Smbexec is a tool that you can use for penetration testing domain controllers; the program allows running post exploitation for domain accounts and expanding the access to targeted network. This gives pentesters full access without any privilege requirement.
Latest release includes improvements so it runs faster and there are more options in configuration and a module that support file search. Using smbexec allows easily going through all machines on the network and collecting the necessary information such as the UAC configuration or other system settings beside where the domain administrators’ credentials are in use.
Read more here – http://www.sectechno.com/2014/03/30/smbexec-rapid-post-exploitation-tool/