💼 Management Samenvatting
Schakel uit Netwerkpaden as hyperlinks voorkomt NTLM credential harvesting via UNC path links in emails (\\attacker.com\share) die automatische SMB connections maken bij preview.
Aanbeveling
IMPLEMENT
Risico zonder
High
Risk Score
7/10
Implementatie
2u (tech: 1u)
Van toepassing op:
✓ Microsoft Outlook
UNC hyperlinks is Diefstal van inloggegevens: Email bevat \\attacker.com\share → user previews email → Outlook auto-converts to hyperlink → SMB connection automatische → NTLM hash sent. Zonder disable: Reading pane preview triggers SMB (no click needed), NTLM hash captured door attacker, Offline hash cracking.
Implementatie
Schakel uit UNC hyperlinks: Netwerkpaden stay plain text (no clickable links), No automatische SMB connections, User moet handmatige copy/paste (deliberate action).
Vereisten
- Outlook 2016+
- Intune of GPO
Implementatie
Intune Settings Catalog: Outlook\Security → Replace Netwerkpaden met hyperlinks: Disabled.
Compliance en Auditing
BIO 09.04 (credential bescherming), ISO 27001 A.9.4.3.
Monitoring
Gebruik PowerShell-script network-paths-hyperlinks-disabled.ps1 (functie Invoke-Monitoring) – Controleren.
Remediatie
Gebruik PowerShell-script network-paths-hyperlinks-disabled.ps1 (functie Invoke-Remediation) – Herstellen.
Compliance & Frameworks
- BIO: 09.04.03 -
- ISO 27001:2022: A.9.4.3 -
Automation
Gebruik het onderstaande PowerShell script om deze security control te monitoren en te implementeren. Het script bevat functies voor zowel monitoring (-Monitoring) als remediation (-Remediation).
PowerShell
# Control: O365-OU-000027 - network paths hyperlinks disabled
#Requires -Version 5.1
# DISA STIG Microsoft Office 365 ProPlus v3r3
param(
[string]$RegistryPath = "HKCU:\Software\Policies\Microsoft\Office\16.0\OUTLOOK\Security",
[switch]$Monitoring,
[switch]$Remediation,
[switch]$Revert,
[switch]$WhatIf
)
function Invoke-Monitoring {
Write-Host "Monitoring O365-OU-000027: network paths hyperlinks disabled" -ForegroundColor Green
try {
$valueName = "networkpathshyperlinksdisabled"
$expectedValue = 1
if (-not (Test-Path $RegistryPath)) {
Write-Host "✗ Registry path does not exist: $RegistryPath" -ForegroundColor Red
return $false
}
$currentValue = Get-ItemProperty -Path $RegistryPath -Name $valueName -ErrorAction SilentlyContinue
if ($currentValue -and $currentValue.$valueName -eq $expectedValue) {
Write-Host "✓ Control compliant: $valueName = $expectedValue" -ForegroundColor Green
return $true
}
else {
$actualValue = if ($currentValue) { $currentValue.$valueName } else { "Not Set" }
Write-Host "✗ Control non-compliant: $valueName = $actualValue (Expected: $expectedValue)" -ForegroundColor Red
return $false
}
}
catch {
Write-Host "✗ Error checking registry setting: $($_.Exception.Message)" -ForegroundColor Red
return $false
}
}
function Invoke-Remediation {
Write-Host "Remediating O365-OU-000027: network paths hyperlinks disabled" -ForegroundColor Yellow
try {
if (-not (Test-Path $RegistryPath)) {
Write-Host "Creating registry path: $RegistryPath" -ForegroundColor Yellow
New-Item -Path $RegistryPath -Force | Out-Null
}
$valueName = "networkpathshyperlinksdisabled"
$expectedValue = 1
Set-ItemProperty -Path $RegistryPath -Name $valueName -Value $expectedValue -Type DWord -Force
Write-Host "✓ Registry value set successfully: $valueName = $expectedValue" -ForegroundColor Green
Start-Sleep -Seconds 1
$complianceResult = Invoke-Monitoring
return $complianceResult
}
catch {
Write-Host "✗ Error configuring registry setting: $($_.Exception.Message)" -ForegroundColor Red
return $false
}
}
function Invoke-Revert {
Write-Host "Reverting O365-OU-000027: network paths hyperlinks disabled
" -ForegroundColor Yellow
try {
if ($WhatIf) {
Write-Host " [WhatIf] Would remove registry value" -ForegroundColor Cyan
return $true
}
$valueName = "networkpathshyperlinksdisabled"
if (Test-Path $RegistryPath) {
Remove-ItemProperty -Path $RegistryPath -Name $valueName -ErrorAction SilentlyContinue
Write-Host " Removed registry value: $valueName" -ForegroundColor Green
}
return $true
}
catch {
Write-Host " Error during revert: # Control: O365-OU-000027 - network paths hyperlinks disabled
#Requires -Version 5.1
# DISA STIG Microsoft Office 365 ProPlus v3r3
param(
[string]$RegistryPath = "HKCU:\Software\Policies\Microsoft\Office\16.0\OUTLOOK\Security",
[switch]$Monitoring,
[switch]$Remediation,
[switch]$Revert,
[switch]$WhatIf
)
function Invoke-Monitoring {
Write-Host "Monitoring O365-OU-000027: network paths hyperlinks disabled" -ForegroundColor Green
try {
$valueName = "networkpathshyperlinksdisabled"
$expectedValue = 1
if (-not (Test-Path $RegistryPath)) {
Write-Host "✗ Registry path does not exist: $RegistryPath" -ForegroundColor Red
return $false
}
$currentValue = Get-ItemProperty -Path $RegistryPath -Name $valueName -ErrorAction SilentlyContinue
if ($currentValue -and $currentValue.$valueName -eq $expectedValue) {
Write-Host "✓ Control compliant: $valueName = $expectedValue" -ForegroundColor Green
return $true
} else {
$actualValue = if ($currentValue) { $currentValue.$valueName } else { "Not Set" }
Write-Host "✗ Control non-compliant: $valueName = $actualValue (Expected: $expectedValue)" -ForegroundColor Red
return $false
}
} catch {
Write-Host "✗ Error checking registry setting: $($_.Exception.Message)" -ForegroundColor Red
return $false
}
}
function Invoke-Remediation {
Write-Host "Remediating O365-OU-000027: network paths hyperlinks disabled" -ForegroundColor Yellow
try {
if (-not (Test-Path $RegistryPath)) {
Write-Host "Creating registry path: $RegistryPath" -ForegroundColor Yellow
New-Item -Path $RegistryPath -Force | Out-Null
}
$valueName = "networkpathshyperlinksdisabled"
$expectedValue = 1
Set-ItemProperty -Path $RegistryPath -Name $valueName -Value $expectedValue -Type DWord -Force
Write-Host "✓ Registry value set successfully: $valueName = $expectedValue" -ForegroundColor Green
Start-Sleep -Seconds 1
$complianceResult = Invoke-Monitoring
return $complianceResult
} catch {
Write-Host "✗ Error configuring registry setting: $($_.Exception.Message)" -ForegroundColor Red
return $false
}
}
if ($Monitoring) {
$result = Invoke-Monitoring
exit $(if ($result) { 0 } else { 1 })
}
elseif ($Remediation) {
$result = Invoke-Remediation
exit $(if ($result) { 0 } else { 1 })
}
elseif ($Revert) {
$result = Invoke-Revert
exit $(if ($result) { 0 } else { 1 })
}
else {
Write-Host "Usage: [-Monitoring] [-Remediation] [-Revert] [-WhatIf]" -ForegroundColor Yellow
}
}
catch {
Write-Host "Script execution error: # Control: O365-OU-000027 - network paths hyperlinks disabled
#Requires -Version 5.1
# DISA STIG Microsoft Office 365 ProPlus v3r3
param(
[string]$RegistryPath = "HKCU:\Software\Policies\Microsoft\Office\16.0\OUTLOOK\Security",
[switch]$Monitoring,
[switch]$Remediation,
[switch]$Revert,
[switch]$WhatIf
)
function Invoke-Monitoring {
Write-Host "Monitoring O365-OU-000027: network paths hyperlinks disabled" -ForegroundColor Green
try {
$valueName = "networkpathshyperlinksdisabled"
$expectedValue = 1
if (-not (Test-Path $RegistryPath)) {
Write-Host "✗ Registry path does not exist: $RegistryPath" -ForegroundColor Red
return $false
}
$currentValue = Get-ItemProperty -Path $RegistryPath -Name $valueName -ErrorAction SilentlyContinue
if ($currentValue -and $currentValue.$valueName -eq $expectedValue) {
Write-Host "✓ Control compliant: $valueName = $expectedValue" -ForegroundColor Green
return $true
}
else {
$actualValue = if ($currentValue) { $currentValue.$valueName } else { "Not Set" }
Write-Host "✗ Control non-compliant: $valueName = $actualValue (Expected: $expectedValue)" -ForegroundColor Red
return $false
}
}
catch {
Write-Host "✗ Error checking registry setting: $($_.Exception.Message)" -ForegroundColor Red
return $false
}
}
function Invoke-Remediation {
Write-Host "Remediating O365-OU-000027: network paths hyperlinks disabled" -ForegroundColor Yellow
try {
if (-not (Test-Path $RegistryPath)) {
Write-Host "Creating registry path: $RegistryPath" -ForegroundColor Yellow
New-Item -Path $RegistryPath -Force | Out-Null
}
$valueName = "networkpathshyperlinksdisabled"
$expectedValue = 1
Set-ItemProperty -Path $RegistryPath -Name $valueName -Value $expectedValue -Type DWord -Force
Write-Host "✓ Registry value set successfully: $valueName = $expectedValue" -ForegroundColor Green
Start-Sleep -Seconds 1
$complianceResult = Invoke-Monitoring
return $complianceResult
}
catch {
Write-Host "✗ Error configuring registry setting: $($_.Exception.Message)" -ForegroundColor Red
return $false
}
}
function Invoke-Revert {
Write-Host "Reverting O365-OU-000027: network paths hyperlinks disabled
" -ForegroundColor Yellow
try {
if ($WhatIf) {
Write-Host " [WhatIf] Would remove registry value" -ForegroundColor Cyan
return $true
}
$valueName = "networkpathshyperlinksdisabled"
if (Test-Path $RegistryPath) {
Remove-ItemProperty -Path $RegistryPath -Name $valueName -ErrorAction SilentlyContinue
Write-Host " Removed registry value: $valueName" -ForegroundColor Green
}
return $true
}
catch {
Write-Host " Error during revert: # Control: O365-OU-000027 - network paths hyperlinks disabled
#Requires -Version 5.1
# DISA STIG Microsoft Office 365 ProPlus v3r3
param(
[string]$RegistryPath = "HKCU:\Software\Policies\Microsoft\Office\16.0\OUTLOOK\Security",
[switch]$Monitoring,
[switch]$Remediation,
[switch]$Revert,
[switch]$WhatIf
)
function Invoke-Monitoring {
Write-Host "Monitoring O365-OU-000027: network paths hyperlinks disabled" -ForegroundColor Green
try {
$valueName = "networkpathshyperlinksdisabled"
$expectedValue = 1
if (-not (Test-Path $RegistryPath)) {
Write-Host "✗ Registry path does not exist: $RegistryPath" -ForegroundColor Red
return $false
}
$currentValue = Get-ItemProperty -Path $RegistryPath -Name $valueName -ErrorAction SilentlyContinue
if ($currentValue -and $currentValue.$valueName -eq $expectedValue) {
Write-Host "✓ Control compliant: $valueName = $expectedValue" -ForegroundColor Green
return $true
} else {
$actualValue = if ($currentValue) { $currentValue.$valueName } else { "Not Set" }
Write-Host "✗ Control non-compliant: $valueName = $actualValue (Expected: $expectedValue)" -ForegroundColor Red
return $false
}
} catch {
Write-Host "✗ Error checking registry setting: $($_.Exception.Message)" -ForegroundColor Red
return $false
}
}
function Invoke-Remediation {
Write-Host "Remediating O365-OU-000027: network paths hyperlinks disabled" -ForegroundColor Yellow
try {
if (-not (Test-Path $RegistryPath)) {
Write-Host "Creating registry path: $RegistryPath" -ForegroundColor Yellow
New-Item -Path $RegistryPath -Force | Out-Null
}
$valueName = "networkpathshyperlinksdisabled"
$expectedValue = 1
Set-ItemProperty -Path $RegistryPath -Name $valueName -Value $expectedValue -Type DWord -Force
Write-Host "✓ Registry value set successfully: $valueName = $expectedValue" -ForegroundColor Green
Start-Sleep -Seconds 1
$complianceResult = Invoke-Monitoring
return $complianceResult
} catch {
Write-Host "✗ Error configuring registry setting: $($_.Exception.Message)" -ForegroundColor Red
return $false
}
}
if ($Monitoring) {
$result = Invoke-Monitoring
exit $(if ($result) { 0 } else { 1 })
} elseif ($Remediation) {
$result = Invoke-Remediation
exit $(if ($result) { 0 } else { 1 })
} else {
Write-Host "Usage: .\network-paths-hyperlinks-disabled.ps1 [-Monitoring] [-Remediation]" -ForegroundColor Yellow
Write-Host " -Monitoring: Check current compliance status" -ForegroundColor White
Write-Host " -Remediation: Apply recommended configuration" -ForegroundColor White
}
" -ForegroundColor Red
return $false
}
}
# Main execution
try {
if ($Monitoring) {
$result = Invoke-Monitoring
exit $(if ($result) { 0 } else { 1 })
}
elseif ($Remediation) {
$result = Invoke-Remediation
exit $(if ($result) { 0 } else { 1 })
}
else {
Write-Host "Usage: .\network-paths-hyperlinks-disabled.ps1 [-Monitoring] [-Remediation]" -ForegroundColor Yellow
Write-Host " -Monitoring: Check current compliance status" -ForegroundColor White
Write-Host " -Remediation: Apply recommended configuration" -ForegroundColor White
}
" -ForegroundColor Red
exit 1
}
" -ForegroundColor Red
return $false
}
}
# Main execution
try {
if ($Monitoring) {
$result = Invoke-Monitoring
exit $(if ($result) { 0 } else { 1 })
}
elseif ($Remediation) {
$result = Invoke-Remediation
exit $(if ($result) { 0 } else { 1 })
}
elseif ($Revert) {
$result = Invoke-Revert
exit $(if ($result) { 0 } else { 1 })
}
else {
Write-Host "Usage: [-Monitoring] [-Remediation] [-Revert] [-WhatIf]" -ForegroundColor Yellow
}
}
catch {
Write-Host "Script execution error: # Control: O365-OU-000027 - network paths hyperlinks disabled
#Requires -Version 5.1
# DISA STIG Microsoft Office 365 ProPlus v3r3
param(
[string]$RegistryPath = "HKCU:\Software\Policies\Microsoft\Office\16.0\OUTLOOK\Security",
[switch]$Monitoring,
[switch]$Remediation,
[switch]$Revert,
[switch]$WhatIf
)
function Invoke-Monitoring {
Write-Host "Monitoring O365-OU-000027: network paths hyperlinks disabled" -ForegroundColor Green
try {
$valueName = "networkpathshyperlinksdisabled"
$expectedValue = 1
if (-not (Test-Path $RegistryPath)) {
Write-Host "✗ Registry path does not exist: $RegistryPath" -ForegroundColor Red
return $false
}
$currentValue = Get-ItemProperty -Path $RegistryPath -Name $valueName -ErrorAction SilentlyContinue
if ($currentValue -and $currentValue.$valueName -eq $expectedValue) {
Write-Host "✓ Control compliant: $valueName = $expectedValue" -ForegroundColor Green
return $true
} else {
$actualValue = if ($currentValue) { $currentValue.$valueName } else { "Not Set" }
Write-Host "✗ Control non-compliant: $valueName = $actualValue (Expected: $expectedValue)" -ForegroundColor Red
return $false
}
} catch {
Write-Host "✗ Error checking registry setting: $($_.Exception.Message)" -ForegroundColor Red
return $false
}
}
function Invoke-Remediation {
Write-Host "Remediating O365-OU-000027: network paths hyperlinks disabled" -ForegroundColor Yellow
try {
if (-not (Test-Path $RegistryPath)) {
Write-Host "Creating registry path: $RegistryPath" -ForegroundColor Yellow
New-Item -Path $RegistryPath -Force | Out-Null
}
$valueName = "networkpathshyperlinksdisabled"
$expectedValue = 1
Set-ItemProperty -Path $RegistryPath -Name $valueName -Value $expectedValue -Type DWord -Force
Write-Host "✓ Registry value set successfully: $valueName = $expectedValue" -ForegroundColor Green
Start-Sleep -Seconds 1
$complianceResult = Invoke-Monitoring
return $complianceResult
} catch {
Write-Host "✗ Error configuring registry setting: $($_.Exception.Message)" -ForegroundColor Red
return $false
}
}
function Invoke-Revert {
Write-Host "Reverting O365-OU-000027: network paths hyperlinks disabled
" -ForegroundColor Yellow
try {
if ($WhatIf) {
Write-Host " [WhatIf] Would remove registry value" -ForegroundColor Cyan
return $true
}
$valueName = "networkpathshyperlinksdisabled"
if (Test-Path $RegistryPath) {
Remove-ItemProperty -Path $RegistryPath -Name $valueName -ErrorAction SilentlyContinue
Write-Host " Removed registry value: $valueName" -ForegroundColor Green
}
return $true
} catch {
Write-Host " Error during revert: # Control: O365-OU-000027 - network paths hyperlinks disabled
#Requires -Version 5.1
# DISA STIG Microsoft Office 365 ProPlus v3r3
param(
[string]$RegistryPath = "HKCU:\Software\Policies\Microsoft\Office\16.0\OUTLOOK\Security",
[switch]$Monitoring,
[switch]$Remediation,
[switch]$Revert,
[switch]$WhatIf
)
function Invoke-Monitoring {
Write-Host "Monitoring O365-OU-000027: network paths hyperlinks disabled" -ForegroundColor Green
try {
$valueName = "networkpathshyperlinksdisabled"
$expectedValue = 1
if (-not (Test-Path $RegistryPath)) {
Write-Host "✗ Registry path does not exist: $RegistryPath" -ForegroundColor Red
return $false
}
$currentValue = Get-ItemProperty -Path $RegistryPath -Name $valueName -ErrorAction SilentlyContinue
if ($currentValue -and $currentValue.$valueName -eq $expectedValue) {
Write-Host "✓ Control compliant: $valueName = $expectedValue" -ForegroundColor Green
return $true
}
else {
$actualValue = if ($currentValue) { $currentValue.$valueName } else { "Not Set" }
Write-Host "✗ Control non-compliant: $valueName = $actualValue (Expected: $expectedValue)" -ForegroundColor Red
return $false
}
}
catch {
Write-Host "✗ Error checking registry setting: $($_.Exception.Message)" -ForegroundColor Red
return $false
}
}
function Invoke-Remediation {
Write-Host "Remediating O365-OU-000027: network paths hyperlinks disabled" -ForegroundColor Yellow
try {
if (-not (Test-Path $RegistryPath)) {
Write-Host "Creating registry path: $RegistryPath" -ForegroundColor Yellow
New-Item -Path $RegistryPath -Force | Out-Null
}
$valueName = "networkpathshyperlinksdisabled"
$expectedValue = 1
Set-ItemProperty -Path $RegistryPath -Name $valueName -Value $expectedValue -Type DWord -Force
Write-Host "✓ Registry value set successfully: $valueName = $expectedValue" -ForegroundColor Green
Start-Sleep -Seconds 1
$complianceResult = Invoke-Monitoring
return $complianceResult
}
catch {
Write-Host "✗ Error configuring registry setting: $($_.Exception.Message)" -ForegroundColor Red
return $false
}
}
if ($Monitoring) {
$result = Invoke-Monitoring
exit $(if ($result) { 0 } else { 1 })
}
elseif ($Remediation) {
$result = Invoke-Remediation
exit $(if ($result) { 0 } else { 1 })
}
else {
Write-Host "Usage: .\network-paths-hyperlinks-disabled.ps1 [-Monitoring] [-Remediation]" -ForegroundColor Yellow
Write-Host " -Monitoring: Check current compliance status" -ForegroundColor White
Write-Host " -Remediation: Apply recommended configuration" -ForegroundColor White
}
" -ForegroundColor Red
return $false
}
}
# Main execution
try {
if ($Monitoring) {
$result = Invoke-Monitoring
exit $(if ($result) { 0 } else { 1 })
} elseif ($Remediation) {
$result = Invoke-Remediation
exit $(if ($result) { 0 } else { 1 })
} else {
Write-Host "Usage: .\network-paths-hyperlinks-disabled.ps1 [-Monitoring] [-Remediation]" -ForegroundColor Yellow
Write-Host " -Monitoring: Check current compliance status" -ForegroundColor White
Write-Host " -Remediation: Apply recommended configuration" -ForegroundColor White
}
" -ForegroundColor Red
exit 1
}
Risico zonder implementatie
Risico zonder implementatie
High: Hoog: UNC hyperlinks is NTLM Diefstal van inloggegevens via email preview.
Management Samenvatting
Schakel uit Netwerkpaden hyperlinks. Blokkeert SMB credential harvesting. Implementatie: 1-2 uur.
- Implementatietijd: 2 uur
- FTE required: 0.01 FTE