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A stealthier method of loading a .NET PE in memory - via the Assembly.LoadModule method
$Domain = [AppDomain]::CurrentDomain
$DynAssembly = New-Object System.Reflection.AssemblyName('TempAssembly')
$AssemblyBuilder = $Domain.DefineDynamicAssembly($DynAssembly, [Reflection.Emit.AssemblyBuilderAccess]::Run)
$ModuleBuilder = $AssemblyBuilder.DefineDynamicModule('TempModule')
# Create a stub module that the in-memory module (i.e. this mimics the loading of a netmodule at runtime) will be loaded into.
$ModuleBuilder2 = $AssemblyBuilder.DefineDynamicModule('hello.dll')
$TypeBuilder = $ModuleBuilder.DefineType('TempClass', [Reflection.TypeAttributes]::Public)
$TypeBuilder.CreateType()
$HelloDllBytes = [Convert]::FromBase64String('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')
# Calling LoadModule doesn't pass through the internal nLoad method like Assembly/AppDomain.Load does. :)
$HelloDllModule = [TempClass].Assembly.LoadModule('hello.dll', $HelloDllBytes)
# Invoke the Hello method within the hello.dll module that was loaded in memory
$HelloDllModule.GetTypes()[0].GetMethod('Hello').Invoke($null, @())
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