Crack_Me V1 (Easy to Medium difficulty)

[bkRy]

Hello bkRy here,

so yesterday I saw a "Crack Me" made by Mezmaa and I decided to make one myself, so here it is!

What do you need to find?
->You have to find the "correct" key_s to get access.

 

https://www.virustotal.com/de/file/3...is/1478118769/

 

https://www.metadefender.com/#!/resu...racted/summary

!If you are going to post the "answer" + !explanation!, please put it into a spoiler tag!

I will post the code of the whole programm since both of those scans are getting false-positives... Just in case you wanna compile it yourself
Don't cheat by looking at the code!

 

#include <windows.h>
#include <iostream>
#include <random>
#include <time.h>

bool isKeyPresent = FALSE;
unsigned int inputKey;

int main(){
	SetConsoleTitle("Crack_Me-MPGH v1 - by bkRy");
	std::cout << "\t\t\tCrackeMe v1 by bkRy" << std::endl;

#pragma region math
	int tempSerial;

	
		srand(time(NULL));
		//getting rand. values with <time.h>
		unsigned int x = rand();
		Sleep(30);
		unsigned int z = (rand()) + x;
		Sleep(30);
		unsigned int y = (rand()) + x;
		Sleep(30);
		unsigned int multiX = 15;
		Sleep(30);
		//done getting rand. values, should be big enough to make a "good" key				


		unsigned int q = z*((x + y)*(x + y));
		unsigned int p = x*((x - y)*(x - y));
		unsigned int multi = y / multiX;

		tempSerial = (((((q - p) + multi))*(x / 10)) / x); //all that should equal https://prntscr.com/d21km1
		tempSerial += tempSerial;				



		if (tempSerial > 2){
			isKeyPresent = TRUE;
		}
		else{goto end;} //prevent no key "cracks"

		rtry: //could have placed the rtry on 45, but to prevent cracks lets put it up here
		if (isKeyPresent == TRUE){	
			std::cout << "What is the Key?\n" << "Key: ";
			std::cin >> inputKey;

			if (inputKey == tempSerial){
				std::cout << "\nCongratulations!\nPlease leave a 'thanks' on my profile if you enjoyed it!" << std::endl;
				Sleep(5000);
				goto end;
			}if (inputKey != tempSerial){
				std::cout << "Wrong key...\nTry again!" << std::endl;
				Sleep(700);
				system("cls");
				std::cout << "\t\t\tCrackeMe v1 by bkRy" << std::endl;
				goto rtry;
			}


		}	
		
		if (isKeyPresent == FALSE){goto end;} //prevent no key "cracks"
#pragma endregion



	end:
	return 0;
}

//EDIT forgot to compile file in Release mode, uploaded it new + virustotal updated

[Zaczero]

Ill check it tomorrow
Which language did you use ?

[bkRy]

Ill check it tomorrow
Which language did you use ?

C++ only

[[MPGH]Hugo Boss]

Not sure why this was automatically approved, but your file seems to be safe.

Also: https://virustotal.com/en/file/6be37...is/1478042164/
The VirusTotal link you provided was not the file uploaded in attachments, so I re-uploaded it for you (link above this sentence).

[Zaczero]

msvcp120d.dll missing.
You have compiled your app in Debug mode. Can't run it w/o libraries.
Compile it in Release and attach new file

- - - Updated - - -

cracked.
i've compiled source by myself w/o looking into it
----------------------------------------------------------
My cracking process:

 

 

 

 

 

 

 

 

[[MPGH]Hugo Boss]

Again, not sure why the file you posted was auto-approved, but here are the corresponding virus scan links:
https://virustotal.com/en/file/288dc...is/1478117119/
https://virusscan.jotti.org/en-GB/fi...job/csf24a4boo

[Zaczero]

Again, not sure why the file you posted was auto-approved, but here are the corresponding virus scan links:
https://virustotal.com/en/file/288dc...is/1478117119/
https://virusscan.jotti.org/en-GB/fi...job/csf24a4boo

Thanks,
I've forgot about that virus scans

[bkRy]

Compile it in Release and attach new file

@Zaczero thanks for pointing that out! Changed file + VirusTotal links!

[Zaczero]

@Zaczero thanks for pointing that out! Changed file + VirusTotal links!

Waiting for more advanced versions

[__readgsqword]

@Zaczero the key is not strange at all. It's just randomely generated upon each execution.
But of course a simple byte patch does the trick, change je to jne, etc. I think my solution is a bit more interesting. Rather than just jumping, I forced your binary to print the key for me. I won't post the executable, but I made a short video. Whenever it comes to hacking and cracking, try to be unorthadox. It makes it more fun.

https://*************.com/open?id=0B8...DhLZFlZbDFYcUU