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Title: win32/xp pro Sp3 (EN) 32-bit - Beep Beep Shell Code.
Description:On execution a Beep will occur with an interval of 20 seconds.
Author: Debasish Mandal
Blog : http://www.debasish.in/
Tested on: WinXP Pro SP3 (EN) 32bit.
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Hardcoded opcodes (kernel32.Beep and Kernel32.Sleep)
Win32 API Used:
BOOL WINAPI Beep(
__in  DWORD dwFreq,
__in  DWORD dwDuration
);
  AND
VOID WINAPI Sleep(
__in  DWORD dwMilliseconds
);
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Assembly Code!
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;Beep.asm
[SECTION .text]

global _start
 
_start:
  mov ecx,5                   ; Loop
loop:
  xor eax,eax
  xor ebx,ebx
  xor ecx,ecx
  xor edx,edx

 
  mov eax, 0x7c837aa7 ;address of Beep
  mov bx, 750         ;Frequency
  mov dx, 50          ;Duration 
  push ebx
  push edx
  call eax            ;Call Beep
 
  xor eax,eax
  xor ebx,ebx
  mov ebx, 0x7c802446 ;address of Sleep
  mov ax, 20000       ;pause for 20 Seconds
  push eax
  call ebx            
 
  dec ecx
jnz loop

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Testing the Code!
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/*shellcodetest.c*/
 
char code[] = "\x31\xc0
\x31\xdb
\x31\xc9
\x31\xd2
\xb8\xa7\x7a\x83\x7c
\x66\xbb\xee\x02
\x66\xba\x32\x00
\x53
\x52
\xff\xd0
\x31\xc0
\x31\xdb
\xbb 46\x24\x80\x7c
\x66\xb8\xe8\x03
\x50
\xff\xd3
\x49
\x75\xd4
\x31\xc0
\xb8\x12\xcb\x81\x7c
\x50
\xff\xd0";
int main(int argc, char **argv)
{
  int (*func)();
  func = (int (*)()) code;
  (int)(*func)();
}