Module: Msf::Payload::Windows::Exitfunk_x64

Included in:
BindNamedPipe_x64, BindTcp_x64, ReverseHttp_x64, ReverseNamedPipe_x64, ReverseTcp_x64
Defined in:
lib/msf/core/payload/windows/x64/exitfunk.rb

Overview

Implements arbitrary exit routines for Windows ARCH_X64 payloads

Instance Method Summary collapse

Instance Method Details

#asm_exitfunk(opts = {}) ⇒ Object


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# File 'lib/msf/core/payload/windows/x64/exitfunk.rb', line 16

def asm_exitfunk(opts={})

  asm = %Q^
    exitfunk:
      pop rax               ; won't be returning, realign the stack with a pop
  ^

  case opts[:exitfunk]

  when 'seh'
    asm << %Q^
      push 0                ;
      pop rcx               ; set the exit function parameter
      mov ebx, 0x#{Msf::Payload::Windows.exit_types['seh'].to_s(16)}
      mov r10d, ebx         ; place the correct EXITFUNK into r10d
      call rbp              ; SetUnhandledExceptionFilter(0)
      push 0                ;
      ret                   ; Return to NULL (crash)
    ^

  when 'thread'
    asm << %Q^
      push 0                ;
      pop rcx               ; set the exit function parameter
      mov ebx, 0x#{Msf::Payload::Windows.exit_types['thread'].to_s(16)}
      mov r10d, ebx         ; place the correct EXITFUNK into r10d
      call rbp              ; call EXITFUNK( 0 );
    ^

  when 'process', nil
    asm << %Q^
      push 0                ;
      pop rcx               ; set the exit function parameter
      mov r10, #{Rex::Text.block_api_hash('kernel32.dll', 'ExitProcess')}
      call rbp              ; ExitProcess(0)
    ^

  when 'sleep'
    asm << %Q^
      push 300000           ; 300 seconds
      pop rcx               ; set the sleep function parameter
      mov r10, #{Rex::Text.block_api_hash('kernel32.dll', 'Sleep')}
      call rbp              ; Sleep(30000)
      jmp exitfunk          ; repeat
    ^

  else
    # Do nothing and continue after the end of the shellcode
  end

  asm
end