![]() ![]() ![]() Regex reg1 = new Regex("(var |function |\\.prototype\\.)( )") Static string files1 string, StringSplitOptions.RemoveEmptyEntries) įile.AppendAllText(dest1, File.ReadAllText(src "\\" s) Environment.NewLine Environment.NewLine Environment.NewLine Environment.NewLine Environment.NewLine Environment.NewLine, Encoding.UTF8) Enjoy: static Dictionary names = new Dictionary() Ended up writing my own obfuscator using regular expressions. After that, we can paste some source code into the window and inspect the generated AST on the right-hand side.Tested 8 different obfuscators (except and was amazed by how much they all suck. In this case, we would select Javascript as the programming language and as the parser. It allows you to choose a programming language and parser. To help us with that, we will leverage an online tool: .ĪST Explorer serves as an interactive AST playground. When deobfuscating Javascript, I typically follow this workflow:īefore we can write any plugins for a deobfuscator, we should always first visualize the code’s AST. I’ll be using an unobfuscated piece of code as an example. It will only detail the general process of analyzing source code. This section will not discuss any practical deobfuscation techniques. The code generation phase takes in the final AST and converts it back to executable Javascript. This stage will be the main focus of future tutorials. All the deobfuscation transformations we write are executed in this stage. During this phase, Babel takes the generated AST and traverses it to add, update, or remove nodes. The transformation phase is the most important phase. You can read more about the parsing phase here: To parse code into an AST, we make use of The following is an example of parsing code from a file, sourcecode.js: 1Ĭonst parser = require( code = fs. Two stages of parsing are Lexical Analysis and Syntactic Analysis. I’ll give you a (very) short summary of each of these phases: Stages of Babel Phase #1: Parsingĭuring this phase, Babel takes source code as an input and outputs an AST. Into something incomprehensible to humans: 1įunction _0x57e2( _0x23db1e, _0x36111b). ![]() ReCAPTCHA, Shape Security, PerimeterX, Akamai, DataDome)įor example, the obfuscation process can convert this human-readable script: 1 To enhance security, i.e obscuring the logic behind javascript-based challenges or fingerprinting (e.g.To make it harder to modify, debug, or reproduce (e.g.Code authors may choose to obfuscate their code for many reasons, including but not limited to: Obfuscation is a series of code transformations that turn human-readable code into something that is deliberately difficult for a human to understand, while (for the most part) still maintaining its original functionality. ![]() Rather, this post serves as a brief overview of the state of Javascript obfuscation, different methods of analysis, and provides resources to learn more about reverse engineering Javascript. I won’t be going in-depth regarding practical deobfuscation techniques that’ll be reserved for later articles. Welcome to the first article in my series about Javascript deobfuscation. ![]()
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