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how to decrypt and decode png files to real file (.ass)

(http://stream-recorder.com/forum/showthread.php?t=16727)

Liluy

03-25-2015 01:02 PM

Re: how to decrypt and decode png files to real file (.ass)

New ADN protection.
AES in multibu greatly changed.

Legremlins_Keitaro

03-25-2015 01:37 PM

Re: how to decrypt and decode png files to real file (.ass)

Nothing change, AES is still the same, no difference between september 2014 multibu and march 2015 multibu in the AES function.

But yes, protection change, and now they can block IP to get subtitle => you can show the video but not the subtitle.

blurg

03-26-2015 07:00 AM

Re: how to decrypt and decode png files to real file (.ass)

they are another protection inside swf

aes.as (base script)
and aes_constantes.as (new script)

and a few ligne in aes.as script are change
(exemple ligne 147 to 171)

Liluy

03-26-2015 10:25 AM

Re: how to decrypt and decode png files to real file (.ass)

2 Attachment(s)

Yes, if you want to see the difference between the old and the new here.

AES constantes :
package com.longtailvideo.plugins.mulutibu6
{
import mx.core.ByteArrayAsset;

public class AES_Constantes extends ByteArrayAsset
{

public function AES_Constantes()
{
super();
}
}
}

and

public static function d(param1:String, param2:int, param3:int = 63) : String
{

The number after param3: int = changes every day

KSV	03-26-2015 12:59 PM

Re: how to decrypt and decode png files to real file (.ass)

it was just a minor change in key retrieval. rest of the algorithm is still same. i will push the update to my repository soon.

KSV	03-26-2015 01:21 PM

Re: how to decrypt and decode png files to real file (.ass)

update pushed to the repository. if they only change third parameter on rotational basis then you can update the $start variable to new one to decrypt successfully. if someone can confirm that they don't change AES constants regularly then script can be further refined to work without requiring any changes at all. i have tested this script on this file.

Liluy

03-26-2015 01:27 PM

Re: how to decrypt and decode png files to real file (.ass)

Thanks you ! KSV !
It works perfectly !

blurg

03-26-2015 02:17 PM

Re: how to decrypt and decode png files to real file (.ass)

1 Attachment(s)

thx KSV you're the best

but i have just a question about the key in your update script

Code:

 $key = substr("eab023e7fdc6e8c6908e116bc550aa7099d46f866436c5a763b0fbfb73a23eceb8d313f7722af47d4530bdbd96d970d8821d0707d284b585ff5"....

how do you have this because the ligne 135 in aes.as change everyday too

03/27/2015 00H20
the new mulutibu swf

doesn't work even when i change $start variable

KSV	03-27-2015 12:53 AM

Re: how to decrypt and decode png files to real file (.ass)

aes constants are embedded as binary data in swf file. you just have to get the new constants and starting number from updated swf file. i have amended the previous commit so you can directly copy paste that data with minimal changes (replace '0x' with '\x') into script.

gaaara

03-27-2015 06:47 AM

Re: how to decrypt and decode png files to real file (.ass)

how to get this information automatically with a script ? exemple denobis script

Code:

<?php



//get the encryption key

$swf=file_get_contents("mulutibu_v4_3.swf");

$swf        = bin2hex(gzuncompress(substr($swf,8)));

        if (!strpos($swf,"62052404d3a215d3ffff620848")) die("bad");

        

                $iv=explode("24",explode("5620",explode("d030",explode("62052404d3a215d3ffff620848",$swf)[1])[1])[0]);

                

                $key1="";

                

                foreach ($iv as $c)

                        {

                        $actual=chr(hexdec(substr($c,0,2)));

                        $key1.=$actual;

                        if (strlen($c)>2)

                                $key1.=$actual;                                                        

                        }



echo "\r\nivkey:".trim($key1);

        echo "\r\nThe key is in the file adnivkey.txt";

                file_put_contents("adnivkey.txt", trim($key1));



?>

and how to décompile swf files on linux

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