T1113_screen-capture

T1113 Screen Capture

High-Level Description

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.

Kill Chain Phase

• Collection (TA0009)

Platforms: Linux, Windows, macOS

What to Check

• Identify if Screen Capture technique is applicable to target environment
• Check Linux systems for indicators of Screen Capture
• Check Windows systems for indicators of Screen Capture
• Check macOS systems for indicators of Screen Capture
• Assess detection coverage (1 detection strategies)

How to Test

Atomic Red Team Tests

The following tests are from Atomic Red Team and provide actionable ways to test this technique:

Atomic Test 1: Screencapture

Use screencapture command to collect a full desktop screenshot

Supported Platforms: macos

screencapture #{output_file}

Atomic Test 2: Screencapture (silent)

Use screencapture command to collect a full desktop screenshot

Supported Platforms: macos

screencapture -x #{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

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

Dependencies:

• Package with XWD and XWUD must exist on device

Atomic Test 4: X Windows Capture (freebsd)

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

Supported Platforms: linux

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

Dependencies:

• Package with XWD and XWUD must exist on device

Atomic Test 5: Capture Linux Desktop using Import Tool

Use import command from ImageMagick to collect a full desktop screenshot

Supported Platforms: linux

import -window root #{output_file}

Dependencies:

• ImageMagick must be installed

Manual Testing

If Atomic Red Team tests are not applicable, manually verify the technique by:

1. Identify Attack Surface: Determine if the target environment is susceptible to Screen Capture by examining the target platforms (Linux, Windows, macOS).

2. Assess Existing Defenses: Review whether mitigations for T1113 are in place. If defenses are absent or misconfigured, this technique may be exploitable.

3. Execute Test: Use tools and methods described in the MITRE ATT&CK page and external references below.

Remediation Guide

No specific mitigations documented for this technique.

Detection

Detect Screen Capture via Commands and API Calls

Risk Assessment

CWE Categories

References

• CopyFromScreen .NET
• Antiquated Mac Malware
• Atomic Red Team - T1113
• MITRE ATT&CK - T1113