A Managed Code Rootkit (MCR) is a special type of malicious code that is deployed inside an application level virtual machine such as those employed in managed code environment frameworks – Java, .NET, Dalvik, Python, etc. Having the full control of the managed code VM allows the MCR to lie to the upper level application running on top of it, and manipulate the application behavior to perform tasks not indented originally by the software developer. ReFrameworker is a general purpose Framework modifier, used to reconstruct framework Runtimes by creating modified versions from the original implementation that was provided by the framework vendor. ReFrameworker performs the required steps of runtime manipulation by tampering with the binaries containing the framework’s classes, in order to produce modified binaries that can replace the original ones. It was developed to experiment with and demonstrate deployment of MCR (Managed Code Rootkits) code into a given framework.Read more: AppSec