing campaigns, or other malicious activity. .PARAMETER UserPrincipalName Specific user(s) to be investigated .EXAMPLE Get-HawkUserMailSendActivity -UserPrincipalName bsmith@contoso.com Returns send activity queries from Unified Audit Log (UAL) that correspond to the UserPrincipalName that is provided .OUTPUTS SendActivity_bsmith@contoso.com.csv /json Simple_SendActivity_bsmith@contoso.com.csv/json .LINK https://www.microsoft.com/security/blog/2020/12/21/advice-for-incident-responders-on-recovery-from-systemic-identity-compromises/ .NOTES "Operation Properties" and "Folders" will return "System.Object" as they are nested JSON within the AuditData field. You will need to conduct individual log pull and review via PowerShell or other SIEM to determine values for those fields. #> [CmdletBinding()] param( [Parameter(Mandatory = $true)] [array]$UserPrincipalName ) BEGIN { # Check if Hawk object exists and is fully initialized if (Test-HawkGlobalObject) { Initialize-HawkGlobalObject } Test-EXOConnection Send-AIEvent -Event "CmdRun" }#End Begin PROCESS { #Verify UPN input [array]$UserArray = Test-UserObject -ToTest $UserPrincipalName foreach ($UserObject in $UserArray) { [string]$User = $UserObject.UserPrincipalName Out-LogFile "Initiating collection of mail 'Send' logs for $User from the UAL." -Action Out-LogFile "Please be patient, this can take a while..." -Information # Verify that user has operation enabled for auditing. Otherwise, move onto next user. if (Test-OperationEnabled -User $User -Operation 'Send') { Out-LogFile "Operation 'Send' verified enabled for $User." -Information try { #Retrieve all audit data for Exchange send activity $SearchCommand = "Search-UnifiedAuditLog -Operations 'Send' -UserIds $User" $ExchangeSends = Get-AllUnifiedAuditLogEntry -UnifiedSearch $SearchCommand if ($ExchangeSends.Count -gt 0) { #Define output directory path for user $UserFolder = Join-Path -Path $Hawk.FilePath -ChildPath $User #Create user directory if it doesn't already exist if (-not (Test-Path -Path $UserFolder)) { New-Item -Path $UserFolder -ItemType Directory -Force | Out-Null } #Compress raw data into more simple view $ExchangeSendsSimple = $ExchangeSends | Get-SimpleUnifiedAuditLog #Export both raw and simplistic views to specified user's folder $ExchangeSends | Select-Object -ExpandProperty AuditData | Convertfrom-Json | Out-MultipleFileType -FilePrefix "SendActivity_$User" -User $User -csv -json $ExchangeSendsSimple | Out-MultipleFileType -FilePrefix "Simple_SendActivity_$User" -User $User -csv -json } else { Out-LogFile "No mail 'Send' logs found for $User." -Information } } catch { Out-LogFile "Error processing Send Activity for $User : $_" -isError Write-Error -ErrorRecord $_ -ErrorAction Continue } } else { Out-LogFile "Operation 'Send' is not enabled for $User." -Information Out-LogFile "No data recorded for $User." -Information } Out-LogFile "Completed collection of mail 'Send' logs for $User from the UAL." -Information } }#End Process END { }#End End } |