Invoke-PSImage v2.0 releases: Embeds a PowerShell script in the pixels of a PNG file

Invoke-PSImage

Embeds a PowerShell script in the pixels of a PNG file and generates a oneliner to execute

Invoke-PSImage takes a PowerShell script and embeds the bytes of the script into the pixels of a PNG image. It generates an oneliner for executing either from a file or from the web.

It can either create a new image using only the payload data, or it can embed the payload in the least significant bytes of an existing image so that it looks like an actual picture. The image is saved as a PNG and can be losslessly compressed without affecting the ability to execute the payload as the data is stored in the colors themselves. When creating new images, normal PowerShell scripts are actually significantly compressed, usually producing a png with a filesize ~50% of the original script.

With the embed method, the least significant 4 bits of 2 color values in each pixel are used to hold the payload. Image quality will suffer as a result, but it still looks decent. It can accept most image types as input, but output will always be a PNG because it needs to be lossless. Each pixel of the image is used to hold one byte of the script, so you will need an image with at least as many pixels as bytes in your script. This is fairly easy—for example, Invoke-Mimikatz fits into a 1920×1200 image.

Changelog v2.0

• New download method with Windows.Forms.PictureBox,
• Added ability to create an image with only payload data.

Download

git clone https://github.com/peewpw/Invoke-PSImage.git

Arguments

-Script [filepath] The path to the script to embed in the Image.

-Image [filepath] The image to embed the script in.

-Out [filepath] The file to save the resulting image to (image will be a PNG)

-Web Output a command for reading the image from the web instead of reading from a file. You will need to host the image and insert the URL into the command.

Example

Create an image with the script “Invoke-Mimikatz.ps1” embedded in it and output a oneliner to execute from disk:

PS>Import-Module .\Invoke-PSImage.ps1
PS>Invoke-PSImage -Script .\Invoke-Mimikatz.ps1 -Out .\evil-kiwi.png -Image .\kiwi.jpg
   [Oneliner to execute from a file]

Create an image with the script “Invoke-Mimikatz.ps1” embedded in it and output a oneliner to execute from the web (you still have to host the image and edit the URL):

PS>Import-Module .\Invoke-PSImage.ps1
PS>Invoke-PSImage -Script .\Invoke-Mimikatz.ps1 -Out .\evil-kiwi.png -Image .\kiwi.jpg -WebRequest
   [Oneliner to execute from the web]

Executing an image hosted on the web: 

Copyright (c) 2017 peewpw

Source: https://github.com/peewpw/