How does JavaScript obfuscation work?

19

I would like to know how this business "obfuscates" a JavaScript code.

For example, there is an online service on a site that "obfuscates" the code on time. Just paste your code and it returns the whole "obfuscated" code:

Simple code example:

console.log("Olá mundo!");

It is returned:

var _0x6b39=["\x4F\x6C\xE1\x20\x6D\x75\x6E\x64\x6F\x21","\x6C\x6F\x67"];console[_0x6b39[1]](_0x6b39[0])

And it works quietly (run the snippet below):

var _0x6b39=["\x4F\x6C\xE1\x20\x6D\x75\x6E\x64\x6F\x21","\x6C\x6F\x67"];console[_0x6b39[1]](_0x6b39[0])

What kind of algorithm or system is used to convert the code into a tangle of characters, letters, and numbers? How does this work?

The site in question is this link .

    
asked by anonymous 02.11.2017 / 03:19

2 answers

23

This is not encryption. This is just hexadecimal (Base16), just like any other encoding, such as Base64, Base32, Base91 ...

If you make one:

fmt.Println(hex.EncodeToString([]byte("Olá mundo!")))

You will have exactly:

4f6cc3a1206d756e646f21

As you can see here . For Javascript to "interpret" hexadecimal as a string you use \x , normally the languages use 0xHH or \xHH , other standards exist, these two I believe are the most common.

Using Javascript itself, you can do this:

function toHex(str) {
    var result = '';
    for (var i=0; i<str.length; i++) {
        result += str.charCodeAt(i).toString(16);
    }
    return result;
}

Font.

Then you can do:

"\x" + toHex('Olá Mundo!').match(/.{2}/g).join("\x");

As a result you will have:

\x4f\x6c\xe1\x20\x6d\x75\x6e\x64\x6f\x21

Obviously this is totally reversible, so much so that content is shown in alert() .

There are other obfuscation techniques, such as JSFuck , where the same alert() would become:

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But clearly all these methods are reversible. The renaming of variables is just to make it difficult to read, making it less understandable.

    
02.11.2017 / 03:35
13

The \x only indicates the caratere to be presented in hexadecimal format and corresponding to the ASCII table.

From the documentation :

  

\ xXX the Latin-1 character

If we have \x61 , we can look at the ASCII table:

Dec Hex Bin         Letra
97  61  01100001    a    
98  62  01100010    b    
99  63  01100011    c    
100 64  01100100    d    
101 65  01100101    e    
102 66  01100110    f    
103 67  01100111    g

And see that it corresponds to the letter a which is what has 61 in the Hex column.

let letra = "\x61";
console.log(letra);

This in itself is not encryption, but a less readable way to define the text of a string.

By analyzing the referenced site, you converted from:

function NewObject(prefix)
{
    var count=0;
    this.SayHello=function(msg)
    {
          count++;
          alert(prefix+msg);
    }
    this.GetCount=function()
    {
          return count;
    }
}
var obj=new NewObject("Message : ");
obj.SayHello("You are welcome.");

To:

var _0xd439=["\x53\x61\x79\x48\x65\x6C\x6C\x6F","\x47\x65\x74\x43\x6F\x75\x6E\x74","\x4D\x65\x73\x73\x61\x67\x65\x20\x3A\x20","\x59\x6F\x75\x20\x61\x72\x65\x20\x77\x65\x6C\x63\x6F\x6D\x65\x2E"];function NewObject(_0xcd7ax2){var _0xcd7ax3=0;this[_0xd439[0]]= function(_0xcd7ax4){_0xcd7ax3++;alert(_0xcd7ax2+ _0xcd7ax4)};this[_0xd439[1]]= function(){return _0xcd7ax3}}var obj= new NewObject(_0xd439[2]);obj.SayHello(_0xd439[3])

We see that the first thing you do is to create an array with all the strings used with the hexadecimal encoding to be hard to read:

var _0xd439=["\x53\x61\x79\x48\x65\x6C\x6C\x6F","\x47\x65\x74\x43\x6F\x75\x6E\x74","\x4D\x65\x73\x73\x61\x67\x65\x20\x3A\x20","\x59\x6F\x75\x20\x61\x72\x65\x20\x77\x65\x6C\x63\x6F\x6D\x65\x2E"];

console.log(_0xd439);

Then each time you need to use one of the texts access the corresponding position in the array:

SayHello(_0xd439[3])

We also see that variable names have been changed to make readability difficult, such as _0xd439 in the code line presented above. The array of names was also used by the program to define its own names of functions as SayHello or GetCount :

this[_0xd439[1]]= function(){return _0xcd7ax3} 

Where _0xd439[1] has GetCount , which corresponds to have done:

this["GetCount"] = function(){return _0xcd7ax3} 
    
02.11.2017 / 03:43