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educationMay 16, 202613:47pending
Course 33 - Static Analysis for Reverse Engineering | Episode 4: Static Analysis and Software Patching in x64dbg
About this episode
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:
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- Analyze program logic without constant execution
- Identify and modify key instructions
- Alter how a program enforces trial limitations
- Search for meaningful strings like:
- "trial period remaining"
- This helps you:
- Jump directly to the function responsible for:
- License checks
- Expiration logic
- Jump directly to the function responsible for:
- Use the graph view (CFG) to:
- Understand decision paths clearly
- Identify key instructions like:
- JG (Jump if Greater)
- A decision gate between:
- Trial still valid
- Trial expired
- 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
- A subtraction between:
- 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
- After modification:
- Save the updated binary
- Run the program
- Confirm:
- Trial duration has increased
- Behavior matches expectations
- 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
- Break down program logic
- Identify control points
- Modify behavior with precision
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