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Audit Email Deletion in Office 365
Audit Email Deletion in Office 365
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AdminDroid
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Audit Email Deletion in Office 365/AuditDeletedEmails.ps1
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257
Audit Email Deletion in Office 365/AuditDeletedEmails.ps1
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Param
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(
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[Parameter(Mandatory = $false)]
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[Nullable[DateTime]]$StartDate,
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[Nullable[DateTime]]$EndDate,
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[string]$Mailbox,
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[string]$Subject,
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[string]$UserName,
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[string]$Password
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)
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Function Connect_Exo
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{
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#Check for EXO v2 module inatallation
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$Module = Get-Module ExchangeOnlineManagement -ListAvailable
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if($Module.count -eq 0)
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{
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Write-Host Exchange Online PowerShell V2 module is not available -ForegroundColor yellow
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$Confirm= Read-Host Are you sure you want to install module? [Y] Yes [N] No
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if($Confirm -match "[yY]")
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{
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Write-host "Installing Exchange Online PowerShell module"
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Install-Module ExchangeOnlineManagement -Repository PSGallery -AllowClobber -Force
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}
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else
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{
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Write-Host EXO V2 module is required to connect Exchange Online.Please install module using Install-Module ExchangeOnlineManagement cmdlet.
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Exit
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}
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}
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Write-Host Connecting to Exchange Online...
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#Storing credential in script for scheduling purpose/ Passing credential as parameter - Authentication using non-MFA account
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if(($UserName -ne "") -and ($Password -ne ""))
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{
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$SecuredPassword = ConvertTo-SecureString -AsPlainText $Password -Force
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$Credential = New-Object System.Management.Automation.PSCredential $UserName,$SecuredPassword
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Connect-ExchangeOnline -Credential $Credential
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}
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else
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{
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Connect-ExchangeOnline
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}
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}
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$MaxStartDate=((Get-Date).AddDays(-89)).Date
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#Getting anonymous activity for past 90 days
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if(($StartDate -eq $null) -and ($EndDate -eq $null))
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{
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$EndDate=(Get-Date).Date
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$StartDate=$MaxStartDate
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}
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#Getting start date to generate anonymous activity report
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While($true)
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{
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if ($StartDate -eq $null)
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{
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$StartDate=Read-Host Enter start time for report generation '(Eg:04/28/2021)'
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}
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Try
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{
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$Date=[DateTime]$StartDate
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if($Date -ge $MaxStartDate)
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{
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break
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}
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else
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{
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Write-Host `nAudit can be retrieved only for past 90 days. Please select a date after $MaxStartDate -ForegroundColor Red
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return
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}
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}
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Catch
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{
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Write-Host `nNot a valid date -ForegroundColor Red
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}
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}
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#Getting end date to generate external sharing report
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While($true)
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{
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if ($EndDate -eq $null)
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{
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$EndDate=Read-Host Enter End time for report generation '(Eg: 04/28/2021)'
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}
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Try
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{
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$Date=[DateTime]$EndDate
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if($EndDate -lt ($StartDate))
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{
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Write-Host End time should be later than start time -ForegroundColor Red
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return
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}
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break
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}
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Catch
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{
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Write-Host `nNot a valid date -ForegroundColor Red
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}
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}
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$OutputCSV=".\DeletedEmailsAuditReport_$((Get-Date -format yyyy-MMM-dd-ddd` hh-mm` tt).ToString()).csv"
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$IntervalTimeInMinutes=1440 #$IntervalTimeInMinutes=Read-Host Enter interval time period '(in minutes)'
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$CurrentStart=$StartDate
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$CurrentEnd=$CurrentStart.AddMinutes($IntervalTimeInMinutes)
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#Check whether CurrentEnd exceeds EndDate
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if($CurrentEnd -gt $EndDate)
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{
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$CurrentEnd=$EndDate
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}
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if($CurrentStart -eq $CurrentEnd)
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{
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Write-Host Start and end time are same.Please enter different time range -ForegroundColor Red
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Exit
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}
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Connect_EXO
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$CurrentResultCount=0
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$AggregateResultCount=0
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Write-Host `nRetrieving deleted emails from $StartDate to $EndDate...
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$ProcessedAuditCount=0
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$OutputEvents=0
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$ExportResult=""
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$ExportResults=@()
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$RetriveOperation="SoftDelete,HardDelete,MoveToDeletedItems"
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#Checking whether the user is available
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if(($Mailbox.Length -ne 0) -and ((Get-Mailbox -Identity $Mailbox) -eq $null))
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{
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Write-Host Mailbox does not exist. Please check the mailbox name. -ForegroundColor Red
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exit
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}
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while($true)
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{
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$ResultCount=0
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#Getting email deleted audit data for given time range
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Search-UnifiedAuditLog -StartDate $CurrentStart -EndDate $CurrentEnd -Operations $RetriveOperation -SessionId s -SessionCommand ReturnLargeSet -ResultSize 5000 | ForEach-Object {
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$currentResultCount=$CurrentResultCount+$ResultCount
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$ResultCount++
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$ProcessedAuditCount++
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Write-Progress -Activity "`n Retrieving email deletion activities from $CurrentStart to $CurrentEnd.."`n" Processed audit record count: $ProcessedAuditCount"
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$MoreInfo=$_.auditdata
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$Operation=$_.Operations
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$AuditData=$_.auditdata | ConvertFrom-Json
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$TargetMailbox=$AuditData.MailboxOwnerUPN
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#Filter to view deleted emails from specific mailbox
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if(($mailbox.Length -ne 0) -and ($Mailbox -ne $TargetMailbox))
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{
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return
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}
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$EmailSubject=$AuditData.AffectedItems.Subject
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if($EmailSubject -eq $null)
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{
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$EmailSubject="-"
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}
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$ConversationCount=$EmailSubject.count
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$Subjects=$EmailSubject -join ", "
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#Filter emails by subject
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if(($Subject.Length -ne 0) -and ($Subjects -notmatch $Subject))
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{
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return
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}
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$ActivityTime=Get-Date($AuditData.CreationTime) #(Get-Date($AuditData.CreationTime)).ToLocalTime() Uncomment to view the Activity Time in local time
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$PerformedBy=$AuditData.userId
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$ResultStatus=$AuditData.ResultStatus
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$Folder=$AuditData.Folder.Path.Split("\")[1]
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$EventData=$AuditData.EventData
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#Export result to csv
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$OutputEvents++
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$ExportResult=@{'Activity Time'=$ActivityTime;'Target Mailbox'=$TargetMailbox;'Activity'=$Operation;'Performed By'=$PerformedBy;'No. of Emails Deleted'=$ConversationCount;'Email Subjects'=$Subjects;'Folder'=$Folder;'Result Status'=$ResultStatus;'Workload'=$Workload;'More Info'=$MoreInfo}
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$ExportResults= New-Object PSObject -Property $ExportResult
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$ExportResults | Select-Object 'Activity Time','Activity','Target Mailbox','Performed By','No. of Emails Deleted','Email Subjects','Folder','Result Status','More Info' | Export-Csv -Path $OutputCSV -Notype -Append
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}
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if($CurrentResultCount -ge 50000)
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{
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Write-Host Retrieved max record for current range.Proceeding further may cause data loss or rerun the script with reduced time interval. -ForegroundColor Red
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$Confirm=Read-Host `nAre you sure you want to continue? [Y] Yes [N] No
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if($Confirm -match "[Y]")
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{
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Write-Host Proceeding audit log collection with data loss
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[DateTime]$CurrentStart=$CurrentEnd
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[DateTime]$CurrentEnd=$CurrentStart.AddMinutes($IntervalTimeInMinutes)
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$CurrentResultCount=0
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if($CurrentEnd -gt $EndDate)
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{
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$CurrentEnd=$EndDate
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}
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}
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else
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{
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Write-Host Please rerun the script with reduced time interval -ForegroundColor Red
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Exit
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}
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}
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if($ResultCount -lt 5000)
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{
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if($CurrentEnd -eq $EndDate)
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{
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break
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}
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$CurrentStart=$CurrentEnd
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if($CurrentStart -gt (Get-Date))
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{
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break
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}
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$CurrentEnd=$CurrentStart.AddMinutes($IntervalTimeInMinutes)
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$CurrentResultCount=0
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if($CurrentEnd -gt $EndDate)
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{
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$CurrentEnd=$EndDate
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}
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}
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}
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#Open output file after execution
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If($OutputEvents -eq 0)
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{
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Write-Host No records found
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}
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else
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{
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Write-Host `nThe output file contains $OutputEvents audit records
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if((Test-Path -Path $OutputCSV) -eq "True")
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{
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Write-Host `nThe Output file availble in $OutputCSV -ForegroundColor Green
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Write-Host `nFor more Office 365 related PowerShell scripts, check https://o365reports.com -ForegroundColor Cyan
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$Prompt = New-Object -ComObject wscript.shell
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$UserInput = $Prompt.popup("Do you want to open output file?",`
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0,"Open Output File",4)
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If ($UserInput -eq 6)
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{
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Invoke-Item "$OutputCSV"
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}
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}
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}
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<#
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=============================================================================================
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For detailed Script execution: https://o365reports.com/2021/09/02/audit-email-deletion-in-office-365-mailbox-powershell
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============================================================================================
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#>
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#Disconnect Exchange Online session
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Disconnect-ExchangeOnline -Confirm:$false -InformationAction Ignore -ErrorAction SilentlyContinue
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