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https://github.com/Yamato-Security/WELA.git
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102 lines
4.1 KiB
PowerShell
102 lines
4.1 KiB
PowerShell
# Step 1: Run the auditpol command using cmd.exe and redirect its output to a file
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$outputFilePath = "auditpol_output.txt"
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Start-Process -FilePath "cmd.exe" -ArgumentList "/c chcp 437 & auditpol /get /category:* /r > $outputFilePath" -NoNewWindow -Wait
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$auditpolOutput = Get-Content -Path $outputFilePath
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$filteredOutput = $auditpolOutput | Select-String -NotMatch "No Auditing"
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$extractedStrings = [System.Collections.Generic.HashSet[string]]::new()
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$filteredOutput | ForEach-Object {
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if ($_ -match '{(.*?)}') {
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[void]$extractedStrings.Add($matches[1])
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}
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}
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[void]$extractedStrings.Add("00000000-0000-0000-0000-000000000000")
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# Step 2: Read the rules from security_rules.json
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$jsonFilePath = "./config/security_rules.json"
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$jsonContent = Get-Content -Path $jsonFilePath -Raw | ConvertFrom-Json
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foreach ($rule in $jsonContent) {
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$rule | Add-Member -MemberType NoteProperty -Name "applicable" -Value $false
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foreach ($guid in $rule.subcategory_guids) {
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if ($extractedStrings.Contains($guid)) {
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$rule.applicable = $true
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break
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}
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}
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}
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$rules = $jsonContent
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# Step 4: Count the number of usable and unusable rules for each level
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$usableRules = $rules | Where-Object { $_.applicable -eq $true }
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$unusableRules = $rules | Where-Object { $_.applicable -eq $false }
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$totalCounts = $rules | Group-Object -Property level | ForEach-Object {
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[PSCustomObject]@{
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Level = $_.Name
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Count = $_.Count
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}
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}
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$usableCounts = $usableRules | Group-Object -Property level | ForEach-Object {
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[PSCustomObject]@{
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Level = $_.Name
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Count = $_.Count
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}
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}
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$unusableCounts = $unusableRules | Group-Object -Property level | ForEach-Object {
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[PSCustomObject]@{
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Level = $_.Name
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Count = $_.Count
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}
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}
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# Step 5: Calculate the percentages
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$usablePercentages = $usableCounts | ForEach-Object {
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$total = ($totalCounts | Where-Object Level -match $PSItem.Level | Select-Object -ExpandProperty Count)[0]
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[PSCustomObject]@{
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Level = $PSItem.Level
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UsableCount = $PSItem.Count
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TotalCount = $total
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Percentage = "{0:N2}" -f ($PSItem.Count / $total * 100)
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}
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}
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$unusablePercentages = $unusableCounts | ForEach-Object {
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$total = ($totalCounts | Where-Object Level -match $PSItem.Level | Select-Object -ExpandProperty Count)[0]
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[PSCustomObject]@{
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Level = $PSItem.Level
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UnusableCount = $PSItem.Count
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TotalCount = $total
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Percentage = "{0:N2}" -f ($PSItem.Count / $total * 100)
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}
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}
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# Step 6: Generate the required outputtotal
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$customOrder = @("critical", "high", "medium", "low", "informational")
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Write-Output "Checking event log audit settings. Please wait."
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Write-Output ""
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Write-Output "Detection rules that can be used on this system versus total possible rules:"
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$usablePercentages = $usablePercentages | Sort-Object { $customOrder.IndexOf($_.Level) }
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$usablePercentages | ForEach-Object {
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Write-Output "$($_.Level) rules: $($_.UsableCount) / $($_.TotalCount) ($($_.Percentage)%)"
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}
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Write-Output ""
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Write-Output "Detection rules that cannot be used on this system:"
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$unusablePercentages = $unusablePercentages | Sort-Object { $customOrder.IndexOf($_.Level) }
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$unusablePercentages | ForEach-Object {
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Write-Output "$($_.Level) rules: $($_.UnusableCount) / $($_.TotalCount) ($($_.Percentage)%)"
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}
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Write-Output ""
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Write-Output "Usable detection rules list saved to: UsableRules.csv"
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Write-Output "Unusable detection rules list saved to: UnusableRules.csv"
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Write-Output ""
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$totalUsable = ($usablePercentages | Measure-Object -Property UsableCount -Sum).Sum
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$totalRulesCount = ($totalCounts | Measure-Object -Property Count -Sum).Sum
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$utilizationPercentage = "{0:N2}" -f (($totalUsable / $totalRulesCount) * 100)
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Write-Output "You can utilize $utilizationPercentage% of your detection rules."
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# Step 7: Save the lists of usable and unusable rules to CSV files
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$usableRules | Select-Object title, level, id | Export-Csv -Path "UsableRules.csv" -NoTypeInformation
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$unusableRules | Select-Object title, level, id | Export-Csv -Path "UnusableRules.csv" -NoTypeInformation
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