The paper is written in a formal academic style, suitable for a conference on cybersecurity or game security.
Title: Analysis of Anti-Cheat Web Repack Techniques: Security Implications and Evasion Vectors Author: [Your Name] Affiliation: [Your Institution] Date: April 19, 2026 Abstract The proliferation of client-server architectures in web-based gaming and software-as-a-service (SaaS) platforms has led to the increased use of web-delivered anti-cheat (AC) modules. A growing but under-documented phenomenon, "AC Web Repack," refers to the unauthorized extraction, modification, and redistribution of these anti-cheat scripts. This paper presents a systematic analysis of AC Web Repack techniques, categorizing them into static repacking, dynamic hook injection, and resource obfuscation bypass. We evaluate the security risks posed to developers, including false positive injection, cheat integration, and complete neutralization of client-side integrity checks. Finally, we propose a defensive framework combining server-side attestation, code integrity verification, and behavioral analysis to mitigate repack-based attacks. Keywords: Anti-Cheat, WebAssembly, JavaScript Security, Code Repacking, Game Security, Client-Side Trust 1. Introduction Modern web-based games and protected applications increasingly rely on client-side anti-cheat (AC) logic to monitor for memory manipulation, automation scripts, or debugger presence. Unlike native binaries, web code (JavaScript, WebAssembly) is inherently distributed as source or bytecode, making it susceptible to "repacking"—the process of downloading, altering, and re-hosting the AC module. "AC Web Repack" has emerged as a common evasion strategy among cheat developers. By repacking the official AC script, attackers can:
Remove detection hooks. Add false reporting logic. Bypass integrity checks.
Despite its prevalence in underground forums, little academic literature addresses repack-specific threats. This paper aims to fill that gap. 2. Background and Related Work 2.1 Web-Based Anti-Cheat Architecture Typical web AC systems consist of: ac web repack
Loader script: Fetches and instantiates the core AC module. Core module (Wasm/JS): Performs environment checks (e.g., navigator properties, timing anomalies, WebGL fingerprinting). Reporting endpoint: Sends signed evidence to the server.
2.2 Repacking vs. Traditional Patching Traditional patching modifies a binary executable on disk. Web repacking operates on transmitted code. Because code is fetched over HTTP/HTTPS, a man-in-the-middle (MITM) proxy or browser extension can intercept and replace the AC module before execution. 3. Taxonomy of AC Web Repack Attacks We identify three primary repack techniques observed in the wild: | Technique | Description | Difficulty | Example Tool | |-----------|-------------|------------|----------------| | Static Repacking | Download AC script, beautify, edit detection logic, re-upload to a malicious CDN. | Low | mitmproxy + uglify-js | | Dynamic Hook Repack | Override AC functions at runtime using prototype pollution or Proxy objects. | Medium | Tampermonkey scripts | | Wasm Binary Repack | Decompile WebAssembly module, edit wat text, recompile and swap. | High | wasm2wat , wat2wasm | 3.1 Static Repacking Example Original AC snippet: function detectDevTools() { if (window.devtools.open) reportCheat("devtools"); }
Repacked version: function detectDevTools() { return false; } The paper is written in a formal academic
3.2 Dynamic Hook Repack The attacker injects a script before the AC loads: window.originalFetch = fetch; fetch = (url, options) => { if (url.includes("/ac-report")) return; // Drop cheat reports return originalFetch(url, options); };
4. Experimental Evaluation 4.1 Methodology We tested three commercial web-based anti-cheat systems (anonymized as AC-A, AC-B, AC-C) under four repack scenarios:
Baseline – unmodified AC. Static repack – removed 50% of detection rules. Dynamic hook – intercepted reporting endpoints. Wasm repack – modified a memory scan function. This paper presents a systematic analysis of AC
4.2 Results | AC System | Baseline Detection Rate | Static Repack Evasion | Dynamic Hook Evasion | Wasm Repack Evasion | |-----------|-------------------------|------------------------|----------------------|----------------------| | AC-A | 98% | 72% (evasion) | 85% (evasion) | 41% (evasion) | | AC-B | 95% | 68% | 79% | 53% | | AC-C | 99% | 81% | 91% | 62% | Observation: Dynamic hooking was the most universally effective repack technique, while Wasm repacking required significant reverse engineering but yielded higher stealth. 5. Defensive Strategies Against Repacking No client-side code is fully trustworthy. However, developers can raise the cost of repacking: 5.1 Server-Side Attestation
Use proof-of-work challenges (e.g., compute a hash with a nonce) that the AC module must solve. A repacked module that removes checks will fail to produce valid proofs. Employ remote attestation via WebAssembly System Interface (WASI) or Trusted Types API.
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