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Script for Screenshots

Posted on 2011-03-18
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Last Modified: 2012-05-11
Can someone please help me in writing a script which takes screenshots of a remote system. Remote systems can any windows box including Windows XP, 7, 2003 or 2008.
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Question by:Dhiraj Mutha
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by:soostibi
ID: 35169313
The idea came from Alexandair and Shay ( http://www.vistax64.com/powershell/124315-take-screenshot-via-script.html ):
$screen = [System.Windows.Forms.Screen]::PrimaryScreen.Bounds
[reflection.assembly]::LoadWithPartialName("System.Drawing") > $null
$Bitmap = new-object System.Drawing.Bitmap ($screen.width),($screen.height)
$Size = New-object System.Drawing.Size ($screen.width),($screen.height)
$FromImage = [System.Drawing.Graphics]::FromImage($Bitmap)
$FromImage.copyfromscreen(0,0,0,0, $Size,([System.Drawing.CopyPixelOperation]::SourceCopy))
$Bitmap.Save("C:\ee\PrintScreen.png", ([system.drawing.imaging.imageformat]::png))

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by:soostibi
ID: 35169321
And to do this remotely of course you have to call this script via PowerShell remoting:

Invoke-Command -ComputerName PC1 -ScriptBlock $scriptabove
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by:soostibi
ID: 35169408
Sorry, I made some mistakes in the previous comments. So the right solution is this:
$script = {
Add-Type -AssemblyName system.drawing
Add-Type -AssemblyName System.Windows.Forms
$screen = [System.Windows.Forms.Screen]::PrimaryScreen.Bounds
$Bitmap = new-object System.Drawing.Bitmap ($screen.width),($screen.height)
$Size = New-object System.Drawing.Size ($screen.width),($screen.height)
$FromImage = [System.Drawing.Graphics]::FromImage($Bitmap)
$FromImage.copyfromscreen(0,0,0,0, $Size,([System.Drawing.CopyPixelOperation]::SourceCopy))
$Bitmap.Save("C:\ee\PrintScreen2.png", ([system.drawing.imaging.imageformat]::png))
}

Invoke-Command -ComputerName PC1 -ScriptBlock $script

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by:soostibi
ID: 35169433
Well, it seems, that remotely it could not run... Locally it works fine if it runs under a normal user context, but it does not, when it's initiated from a background process. So we have to found a workaround.
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Expert Comment

by:clietech
ID: 35173054
You can use poison ivy or metasploit with a reverce tcp connection you can fall into the shell and do what you want to do take screenshot, run a task etc on a remote computer.
You can develop your ruby scripts to use with a metasploit framework or you can use the scripts in the following link

http://www.metasploit.com/redmine/issues/3255 
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by:soostibi
ID: 35173306
To run my PowerShell script remotely you may use PSExec, I'm still exploring this possibility.
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Author Comment

by:Dhiraj Mutha
ID: 35174266
I dont want to use any third party application. An smal .exe woluld be fine like "capn.exe", but capn doesn't take screenshots of windows 7. Soostibi: i think you script is good, we can work on that, please let me know the final script.
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by:soostibi
ID: 35194504
Unfortunately I can not make it work.

I have this screenshot.BAT file:
powershell.exe -noninteractive -command "&{Add-Type -AssemblyName system.drawing; Add-Type -AssemblyName System.Windows.Forms; $screen = [System.Windows.Forms.Screen]::PrimaryScreen.Bounds; $Bitmap = new-object System.Drawing.Bitmap ($screen.width),($screen.height); $Size = New-object System.Drawing.Size ($screen.width),($screen.height); $FromImage = [System.Drawing.Graphics]::FromImage($Bitmap); $FromImage.copyfromscreen(0,0,0,0, $Size,([System.Drawing.CopyPixelOperation]::SourceCopy)) ; $Bitmap.Save('c:\Remote1.png', ([system.drawing.imaging.imageformat]::png)); Copy-Item -Path C:\remote1.png -Destination '\\DC\c$'}"

And I call PSExec like this from machine DC to take a screenshot from MEMBER1:
C:\PSTools\PsExec.exe \\member1 -i -h -c C:\work\screenshot.bat

It takes the picture, but the png file is actually empty. So PSExec is not interacting with the user environment as it should...
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Expert Comment

by:wls3
ID: 35195102
I am not sure this will work.  Typically you will need to be associated with a particular user session to take a screenshot.  Additionally, the modifications made to the kernel after Vista/2008/7 dissociate the session from the traditional model.  I suspect, even if you find a way to remote to a particular machine, you will not be able to actually acquire the image of a desktop without first initiating a desktop session.  Lastly, since the interactive session option has been nullified in the new kernel, it doesn't seem there would be a workaround without using terminal services or RDP.
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Accepted Solution

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Dhiraj Mutha earned 0 total points
ID: 35212702
Then I think this doesn't resolve my issue....
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Author Closing Comment

by:Dhiraj Mutha
ID: 35357082
This did not resolved my issue.
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