Analysis ClickMe .NET

2 minute read

Introduction

This challenge is called ClickMe. it is written in .NET

First, if you run the exe file (ClickMe) there is a message box will appear as the following:
After clicking on “OK” there are three monsters you must beat them depending on their “hp” you must click “number of clicking” as the following:

But the third monster requires to click 100.000.000 times to beat him as the following:
Detailed Analysis
So the first step is to know which language is that app is written to deal with so I used Detect it easy “DIE” to know as the following:
After knowing that we are gonna use “dnSpy” to analysis this .NET Code
After loading that app on dnSpy we are gonna go to the entry point so by clicking right-click on the app and go the entry point as the following:
It runs the form as the following:
We have three monsters and their names store in “monster_a[]”as the following:

There is a variable called “cur_hp_num” it decreases by one each time you click on the “Hit” to beat him. I put a break point there to watch its value as the following
I added the variable on the watch section to watch its value
for beating him, I put the value for “cur_hp_num” by zero “0” and starting debugging as the following :
The final message is :

I did as I did in the previous two monsters but it appears a message says “It’s not fair! Cheating is wrong”
I searched for this message and I found it inside a condition that checks another variable’s value that must not equal one “1”
Then I searched for that variable called “check_point”, and I found it increases by one inside a condition check “the monster must be the third one and the cur_hp_num must be 689”
So I change this variable “check_point” and make it “1” “true” to not enter in the condition of the message “It’s not fair! Cheating is wrong”
Then I changed the value for the cur_hp_num by zero “0”
As the following

Thansk ☻♥