This document provides an introduction to reverse engineering basics. It discusses that reverse engineering involves analyzing a binary or executable to understand the underlying source code. It outlines tools used like debuggers to examine running programs, disassemblers to translate machine code to assembly, and decompilers to translate to high-level source code. The document explains that reverse engineering requires knowledge of operating systems, programming languages, and assembly. It also lists domains that benefit from reverse engineering like malware analysis, software cracking, and exploit development.

1. REVERSE
ENGINEERING BASICS
BY PRASENJIT KANTI PAL

2. WHOAMI
• Information Security Enthusiast
• Blessed to follow my passion as profession
• CTF Player
• Bug Bounty/CVE Hunter
• My Bengali Channel: RoyalBengalHacker

3. TARGET AUDIENCE
• If you are happy with automated hacking tools or scripts, may be you are not the
target audience
• If you are happy to be a script kiddies, may be you are not the target audience
• If you want to know “how deep the rabbit hole goes”, then this is the session for
you
• If you want to contribute with your R&D for our community, then this is the
session for you
• If you want to be an elite (31337), then this is the session for you

4. INTRO TO REVERSE ENGINEERING
• Engineering means a process to make a source code understandable to the
computer by compiling and linking to machine language
• Reverse Engineering means the techniques to get the source code or source like
code from the given binary or executable

5. DEBUGGER VS DISASSEMBLER VS DECOMPILER
• Debugger is a tool that
allows to examine the
state of a running program
• Example: OllyDBG,
WinDBG, Immunity
Debugger etc.
• Disassembler is a tool that
translates machine
language into assembly
language
• Example: OllyDBG, Ghidra,
IDA Pro etc.
• Decompiler is tool that
translates an executable
file to high-level source
code
• Example: JDGui, APKTools
etc.

6. PRE REQUISITE KNOWLEDGE
• Understanding of Operating System and its architecture
• Basic understanding of Programming language
• Basic understanding of Executables
• Basic Understanding of Assembly Languages
• Immense interest and curiosity

7. RE HELPS BELOW DOMAIN
• Malware Analysis
• Software Cracking
• Business Intelligence Gathering
• Exploit Development
• PWNing / Binary Exploitation (in CTF)
• Bug Tracing etc.

8. TOOLS (WINDOWS BASED)
• C/C++/Visual C++ : OllyDBG, Immunity Debugger, IDA Pro etc.
• DOTNET / C# : dnspy, dotnet reflector
• Java: JDGui
• APK: APKTool, dex2jar etc.
• PEiD, CFF Explorer, Hex Editors

9. HELLOWORLD.C
#include <stdio.h>
int main()
{
printf(“Hello World”);
return 0;
}

10. HELLOWORLD.EXE IN DEBUGGER

12. Crack An Application via 5 different techniques
• Using Conditional JMP
• Using Un Conditional JMP
• Using NOP
• Alter ZERO (Z) flag
• Change Address to successmsg

13. THANK YOU