# Course 33 - Static Analysis for Reverse Engineering | Episode 4: Static Analysis and Software Patching in x64dbg

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Podcast: [CyberCode Academy](https://stenobird.com/podcast/cybercode-academy-7578615)
Published: 2026-05-16T06:00:03+00:00
Episode link: https://www.spreaker.com/episode/course-33-static-analysis-for-reverse-engineering-episode-4-static-analysis-and-software-patching-in-x64dbg--71927845
Audio file: https://dts.podtrac.com/redirect.mp3/api.spreaker.com/download/episode/71927845/patching_software_trial_logic_with_x64dbg.mp3
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Duration seconds: 827

## Resource

In this lesson, you’ll learn about: applying static analysis and patching to modify software behavior1. Core ConceptThis episode demonstrates how to use x64dbg with the xAnalyzer plugin to: Analyze program logic without constant execution Identify and modify key instructions Alter how a program enforces trial limitations 2. Locating Critical Logic Search for meaningful strings like: "trial period remaining" This helps you: Jump directly to the function responsible for: License checks Expiration logic 3. Visualizing Program Flow Use the graph view (CFG) to: Understand decision paths clearly Identify key instructions like: JG (Jump if Greater) 👉 This instruction acts as: A decision gate between: Trial still valid Trial expired 4. Understanding the Logic Behind the Trial The program calculates remaining time using: A fixed value (e.g., 1E in hex = 30 days) It performs: A subtraction between: Current date Allowed trial duration 5. The Patching Idea (High-Level) Instead of changing logic flow, the approach modifies: The data value controlling the limit Example concept: Increasing the maximum allowed duration Results in a longer trial period 6. Validation Step After modification: Save the updated binary Run the program Confirm: Trial duration has increased Behavior matches expectations Key Takeaways Static analysis helps you pinpoint critical logic CFG visualization simplifies complex branching decisions Trial systems often rely on: Simple arithmetic checks Small changes in values can significantly affect behavior Always verify changes through testing Big PictureThis workflow shows how reverse engineers: Break down program logic Identify control points Modify behavior with precision You can listen and download our episodes for free on more than 10 different platforms: https:…

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