How does code obfuscation work in Javascript?

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23

I wonder, how does this business of "obfuscate" a Javascript code.

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

Simple example of code:

console.log("Olá mundo!");

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 smoothly (run the snippet down 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 code into a jumble of characters, letters and numbers? How does this work?

The site in question is this link.

2 answers

30


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

If you make a:

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

You will have exactly:

4f6cc3a1206d756e646f21

As you can see here. In order for Javascript to "interpret" the hexadecimal as a string you use the \x, usually the languages use 0xHH or \xHH, other standards exist, these two 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;
}

Source.

Then you can do:

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

As a result will:

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

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


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

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But clearly all these methods are reversible. Renaming the variables is only to make it difficult to read, making it less understandable.

  • 4

    Any answer that uses Jsfuck deserves a +1.

17

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

Of 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 matches the letter a which is what you have 61 in the column Hex.

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

Which in itself is not encryption, but a less readable way of defining the text of a string.


Analyzing the referred site, which 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 it does is to create an array of all the strings used with hexadecimal encoding to be difficult 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 the names of the variables were changed to make it difficult to read, such as the _0xd439 in the source line previously displayed. The array of names was also used by the program to define the function names themselves as SayHello or GetCount:

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

In which _0xd439[1] has GetCount, what I would have done:

this["GetCount"] = function(){return _0xcd7ax3} 

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