obfuscated-code.md

Obfuscated code

Code	Severity	i18n	Experimental
obfuscated-code	Critical	sast_warnings.obfuscated_code	✔️

Introduction

An experimental warning capable of detecting obfuscation and sometimes the tool used.

JS-X-Ray is capable to detect the following internet tools:

• freejsobfuscator
• jjencode
• jsfuck
• obfuscator.io
• morse
• trojan source

Example of obfuscated code is in the root examples directory.

Technical note

A complete G.Drive document has been written to describe the patterns of obfuscation tools and some way of detecting them:

• JSXRay - Patterns of obfuscated JavaScript code

Caution

This is an early (beta) implementation

Example

The following code uses Morse code to obfuscate its real intent. This was used in an attack and I find it quite funny so i implemented morse detection 😂.

function decodeMorse(morseCode) {
  var ref = {
    '.-': 'a',
    '-...': 'b',
    '-.-.': 'c',
    '-..': 'd',
    '.': 'e',
    '..-.': 'f',
    '--.': 'g',
    '....': 'h',
    '..': 'i',
    '.---': 'j',
    '-.-': 'k',
    '.-..': 'l',
    '--': 'm',
    '-.': 'n',
    '---': 'o',
    '.--.': 'p',
    '--.-': 'q',
    '.-.': 'r',
    '...': 's',
    '-': 't',
    '..-': 'u',
    '...-': 'v',
    '.--': 'w',
    '-..-': 'x',
    '-.--': 'y',
    '--..': 'z',
    '.----': '1',
    '..---': '2',
    '...--': '3',
    '....-': '4',
    '.....': '5',
    '-....': '6',
    '--...': '7',
    '---..': '8',
    '----.': '9',
    '-----': '0',
  };

  return morseCode
    .split('   ')
    .map(a => a.split(' ').map(b => ref[b]).join(''))
    .join(' ');
}

var decoded = decodeMorse(".-- --- .-. -..   .-- --- .-. -..");
console.log(decoded);