T1113.md

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)

Atomic Tests

• Atomic Test #1 - Screencapture

• Atomic Test #2 - Screencapture (silent)

• Atomic Test #3 - X Windows Capture

• Atomic Test #4 - Capture Linux Desktop using Import Tool

Atomic Test #1 - Screencapture

Use screencapture command to collect a full desktop screenshot

Supported Platforms: macOS

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

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

Inputs:

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

Attack Commands: Run with bash!

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

Cleanup Commands:

rm #{output_file}

Atomic Test #4 - Capture Linux Desktop using Import Tool

Use import command from ImageMagick to collect a full desktop screenshot

Supported Platforms: Linux

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 --version; then exit 0; else exit 1; fi 

Get Prereq Commands:

sudo apt-get install imagemagick