[{"_1":2,"_33":-5,"_34":-5},"loaderData",{"_3":4},"routes/challenges.$slug",{"_5":6},"challenge",{"_7":8,"_9":10,"_11":12,"_13":14,"_15":16,"_17":18,"_19":20,"_21":22,"_23":24,"_30":31},"slug","polyglot","name","Polyglot","category","Malware Reverse Engineering","description","A suspicious file was recovered during an investigation involving an unknown execution chain. Initial analysis shows that the same artifact behaves differently depending on how it is interpreted by various runtimes, each revealing only part of the overall logic. Your task is to analyze both execution paths, understand how they interact, and recover the hidden data produced across them. Flag format: flag{...}","descriptionHtml","

A suspicious file was recovered during an investigation involving an unknown execution chain. Initial analysis shows that the same artifact behaves differently depending on how it is interpreted by various runtimes, each revealing only part of the overall logic.

Your task is to analyze both execution paths, understand how they interact, and recover the hidden data produced across them.

Flag format: flag{...}

","labDetails","Prerequisites & Requirements Intermediate Python Proficiency: A solid understanding of Python syntax, execution flow, and common data manipulation techniques, including eval, exec, and Base64 decoding. Intermediate JavaScript Proficiency: A strong grasp of JavaScript syntax, labeled statements, and browser environment concepts, particularly eval and Buffer operations. Basic Polyglot Concepts: A foundational understanding of how a single file can be validly interpreted by multiple language interpreters, exploiting syntax differences. Basic Cryptographic Awareness: Familiarity with fundamental cryptographic operations, especially XOR, and common encoding schemes like Base64. What will you learn? Analyze Polyglot Files: Understand the principles and execution mechanisms of polyglot files designed to run differently across multiple programming languages ( e.g ., Python and JavaScript). Deobfuscate Multi-Language Payloads: Develop skills in identifying and deobfuscating code segments within a single file that are specifically crafted for execution in distinct environments. Reconstruct Custom Decryption Algorithms: Learn to reverse engineer and implement custom mathematical and XOR-based decryption logic to recover hidden data from obfuscated code. Tools CyberChef: A versatile web-based utility for various data transformations, including Base64 decoding and general string manipulation. Python Interpreter: For executing and debugging the Python-specific sections of the polyglot file and custom decryption scripts.","labDetailsHtml","

Prerequisites & Requirements

Intermediate Python Proficiency: A solid understanding of Python syntax, execution flow, and common data manipulation techniques, including eval, exec, and Base64 decoding.
Intermediate JavaScript Proficiency: A strong grasp of JavaScript syntax, labeled statements, and browser environment concepts, particularly eval and Buffer operations.
Basic Polyglot Concepts: A foundational understanding of how a single file can be validly interpreted by multiple language interpreters, exploiting syntax differences.
Basic Cryptographic Awareness: Familiarity with fundamental cryptographic operations, especially XOR, and common encoding schemes like Base64.

What will you learn?

Analyze Polyglot Files: Understand the principles and execution mechanisms of polyglot files designed to run differently across multiple programming languages ( \n e.g\n ., Python and JavaScript).
Deobfuscate Multi-Language Payloads: Develop skills in identifying and deobfuscating code segments within a single file that are specifically crafted for execution in distinct environments.
Reconstruct Custom Decryption Algorithms: Learn to reverse engineer and implement custom mathematical and XOR-based decryption logic to recover hidden data from obfuscated code.

Tools

CyberChef: A versatile web-based utility for various data transformations, including Base64 decoding and general string manipulation.
Python Interpreter: For executing and debugging the Python-specific sections of the polyglot file and custom decryption scripts.

","level","Medium","tags",[25,26,27,28,29],"Obfuscation","Static Analysis","Code Flow","Strings","Cryptor","jobPositions",[32],"Malware Analyst","actionData","errors"]

Polyglot

Overview

Job Positions

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