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+<#
+=============================================================================================
+Name:           Audit File Access in SharePoint Online using PowerShell
+Version:        1.0
+Website:        o365reports.com
+
+~~~~~~~~~~~~~~~~~~
+Script Highlights:
+~~~~~~~~~~~~~~~~~~
+1. The script uses modern authentication to retrieve audit logs.     
+2. The script can be executed with an MFA enabled account too.     
+3. The script retrieves file access audit log for 180 days, by default.
+4. Allows you generate file access audit report for a custom period. 
+5. Helps to find recently accessed files. e.g., Files accessed in the last 30 days. 
+6. Exports report results to CSV file.     
+7. Identifies file accessed by external/guest users. 
+8. Helps to monitor all files accessed by a specific user.
+9. Helps to track SharePoint Online file accesses alone
+10.Tracks OneDrive file accesses alone.
+11.Finds files accessed by a specific person in the specific period   
+12. Automatically installs the EXO module (if not installed already) upon your confirmation.   
+13. The script is scheduler friendly. i.e., Credentials can be passed as a parameter instead of saved inside the script. 
+14. The script supports Certificate-based Authentication (CBA) too.
+
+For detailed script execution: https://o365reports.com/2024/01/30/audit-file-access-in-sharepoint-online-using-powershell 
+============================================================================================
+#>
+
+Param
+(
+    [Parameter(Mandatory = $false)]
+    [Nullable[DateTime]]$StartDate,
+    [Nullable[DateTime]]$EndDate,
+    [Int]$RecentlyAccessedFiles_In_Days,
+    [Switch]$SharePointOnlineOnly,
+    [Switch]$OneDriveOnly,
+    [switch]$FileAccessedByExternalUsersOnly,
+    [String]$AccessedBy,
+    [string]$Organization,
+    [string]$ClientId,
+    [string]$CertificateThumbprint,
+    [string]$UserName,
+    [string]$Password
+)
+
+Function Connect_Exo
+{
+ #Check for EXO module inatallation
+ $Module = Get-Module ExchangeOnlineManagement -ListAvailable
+ if($Module.count -eq 0) 
+ { 
+  Write-Host Exchange Online PowerShell module is not available  -ForegroundColor yellow  
+  $Confirm= Read-Host Are you sure you want to install module? [Y] Yes [N] No 
+  if($Confirm -match "[yY]") 
+  { 
+   Write-host "Installing Exchange Online PowerShell module"
+   Install-Module ExchangeOnlineManagement -Repository PSGallery -AllowClobber -Force -Scope CurrentUser
+   Import-Module ExchangeOnlineManagement
+  } 
+  else 
+  { 
+   Write-Host EXO module is required to connect Exchange Online.Please install module using Install-Module ExchangeOnlineManagement cmdlet. 
+   Exit
+  }
+ } 
+ Write-Host Connecting to Exchange Online...
+ #Storing credential in script for scheduling purpose/ Passing credential as parameter - Authentication using non-MFA account
+ if(($UserName -ne "") -and ($Password -ne ""))
+ {
+  $SecuredPassword = ConvertTo-SecureString -AsPlainText $Password -Force
+  $Credential  = New-Object System.Management.Automation.PSCredential $UserName,$SecuredPassword
+  Connect-ExchangeOnline -Credential $Credential
+ }
+ elseif($Organization -ne "" -and $ClientId -ne "" -and $CertificateThumbprint -ne "")
+ {
+   Connect-ExchangeOnline -AppId $ClientId -CertificateThumbprint $CertificateThumbprint  -Organization $Organization -ShowBanner:$false
+ }
+ else
+ {
+  Connect-ExchangeOnline
+ }
+}
+
+$MaxStartDate=((Get-Date).AddDays(-179)).Date
+
+if($RecentlyAccessedFiles_In_Days -ne "")
+{
+ $StartDate=((Get-Date).AddDays(-$RecentlyAccessedFiles_In_Days)).Date
+ $EndDate=(Get-Date).Date
+}
+#Retrieving Audit log for the past 180 days
+if(($StartDate -eq $null) -and ($EndDate -eq $null))
+{
+ $EndDate=(Get-Date).Date
+ $StartDate=$MaxStartDate
+}
+#Getting start date for audit report
+While($true)
+{
+ if ($StartDate -eq $null)
+ {
+  $StartDate=Read-Host Enter start time for report generation '(Eg:12/15/2023)'
+ }
+ Try
+ {
+  $Date=[DateTime]$StartDate
+  if($Date -ge $MaxStartDate)
+  { 
+   break
+  }
+  else
+  {
+   Write-Host `nAudit can be retrieved only for the past 180 days. Please select a date after $MaxStartDate -ForegroundColor Red
+   return
+  }
+ }
+ Catch
+ {
+  Write-Host `nNot a valid date -ForegroundColor Red
+ }
+}
+
+
+#Getting end date to retrieve audit log
+While($true)
+{
+ if ($EndDate -eq $null)
+ {
+  $EndDate=Read-Host Enter End time for report generation '(Eg: 12/15/2023)'
+ }
+ Try
+ {
+  $Date=[DateTime]$EndDate
+  if($EndDate -lt ($StartDate))
+  {
+   Write-Host End time should be later than start time -ForegroundColor Red
+   return
+  }
+  break
+ }
+ Catch
+ {
+  Write-Host `nNot a valid date -ForegroundColor Red
+ }
+}
+
+$OutputCSV=".\Audit_File_Access_Report$((Get-Date -format yyyy-MMM-dd-ddd` hh-mm` tt).ToString()).csv" 
+$IntervalTimeInMinutes=1440    #$IntervalTimeInMinutes=Read-Host Enter interval time period '(in minutes)'
+$CurrentStart=$StartDate
+$CurrentEnd=$CurrentStart.AddMinutes($IntervalTimeInMinutes)
+
+#Check whether CurrentEnd exceeds EndDate
+if($CurrentEnd -gt $EndDate)
+{
+ $CurrentEnd=$EndDate
+}
+
+if($CurrentStart -eq $CurrentEnd)
+{
+ Write-Host Start and end time are same.Please enter different time range -ForegroundColor Red
+ Exit
+}
+
+Connect_EXO
+$AggregateResults = @()
+$CurrentResult= @()
+$CurrentResultCount=0
+$AggregateResultCount=0
+Write-Host `nRetrieving file access audit log from $StartDate to $EndDate... -ForegroundColor Yellow
+$i=0
+$ExportResult=""   
+$ExportResults=@()  
+$Operations="FileAccessed"
+
+if($FileAccessedByExternalUsersOnly.IsPresent)
+{
+ $UserIds="*#EXT*"
+}
+elseif($AccessedBy -ne "")
+{
+ $UserIds=$AccessedBy
+}
+else
+{
+ $UserIds="*"
+}
+
+while($true)
+{ 
+ #Getting audit data for the given time range
+ $Results=Search-UnifiedAuditLog -StartDate $CurrentStart -EndDate $CurrentEnd -Operations $Operations -UserIds $UserIds -SessionId s -SessionCommand ReturnLargeSet -ResultSize 5000
+ $ResultCount=($Results | Measure-Object).count
+ $AllAuditData=@()
+ foreach($Result in $Results)
+ {
+  $i++
+  $PrintFlag="True"
+  $MoreInfo=$Result.auditdata
+  $AuditData=$Result.auditdata | ConvertFrom-Json
+  $ActivityTime=(Get-Date($AuditData.CreationTime)).ToLocalTime()  #Get-Date($AuditData.CreationTime) Uncomment to view the Activity Time in UTC
+  $UserID=$AuditData.userId
+  $AccessedFile=$AuditData.SourceFileName
+  $FileExtension=$AuditData.SourceFileExtension
+  $SiteURL=$AuditData.SiteURL
+  $Workload=$AuditData.Workload
+
+  if($SharePointOnlineOnly.IsPresent -and ($Workload -ne "SharePoint"))
+  {
+   $PrintFlag="False"
+  }
+
+  if($OneDriveOnly.IsPresent -and ($Workload -ne "OneDrive"))
+  {
+   $PrintFlag="False"
+  }
+
+  #Export result to csv
+  if($PrintFlag -eq "True")
+  {
+   $OutputEvents++
+  $ExportResult=@{'Accessed Time'=$ActivityTime;'Accessed By'=$UserID;'Workload'=$Workload;'More Info'=$MoreInfo;'Accessed File'=$AccessedFile;'Site URL'=$SiteURL;'File Extension'=$FileExtension}
+  $ExportResults= New-Object PSObject -Property $ExportResult  
+  $ExportResults | Select-Object 'Accessed Time','Accessed By','Accessed File','Site URL','File Extension','Workload','More Info' | Export-Csv -Path $OutputCSV -Notype -Append 
+ }
+ }
+ Write-Progress -Activity "`n     Retrieving file access audit data from $StartDate to $EndDate.."`n" Processed audit record count: $i"
+ $currentResultCount=$CurrentResultCount+$ResultCount
+ 
+ if($CurrentResultCount -ge 50000)
+ {
+  Write-Host Retrieved max record for current range.Proceeding further may cause data loss or rerun the script with reduced time interval. -ForegroundColor Red
+  $Confirm=Read-Host `nAre you sure you want to continue? [Y] Yes [N] No
+  if($Confirm -match "[Y]")
+  {
+   Write-Host Proceeding audit log collection with data loss
+   [DateTime]$CurrentStart=$CurrentEnd
+   [DateTime]$CurrentEnd=$CurrentStart.AddMinutes($IntervalTimeInMinutes)
+   $CurrentResultCount=0
+   if($CurrentEnd -gt $EndDate)
+   {
+    $CurrentEnd=$EndDate
+   }
+  }
+  else
+  {
+   Write-Host Please rerun the script with reduced time interval -ForegroundColor Red
+   Exit
+  }
+ }
+ 
+ if($ResultCount -lt 5000)
+ { 
+  if($CurrentEnd -eq $EndDate)
+  {
+   break
+  }
+  $CurrentStart=$CurrentEnd 
+  if($CurrentStart -gt (Get-Date))
+  {
+   break
+  }
+  $CurrentEnd=$CurrentStart.AddMinutes($IntervalTimeInMinutes)
+  $CurrentResultCount=0
+  if($CurrentEnd -gt $EndDate)
+  {
+   $CurrentEnd=$EndDate
+  }
+ }                                                                                             
+ $ResultCount=0
+}
+
+#Open output file after execution
+If($OutputEvents -eq 0)
+{
+ Write-Host No records found
+}
+else
+{
+ Write-Host `nThe output file contains $OutputEvents audit records
+ if((Test-Path -Path $OutputCSV) -eq "True") 
+ {
+  Write-Host `n "The Output file availble in:" -NoNewline -ForegroundColor Yellow; Write-Host "$OutputCSV" `n 
+  $Prompt = New-Object -ComObject wscript.shell   
+  $UserInput = $Prompt.popup("Do you want to open output file?",`   
+ 0,"Open Output File",4)   
+  If ($UserInput -eq 6)   
+  {   
+   Invoke-Item "$OutputCSV"   
+  } 
+ }
+}
+Write-Host `n~~ Script prepared by AdminDroid Community ~~`n -ForegroundColor Green
+Write-Host "~~ Check out " -NoNewline -ForegroundColor Green; Write-Host "admindroid.com" -ForegroundColor Yellow -NoNewline; Write-Host " to get access to 1800+ Microsoft 365 reports. ~~" -ForegroundColor Green `n`n
+
+#Disconnect Exchange Online session
+Disconnect-ExchangeOnline -Confirm:$false -InformationAction Ignore -ErrorAction SilentlyContinue
\ No newline at end of file