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REVERSE ENGINEERING
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AGENDA

Lab 0 : Reversing an ARM binary
 Find the patch logic using GDB
 Using Ghidra and Hopper to understand ARM binaries.

Lab 1: Reversing an ARM binary
 Find the patch logic using GDB.
 Create a patch and run in GDB.
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REVERSING BINARY : LAB1
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REVERSE ENGINEERING : GDB

Reverse engineer binary ‘rev1’ to print “Yes, xx is correct” by
giving any value in input.
gcc -o rev1 rev1.c
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REVERSE ENGINEERING : GDB

Step 1 : Learn about the binary type.
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REVERSE ENGINEERING : GDB

Step 2 : Disassemble the binary
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REVERSE ENGINEERING : GDB

Step 3 : Run the binary
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REVERSE ENGINEERING : GDB

Step 4 : Inspect assembly in GDB/Ghidra/Hopper/BinaryNinja

Step 5 : Find the patch logic

Step 6 : Create a patched file
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REVERSING BINARY : LAB2
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REVERSE ENGINEERING :
GHIDRA

Reverse engineer binary ‘challenge1’ and understand the
program logic.

Find the patch logic to print “You won !!” by giving any arbitrary
value as input.

Create a patched binary using Ghidra/Hopper/BinaryNinja.
Note:
Ghidra Commands
https://ghidra-sre.org/CheatSheet.html
Patching Ghidra
https://materials.rangeforce.com/tutorial/2020/04/12/Patching-Binaries/
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HOMEWORK 3
[EASY] (3 marks)
Crack the binary rev2 and generate a patched version as rev2_patched. Explain the
logic of the password by creating the code rev2.c.
[NOT EASY] (2 marks).
Crack the binary challenge2 by reverse engineering and explain a way to print
"Access granted enjoy".
[HARD](bonus 1 mark)
Crack the binary challenge2 and generate a patched version as
challenge2_patched to print "Access granted enjoy" on giving any arbitrary inputs.
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Questions
Reverse Engineering