Windows Screen Capture with CopyFromScreen

Status: test
Severity: medium
Log source: category ps_script, product windows
Author: frack113
Source: github.com/SigmaHQ/sigma

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

MITRE ATT&CK coverage

Tactic	Techniques
Collection	`T1113` Screen Capture

Telemetry coverage

Provider	Record / event type
PowerShell	Event ID 4104: Creating Scriptblock text (MessageNumber of MessageTotal).

Rule body

title: Windows Screen Capture with CopyFromScreen
id: d4a11f63-2390-411c-9adf-d791fd152830
status: test
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
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1113/T1113.md#atomic-test-6---windows-screen-capture-copyfromscreen
author: frack113
date: 2021-12-28
modified: 2022-07-07
tags:
    - attack.collection
    - attack.t1113
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        ScriptBlockText|contains: '.CopyFromScreen'
    condition: selection
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    ScriptBlockText|contains: '.CopyFromScreen'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`ScriptBlockText`	match	`.CopyFromScreen` corpus 2 (sigma 1, splunk 1)	`field:"ScriptBlockText" kind:match value:".CopyFromScreen"`