CrYP70NYM's CrYP70NYM'S CRACKME FIXED

Author:
CrYP70NYM

Language:
C/C++

Upload:
2024-06-10 11:26

Download

Platform:
Windows

Difficulty:
2.0

Quality:
4.3

Arch:
x86-64

Downloads:
17

Size:
1.05 MB

Writeups:
2

Comments:
31

Description

This is a very easy crackme for people who just started reverse engineering! This is a fixed version btw i didn't realise the code generation was broken on the first release!

Comments (31)
Writeups (2)

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JJJack on 2024-06-11 16:02: Isn't it better to specify it as "Arch: x86"?

fvckwindows1337 on 2024-06-12 17:12: hello, i'm a bit newbie to crackmes. what should i do here? write a keygen or just find valid key using debugger?

CrYP70NYM on 2024-06-13 03:55: Reply to fvckwindows1337: Great that you are a newbie 1: You can make a keygen but if your a new to this i wouldnt recommend that. 2: You cannot find the valid key using the debugger because it is randomly generated every time the crackme is executed! 3: The best way to crack it is making it so that it jumps to the success message even if the code you inputted is wrong! Remember this crackme was made for people who are new!

egorcpp on 2024-06-13 16:59: Hi! I just solved this problem as you said it in third point (i changed jmp instruction after test). But i can not understand how i can create keygen, because any key will be wrong (there is test al, al instruction that always evaluates as true and je always jump). Sorry, if i spoil flag or solution, but i dont know how to say otherwise

goxdevislearningreversing3131 on 2024-06-13 17:10: I cracked it (My first crack)

egorcpp on 2024-06-13 17:13: oh, sorry, i was wrong, i see how to crack it...

cracked_it on 2024-06-13 17:57: What is the password for zip folder?

egorcpp on 2024-06-13 18:06: read faq (password is crackmes.one)

0xfafafafa on 2024-06-13 18:59: This is an amazing beginner challenge! I have found an alternative way of solving it without patching. I will work on a keygen and submit. Thank you for posting!

earlyBIRBirl on 2024-06-18 08:35: My first Cracked Crackme woop woop

EARTHISFLAT on 2024-06-18 12:15: My first crack!!!!!!

Kewtn on 2024-06-18 20:02: i think i cracked it but yea this is my second crack ever this is fun!

engiValk on 2024-06-22 19:06: You can absolutely debug this so that you can find the key as the branching path loads the key into memory for the test al,al instruction. The randomness is a cool addition though.

SpottedZulu2217 on 2024-06-22 21:09: I am new, the file is zip-protected with a key is this the ctf?

flcksr on 2024-06-23 04:00: The valid key should be at memory address 004019C0 in x64dbg, just make sure to hit F9 a few times to let the crackme run.

cnathansmith on 2024-06-23 20:36: @SpottedZulu2217 Every challenge is zipped with the password crackmes.one

CrYP70NYM on 2024-06-24 04:45: Congratulations to everyone who cracked this crackme! I will SOON (I dont know exactly when) make a video on my YouTube Channel (CrYP70NYM) on every way to crack this crackme!

flcksr on 2024-06-27 08:41: Wrote a "keygen" for this https://drive.google.com/file/d/157jpz6rmPdHpk738uy_dKqATkoWfVkNv/view?usp=sharing

0xbytebandit on 2024-06-27 13:15: hello , its a nice crackme for me as a beginner, i solve it but i need to write a c code that read the value that the pointer point on it wich is the key generated , any video or code can help me ( im new to c ) and thanks

skarm on 2024-06-28 04:26: new here. i also cracked it using x64dbg by setting a breakpoint on Window's create window API and tracing the call stack

CrYP70NYM on 2024-06-28 09:23: flcksr, You made a great keygen! i suggest you upload it to the solutions section on crackmes.one for my crackme!

0xbytebandit on 2024-06-28 10:49: skarm i dont think he use an windows api to genrate the key but i found with ida a function called generatevalidserial at 401500, you can make a break point on this address on x32dbg

0xbytebandit on 2024-06-28 10:55: flcksr can you shared with me the source code of the keygen im new to windows api's and c

flcksr on 2024-06-28 17:43: Here is the source code of my keygen logic, it's not the full source code of the program but its everything involved in the "keygen" https://pastebin.com/raw/4hjm0zkB

OfirDrake on 2024-06-28 20:58: ZMXFQJKXLGLKCLAM will be vaild, there is a keygen function/you can reverse or debug to get a valid key from code or the register

CrYP70NYM on 2024-06-29 00:45: @0firDrake, Yes that is true but the code wont be valid for everyone since the code is randomly generated everytime the executable is opened.

thebalkenbro on 2024-07-02 07:14: what is the password to extract it??

dredge on 2024-07-14 11:12: cracked 2-4 min

huejazz on 2024-07-20 20:18: password is always generated at address 004019C0

user901 on 2024-07-26 12:54: That was fun! It was my first one. took me a bit to understand how to use x64dbg but it was definitely worth it! thanks

Akmore on 2024-08-14 11:10: Solved !!! Notes: 1. Wrote a Keygen which is basically a Memory Hack found the pointer address that points to the key and prints the value. 2. Wrote the keygen in python

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Solution by Benbaby on 2025-01-05 04:37:
I hate random. Explaination & source code.

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Solution by georgepaphitis on 2025-08-11 14:48:

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