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Audit File Sharing in MS Teams
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<#
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=============================================================================================
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Name: Audit File Sharing Activities in Microsoft Teams Channels
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Version: 1.0
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Website: o365reports.com
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Script Highlights:
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~~~~~~~~~~~~~~~~~
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1. The script automatically verifies and installs the Exchange Online PowerShell module (if not already installed) upon your confirmation.
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2. Tracks all file sharing activities in Microsoft Teams Channels across your tenant.
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3. Finds files shared by external users in Microsoft Teams.
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4. The script can be executed with an MFA-enabled account as well.
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5. Finds files shared in a specific team and channel.
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6. It exports the report result to CSV format.
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7. It can be executed with Certificate-based Authentication too.
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8. The script is scheduler friendly.
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For detailed Script execution: https://o365reports.com/2025/04/02/how-to-audit-file-sharing-activities-in-microsoft-teams/
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============================================================================================
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#>
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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]]$EndDate,
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[switch]$ByExternalUsersOnly,
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[string]$TeamName,
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[string]$ChannelName,
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[string]$Organization,
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[string]$ClientId,
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[string]$CertificateThumbprint,
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[string]$UserName,
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[string]$Password
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)
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$MaxStartDate=((Get-Date).AddDays(-180)).Date
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#Retrive audit log for the past 180 days
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if(($StartDate -eq $null) -and ($EndDate -eq $null)) {
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$EndDate=(Get-Date).Date
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$StartDate=$MaxStartDate
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}
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#Getting start date to audit export report
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While($true) {
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if ($StartDate -eq $null) {
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$StartDate=Read-Host Enter start time for report generation '(Eg:09/24/2024)'
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}
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try {
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$Date=[DateTime]$StartDate
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if($Date -ge $MaxStartDate) {
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break
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}
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else {
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Write-Host `nAudit can be retrieved only for the past 180 days. Please select a date after $($MaxStartDate.ToString("MM/dd/yyyy.")) -ForegroundColor Red
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return
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}
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}
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Catch {
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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 export audit report
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While($true) {
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if ($EndDate -eq $null) {
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$EndDate=Read-Host Enter End time for report generation '(Eg: 9/24/2024)'
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}
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try {
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$Date=[DateTime]$EndDate
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if($EndDate -lt ($StartDate)) {
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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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Write-Host `nNot a valid date -ForegroundColor Red
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}
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}
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Function Connect_Exo
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{
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#Check for EXO module inatallation
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$Module = Get-Module ExchangeOnlineManagement -ListAvailable
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if($Module.count -eq 0) {
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Write-Host Exchange Online PowerShell 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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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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Write-Host EXO 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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$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 $Credential -ShowBanner:$false
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}
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elseif($Organization -ne "" -and $ClientId -ne "" -and $CertificateThumbprint -ne "") {
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Connect-ExchangeOnline -AppId $ClientId -CertificateThumbprint $CertificateThumbprint -Organization $Organization -ShowBanner:$false
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}
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else {
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Connect-ExchangeOnline -ShowBanner:$false
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}
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}
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Connect_Exo
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$Location=Get-Location
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$OutputCSV="$Location\Audit_Teams_File_Sharing_Activities_$((Get-Date -format yyyy-MMM-dd-ddd` hh-mm` tt).ToString()).csv"
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$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(checks for 1st iteration)
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if($CurrentEnd -gt $EndDate) {
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$CurrentEnd=$EndDate
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}
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$AggregateResults = 0
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$CurrentResult= @()
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$CurrentResultCount=0
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$FileSharingActivitiesCount=0
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Write-Host `nRetrieving audit log from $StartDate to $EndDate... -ForegroundColor Cyan
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while($true) {
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if($CurrentStart -eq $CurrentEnd) {
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Write-Host Start and end time are same.Please enter different time range -ForegroundColor Red
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Exit
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}
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else {
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$Results=Search-UnifiedAuditLog -StartDate $CurrentStart -EndDate $CurrentEnd -Operations 'FileUploaded' -SessionId s -SessionCommand ReturnLargeSet -ResultSize 5000
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}
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$AllAuditData=@()
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$AllAudits=$null
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foreach($Result in $Results) {
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$AuditData=$Result.auditdata | ConvertFrom-Json
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if (($AuditData.ApplicationDisplayName -match "Teams") -and ($AuditData.Workload -eq "SharePoint")) {
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$SharedTime = (Get-Date($AuditData.CreationTime)).ToLocalTime()
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$Team = $AuditData.SiteUrl -replace '^https://[^/]+/sites/([^/]+).*', '$1';
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$Channel = $AuditData.SourceRelativeUrl -replace '^Shared Documents/([^/]+).*', '$1'
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$SharedFile = $AuditData.SourceFileName
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$SharedBy = $AuditData.UserId
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$SharedFileURL = $AuditData.ObjectId
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$FileExtension = $AuditData.SourceFileExtension
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$SiteURL = $AuditData.SiteUrl
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$SharedFileRelativeURL = $AuditData.SourceRelativeUrl
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if (($ByExternalUsersOnly.IsPresent) -and ($AuditData.UserId -notmatch "#EXT#")) { continue }
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if ((!([string]::IsNullOrEmpty($TeamName))) -and ($TeamName -ne $Team)) { continue }
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if (!([string]::IsNullOrEmpty($ChannelName))) {
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if (!([string]::IsNullOrEmpty($TeamName))) {
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if (($TeamName -ne $Team) -or ($ChannelName -ne $Channel)) {
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continue
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}
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}
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else {
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Write-Host "`nError: TeamName param is mandatory to filter based on Channels." -ForegroundColor Red
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Exit
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}
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}
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$FileSharingActivitiesCount++
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$AllAudits=@{'Shared Time'=$SharedTime;'Shared File'=$SharedFile;'Shared by'=$SharedBy;'Site URL'=$SiteURL;'Team Name'=$Team;'Channel Name'=$Channel;'File Extension'=$FileExtension;'Shared File URL'=$SharedFileURL;'More Info'=$AuditData}
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$AllAuditData= New-Object PSObject -Property $AllAudits
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$AllAuditData | Sort 'Shared Time' | select 'Shared Time','Team Name','Channel Name','Shared File','Shared by','File Extension','Shared File URL','Site URL','More Info' | Export-Csv $OutputCSV -NoTypeInformation -Append
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}
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}
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$currentResultCount=$CurrentResultCount+($Results.count)
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$AggregateResults +=$Results.count
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Write-Progress -Activity "`n Retrieving audit log for $CurrentStart : $CurrentResultCount records"`n" Total processed audit record count: $AggregateResults"
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if(($CurrentResultCount -eq 50000) -or ($Results.count -lt 5000)) {
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if($CurrentResultCount -eq 50000) {
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Write-Host Retrieved max record for the 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 -notmatch "[Y]") {
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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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else {
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Write-Host Proceeding audit log collection with data loss
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}
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}
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#Check for last iteration
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if(($CurrentEnd -eq $EndDate)) {
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break
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}
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[DateTime]$CurrentStart=$CurrentEnd
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#Break loop if start date exceeds current date(There will be no data)
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if($CurrentStart -gt (Get-Date)) {
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break
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}
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[DateTime]$CurrentEnd=$CurrentStart.AddMinutes($IntervalTimeInMinutes)
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if($CurrentEnd -gt $EndDate) {
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$CurrentEnd=$EndDate
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}
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$CurrentResultCount=0
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$CurrentResult = @()
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}
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}
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Write-Host `n~~ Script prepared by AdminDroid Community ~~`n -ForegroundColor Green
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Write-Host "~~ Check out " -NoNewline -ForegroundColor Green; Write-Host "admindroid.com" -ForegroundColor Yellow -NoNewline; Write-Host " to get access to 1800+ Microsoft 365 reports. ~~" -ForegroundColor Green
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If($FileSharingActivitiesCount -eq 0) {
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Write-Host No records found
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}
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else {
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Write-Host `nThe output file contains $FileSharingActivitiesCount audit records.
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if((Test-Path -Path $OutputCSV) -eq "True") {
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Write-Host `n"The Output file available in: " -NoNewline -ForegroundColor Yellow
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Write-Host $OutputCSV
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$Prompt = New-Object -ComObject wscript.shell
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$UserInput = $Prompt.popup("Do you want to open output file?",0,"Open Output File",4)
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If ($UserInput -eq 6) {
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Invoke-Item "$OutputCSV"
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}
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}
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}
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#Disconnect Exchange Online session
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Disconnect-ExchangeOnline -Confirm:$false
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