O365_Unified_Auditlog_parser

1.0

O365_Unified_Auditlog_parser.ps1

                                
<#PSScriptInfo

.VERSION 1.0

.GUID 2082a2b3-155c-42e5-b3f6-c67434a0a3e1

.AUTHOR mikko@lavento.com

.COMPANYNAME 

.COPYRIGHT 

.TAGS O365, UnifiedAuditlog, Auditlog, parser

.LICENSEURI 

.PROJECTURI 

.ICONURI 

.EXTERNALMODULEDEPENDENCIES 

.REQUIREDSCRIPTS 

.EXTERNALSCRIPTDEPENDENCIES

.RELEASENOTES

#> 

<# 

.DESCRIPTION 

O365 Unified Auditlog parser

#> 

Param()

# 26.5.2018 M.Lavento

# O365 auditlog (Unified log) parser

# Applies to logs downloaded from https://protection.office.com - Search & investigation - Audit log search - Download .csv

#

# Downloaded log has 4 colums 

# CreationDate | UserIds | Operations | Auditdata

# Problem: the most important one (Auditdata) is "string mess" where data is delimited with ; , and [] and you can't really import it to excel to filter reasonably.

# Also problem: different services log more or less data so no fixed amount of columns

# Solution: delimiter to be used while importing to Excel seems to be "," BUT NOT INSIDE brackets [{ }] so we change all "," --> �� as delimiter inside brackets []

# Delimiter char changes atleast for me to �� --> ??, but it doesn't really matter

# Then we can split and construct a table in a format where it is csv exportable

# But first Columns for the result table# 

# Bad thing is that cloumns has to be known beforehand.

# Used Microsoft's own info what they might be and I added atleast five extra ones what came up while testing

# https://support.office.com/en-us/article/detailed-properties-in-the-office-365-audit-log-ce004100-9e7f-443e-942b-9b04098fcfc3

# But because it's Microsoft and there might be more in the future or misinterpretations in the code we have to create the headers.

# I created column name Miscellaneous as the last column

$columnheaders = `

"CreationDate",`

"UserIds",`

"Operations",`

"Actor",`

"ActorContextId",`

"ActorIpAddress",`

"AddOnName",`

"AddOnType",`

"ApplicationDisplayName",`

"ApplicationId",`

"AzureActiveDirectoryEventType",`

"ChannelGuid",`

"ChannelName",`

"Client",`

"ClientInfoString",`

"ClientIP",`

"ClientIPAddress",`

"CorrelationId",`

"CreationTime",`

"CustomUniqueId",`

"DestinationFileExtension",`

"DestinationFileName",`

"DestinationRelativeUrl",`

"EventData",`

"EventSource",`

"ExternalAccess",`

"ExtendedProperties",`

"ID",`

"InternalLogonType",`

"InterSystemsId",`

"IntraSystemId",`

"ItemType",`

"ListId",`

"ListItemUniqueId",`

"LoginStatus",`

"LogonError",`

"LogonType",`

"MailboxGuid",`

"MailboxOwnerUPN",`

"Members",`

"ModifiedProperties (Name, NewValue, OldValue)",`

"ObjectID",`

"Operation",`

"OrganizationID",`

"OrganizationName",`

"OriginatingServer",`

"Path",`

"Parameters",`

"RecordType",`

"ResultStatus",`

"SecurityComplianceCenterEventType",`

"SharingType",`

"Site",`

"SiteUrl",`

"SourceFileExtension",`

"SourceFileName",`

"SourceRelativeUrl",`

"Subject",`

"TabType",`

"Target",`

"TargetContextId",`

"TeamGuid",`

"TeamName",`

"UserAgent",`

"UserDomain",`

"UserID",`

"UserKey",`

"UserSharedWith",`

"UserType",`

"Version",`

"WebId",`

"Workload",`

"Miscellaneous"

############# Main script

#Open dialog by Dan Stolts

$openFileDialog = New-Object windows.forms.openfiledialog   

$openFileDialog.initialDirectory = [System.IO.Directory]::GetCurrentDirectory()   

$openFileDialog.title = "Select Log File to be parsered"   

$openFileDialog.filter = "CSV Files|*.csv|All Files|*.*" 

$openFileDialog.ShowHelp = $True   

Write-Host "Select Downloaded Settings File... (see FileOpen Dialog)" -ForegroundColor Green  

$result = $openFileDialog.ShowDialog()   # Display the Dialog / Wait for user response 

# in ISE you may have to alt-tab or minimize ISE to see dialog box 

$result 

if($result -eq "OK")    {    

    Write-Host "Selected Downloaded Settings File:"  -ForegroundColor Green  

    $OpenFileDialog.filename   

} 

else { Write-Host "File Selection Cancelled!" -ForegroundColor Yellow; exit} 

$logsource = $openFileDialog.FileName

$logdirectory = Split-Path -Parent $logsource

$exported_log = $logsource -replace ".csv","_parsered.csv"

#Progressbar Start time

$PBStartTime = Get-Date

$log = Import-Csv -Path $logsource

#Choose �� for chars replacing the , inside certain Auditdata's values, namely between: [{ }] 

#check if there is already �� in original log to be sure

$ErotinCount = [regex]::matches($log,����).count

if ($ErotinCount -eq 0)

{

$ErotinChar = "��"

}

else

{

$ErotinChar = "�M�"   

}

#total amount of rows in the log

$rivienmaara = $log.count

$rivilaskuri = 0

#create table to be populated, if exists then remove

$tabName = "O365LogTable"

if (Get-Variable -Name table -ErrorAction SilentlyContinue)

{

Remove-Variable table

}

$table = New-Object system.Data.DataTable �$tabName�

# Build table columns

$columnloop = 0

$cols = @()

$colheaders = @()

do

{

$cols += $columnheaders[$columnloop]

$colheaders += New-Object system.Data.DataColumn $cols[$columnloop],([string])

#Add the Columns

$table.columns.add($colheaders[$columnloop])

$columnloop++

}

until ($columnloop -gt ($columnheaders.count)-1)

# Begin to parser line by line

do

{

$string = $log[$rivilaskuri]

$parseredstring = $string

#trimming brackets 

$parseredstring.Auditdata = $parseredstring.Auditdata.Trim("{","}")

$parseredstringaudit = $parseredstring.AuditData

    #NonGreedy, fecth only  [{ }] and all of them to regex-groups

    $AllMatches = $parseredstringaudit | Select-String -Pattern "\[{.*?\}]" -AllMatches | foreach {$_.Matches}

    $matchcount = $AllMatches.Count

    if($AllMatches.Success)            

    {            

        #if only one hit, then don't iterate by items

        if($matchcount -eq 1){

            $old = $AllMatches.Value

            $New = $old -replace ",",$ErotinChar

            $parseredstringaudit = $parseredstringaudit.Replace($old,$new)

            $parsered = $parseredstringaudit

        }

        else

        {

            $matchloop = 0

            #loop line with regex-hits and replace comma (,) --> �� ONLY inside [{ }] 

            do

            {

            $old = $AllMatches[$matchloop].Value

            $New = $old -replace ",",$ErotinChar

            $parseredstringaudit = $parseredstringaudit.Replace($old,$new)

            $parsered = $parseredstringaudit

            $matchloop++

            }

            until ($matchloop -gt $matchcount-1)

         }

     }

    ######## Done replacing between [{ }]

    #after that we still have to look if there is ", " (<=  ,<empty>) in the line 

    #NonGreedy, fecth only  ", " and all of them to regex-groups

    $AllMatches = $parseredstringaudit | Select-String -Pattern "\, " -AllMatches | foreach {$_.Matches}

    $matchcount = $AllMatches.Count

    if($AllMatches.Success)            

    {                    

        #if only one hit, then don't iterate by items

        if($matchcount -eq 1){

            $old = $AllMatches.Value

            $New = $old -replace ",",$ErotinChar

            $parseredstringaudit = $parseredstringaudit.Replace($old,$new)

            $parsered = $parseredstringaudit

        }

        else

        {

            $matchloop = 0

            #loop line with regex-hits and replace comma (,) --> �� ONLY inside [{ }] 

            do

            {

            $old = $AllMatches[$matchloop].Value

            $New = $old -replace ",",$ErotinChar

            $parseredstringaudit = $parseredstringaudit.Replace($old,$new)

            $parsered = $parseredstringaudit

            $matchloop++

            }

            until ($matchloop -gt $matchcount-1)

         }

     }

        ######## Done ", " -replacements

        # and now we are able to split

        $parseredsplitted = $parsered.Split(",")

        $parseredsplitcount = $parseredsplitted.Count

        $splitloop = 0

        #Create a row to table

        $row = $table.NewRow()

        #loop and get headers and values

        do

        {

        #header (left-part) and value (right part)

        $pos = $parseredsplitted[$splitloop].IndexOf(":")

        $leftPart = $parseredsplitted[$splitloop].Substring(0, $pos)

        $rightpart = $parseredsplitted[$splitloop].Substring($pos+1)

        #trim "

        $leftPart = $leftPart.Trim('"','"')

        $rightpart = $rightpart.Trim('"','"')

        ##### populate the values based on headers

        ##### best part of this that you can populate table by pointing to header names.

        ##### we don't have to worry about missing column values in the log row

        #find matching header "number"

        $colnumber = $table.Columns.IndexOf($leftPart)

        #If there is no match then use Miscellaneous-column

        if ($colnumber -eq "-1")

        {

        $colnumber = $table.Columns.IndexOf("Miscellaneous")

        Write-Host "No column, using misc, linenumber: $rivilaskuri"

        }

        #Enter data in the row

        $row.($cols[$colnumber]) = $rightpart

        $splitloop++

        }

        until ($splitloop -gt $parseredsplitcount-1)

        #Let's add three first columns to row from the original log

        $row.($cols[0]) = $log[$rivilaskuri].CreationDate

        $row.($cols[1]) = $log[$rivilaskuri].UserIds

        $row.($cols[2]) = $log[$rivilaskuri].Operations

        #Add the populated row to the table

        $table.Rows.Add($row)

        #skip to next line in log

        $rivilaskuri++   

        #Show some progresinfo to user

        ## -- Calculate The Percentage Completed

        [Int]$Percentage = ($rivilaskuri/$rivienmaara)*100

        #$PB.Value = $Percentage

        #calculate seconds

        $SecondsElapsed = ((Get-Date) - $PBStartTime).TotalSeconds

        $SecondsRemaining = ($SecondsElapsed / ($rivilaskuri/$rivienmaara)) - $SecondsElapsed

        #transform to more readable format

        $kulsek =  [timespan]::fromseconds($SecondsElapsed)

        $sekunnitkulunut = $kulsek.ToString("hh\:mm\:ss")

        $jalsek =  [timespan]::fromseconds($SecondsRemaining)

        $sekunnitjaljella = $jalsek.ToString("hh\:mm\:ss")

        Write-Progress -Activity "Prosessing" -Status "Processing: $rivilaskuri / $rivienmaara Elapsed Time: $sekunnitkulunut, Estimated time left: $sekunnitjaljella" -PercentComplete $Percentage

}

until ($rivilaskuri -gt $rivienmaara-1)

#close the bar

Write-Progress -Activity "Prosessing" -Status "Ready" -Completed

#Display the table

#$table | Format-Table

$table | Export-Csv -Path $exported_log -NoTypeInformation

Write-Host "`nOriginal log: $logsource" -ForegroundColor Yellow 

Write-Host "Parsered log: $exported_log`n" -ForegroundColor Yellow 

# Ask user if wants to open web-page where O365 detailed log is

Write-host "Would you like to open in browser detailed O365-log properties webpage (Microsoft's)?" -ForegroundColor Yellow 

    $Readhost = Read-Host " ( y / n ) " 

    Switch ($ReadHost) 

     { 

       Y {Write-host "Yes,opening"; Start-Process "https://support.office.com/en-us/article/detailed-properties-in-the-office-365-audit-log-ce004100-9e7f-443e-942b-9b04098fcfc3"} 

       N {Write-Host "No"; $PublishSettings=$false} 

       Default {Write-Host "Default, opening"; Start-Process "https://support.office.com/en-us/article/detailed-properties-in-the-office-365-audit-log-ce004100-9e7f-443e-942b-9b04098fcfc3"} 

     } 

# Ask user if wants to open Folder of Parsered-csv 

Write-host "Would you like to open Folder of End-Product ie. Parsered-csv?" -ForegroundColor Yellow 

    $Readhost = Read-Host " ( y / n ) " 

    Switch ($ReadHost) 

     { 

       Y {Write-host "Yes,opening"; Invoke-Item $logdirectory} 

       N {Write-Host "No"; $PublishSettings=$false} 

       Default {Write-Host "Default, opening"; Invoke-Item $logdirectory} 

     }