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Thread: change variable in SWF with PHP

  1. #21
    Junior Member
    Join Date
    Aug 2004
    Posts
    9
    Quote Originally Posted by Musicman View Post
    Basic action format - inside an actions tag - is either one byte (values in the 1-127 range), or one byte (values in the 128-255 range), followed by two length bytes, followed by data. Looking at simple example, you would need to handle at least geturl, loadvariables, push, and constants.

    Musicman
    I don't understand exactly how is this, I tryed to take the data direct on your function:

    PHP Code:
    function readtag()
        {    
    $this->bufbits=1;
            
    $this->buffer=0;
            
    $res=new object();
            
    $buf=fread($this->fp2);
            
    $res->tag=$buf;     
            
    $tmp=unpack("vx"$buf);
            
    $val=$tmp["x"];
            
    $res->type=$val >> 6;
            
    $res->nbytes=$val 63;
            if(
    $res->nbytes == 63)
            {    
    $buf=fread($this->fp4);
                
    $res->tag.=$buf;
                
    $tmp=unpack("Vx"$buf);
                
    $res->nbytes=$tmp["x"];
            }                          
            if (
    $res->type==12) {
            while (
    $res->nbytes>$this->bufbits) {
                
    $data['tag']=fread($this->fp1);
                
    $this->bufbits+=1;
                
    $buf=fread($this->fp2);
                
    $this->bufbits+=2;
                
    $data['tag'].=$buf;
                
    $tmp=unpack("v"$buf);
                
    $data['bytes']=$tmp[1];
                if (
    $data['bytes']) $data['data']=fread($this->fp$data['bytes']);
                
    $this->bufbits+=$data['bytes'];
                
    $data['end']=fread($this->fp1);
                
    $this->bufbits+=1;
                
    $res->data[]=$data;
            }
                
    $res->end=fread($this->fp1);
            }
            elseif (
    $res->nbytes)
              
    $res->data=fread($this->fp$res->nbytes);
            return 
    $res;
        } 
    But don't work allways, have problems to read lengths inside an actions tag for each action.

    I need to replace the name of variables and functions to obfuscate the swf files, have many swf files cannot use Flash program for this becouse is very hard.

  2. #22
    Junior Member
    Join Date
    Aug 2004
    Posts
    9
    Please, do you want to help Musicman? I am sure for you is very easy what I need.

    Thanks

    Finally I find a solution to obfuscate the swf file and I will put here when wil be made.
    Last edited by saschart; 06-03-2009 at 10:20 AM.

  3. #23
    Registered User
    Join Date
    Feb 2001
    Posts
    13,044
    Hi,

    obfuscation is a different beast, because you can keep the length of variable names; so nothing but those names would change.
    Note that strings (variable names) are always terminated by a 0 byte - in many (but not all) cases they are also preceded by a 0 byte. It might help to ensure that varnames that could be trailing substrings of others are replaced by new names with the same property. Do you plan to build / provide a list of names that should be replaced?

    Musicman

  4. #24
    Junior Member
    Join Date
    Aug 2004
    Posts
    9
    I need replacing from a variables/functions names list, here is the a part of the code which I write:

    PHP Code:
      $out=$res=$tag=$tags=array();
      
    $arr_act=array(12,59);

      while(
    $swfdata) {
        unset(
    $res);
        
    $buf=readData(2);
        
    $res['tag']=$buf;
        
    $tmp=unpack("v"$buf);
        
    $val=$tmp[1];
        
    $res['type']=$val >> 6;
        
    $res['bytes']=$val 63;
        if(
    $res['bytes'] == 63) {
          
    $buf=readData(4);
          
    $res['tag'].=$buf;
          
    $tmp=unpack("V"$buf);
          
    $res['bytes']=$tmp[1];
        }
        if (
    in_array($res['type'],$arr_act)) {
          
    $pos=1;
          unset(
    $tags);
          
    $bsize=0;
          if (
    $res['type']==59) {
            
    $res['sprite']=readData(2);
            
    $pos+=2;
          }
          while (
    $res['bytes']>$pos) {
            unset(
    $tag);
            
    $buf=readData(1);
            
    $tag['tag']=$buf;
            
    $pos+=1;
            
    $tag['id']=bin2hex($buf);
            if (
    $buf >= chr(0x80)) {
              
    $buf=readData(2);
              
    $pos+=2;
              
    $tmp=unpack("v"$buf);
              
    $tag['bytes']=$tmp[1];
              if (
    $tag['bytes']) {
                
    $tag['data']=readData($tag['bytes']);
                
    $tmp=str_replace($arr_find,$arr_repl,$tag['data']);
                
    $csize=strlen($tmp)-strlen($tag['data']);
                if (
    $tag['data']<>$tmp) {
                  
    $tag['bytes']+=$csize;
                  
    $bsize+=$csize;
                  
    $tag['data']=$tmp;
                  echo 
    "change data in tag ".$res['type']." subtag ".$tag['id']."<br>";
                }
              }
              
    $pos+=$tag['bytes'];
              
    $rettag.=$tag['tag'].pack("v"$tag['bytes']).$tag['data'];
            }
            else
              
    $rettag.=$tag['tag'];
            
    $tags[]=$tag;
          }
          
    $res['data']=$tags;
          
    $res['end']=readData(1);
          
    $outswf.=putTag($res['type'], ($res['bytes']+$bsize), strlen($res['tag'])).$res['sprite'].$rettag.$res['end'];
          
    $asize+=$bsize;
        }
        elseif (
    $res['bytes']) {
          
    $res['data']=readData($res['bytes']);
          
    $tmp=str_replace($arr_find,$arr_repl,$res['data']);
          
    $bsize=strlen($tmp)-strlen($res['data']);
          if (
    $bsize) {
            echo 
    "warning: you cannot change the length of {".$res['type']."} tag type<br>";
            return;
          }
          if (
    $res['data']<>$tmp) {
            
    $res['data']=$tmp;
            echo 
    "change data in tag ".$res['type']."<br>";
          }
          
    $outswf.=putTag($res['type'], ($res['bytes']+$bsize), strlen($res['tag'])).$res['data'];
          
    $asize+=$bsize;
        }
        else {
          
    $outswf.=$res['tag'];
        }
        
    $out[]=$res;
      }
      
    print_r($out); 
    For who need I upload one example of swf obfuscator with variables/functions names replacing is to http://soft.saschart.com/#SWF%20Obfuscator

    Thanks

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