CyberCode Academy

Course 33 - Static Analysis for Reverse Engineering | Episode 3: Graphical Reverse Engineering with x64dbg

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In this lesson, you’ll learn about: graphical static analysis and Control Flow Graphs (CFGs)Review AnswerWhen analyzing a Control Flow Graph (CFG) in x64dbg with the xAnalyzer plugin:🔹 What Green and Red Arrows Represent
  • Green arrows
    • Represent the successful condition (TRUE branch)
    • The path taken when a comparison or condition is met
  • Red arrows
    • Represent the failed condition (FALSE branch)
    • The path taken when the condition is not met
🔹 How They Help in Reverse EngineeringAfter a comparison instruction (like CMP):
  • The program evaluates a condition (e.g., JE, JNE, JG, etc.)
  • The CFG visually splits into:
    • ✅ Green path → correct condition
    • ❌ Red path → incorrect condition
🔹 Practical Use (Cracking / Analysis)These arrows allow you to:
  • Quickly identify:
    • Which branch leads to:
      • “Access Granted”
      • “Access Denied”
  • Focus on:
    • The green path to understand:
      • What makes the input valid
  • Or manipulate:
    • The execution flow (e.g., forcing a jump)
🔹 Simple ExampleAfter a serial key check:
  • If key is correct:
    • → Program follows green arrow
    • → Shows success message
  • If key is wrong:
    • → Program follows red arrow
    • → Shows error message
🎯 Key InsightCFG colors turn complex assembly into a visual decision map:
  • Green = “This condition passed”
  • Red = “This condition failed”
👉 This makes it much easier to:
  • Track logic
  • Identify validation points
  • Reverse engineer faster and smarter


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CyberCode AcademyBy CyberCode Academy