Running a .NET Assembly in Memory with Meterpreter

In this blog post I will discuss leveraging Meterpreter’s powershell module to execute .NET assemblies in-memory. Metasploit and Meterpreter are effective and useful tools, but occasionally one encounters a situation where they lack features. Cobalt Strike (a different Command and Control framework) contains an execute-assembly command providing in-memory .NET execution for situations where it lacks built in commands. Meterpreter contains the features required to perform the same behavior, albeit slightly less polished.