juansacco's CrackMe J1

Author:
juansacco

Language:
C/C++

Upload:
2019-01-09 10:32

Download

Platform:
Windows

Difficulty:
2.0

Quality:
5.0

Arch:
x86

Downloads:
23

Size:
27.50 KB

Writeups:
2

Comments:
22

Description

This is a multi-staged crackme that implements several protections for antidebugging. Objective: Find the keys ( 3 ) to solve the crackme and make a keygen Hint: Run it on a VM :-)

Comments (22)
Writeups (2)

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s4r on 2019-01-10 14:54: Pretty easy, I set its level to 2.

K2000 on 2019-01-14 00:17: I removed the shutdowns and the the checks for debugger but it's still not working. The program just loads and then it quits. A video tutorial would be nice.

juansacco on 2019-01-15 09:15: There are some other protections than isDebuggerPresent() to bypass :-) Keep trying!

juansacco on 2019-01-15 16:53: [Click to reveal]

K2000 on 2019-01-15 19:04: Ok i will try again from the begining but this time I will do it in a VirtualBox because it shutdown my computer multiple times. LOL

K2000 on 2019-01-15 22:57: I tried VirtualBox Version 6.0.2 r128162 and in WindowsXP SP3 and the crackme is not working. It says it's not a valid windows application. Then i tried VirtualBox + Win10 64bit from Microsoft and Windows 10 gives installation error saying OOBEREGION error. How can i test it and debug it in VirtualBox 6.0.2 ?

K2000 on 2019-01-16 06:39: [Click to reveal]

K2000 on 2019-01-16 07:06: The second serial number is my computer name.

K2000 on 2019-01-16 09:20: I can not find the third serial because the program quits.

juansacco on 2019-01-16 15:40: @K2000 you need to bypass the protection so the program doesn't quits or restart your PC hehe

K2000 on 2019-01-16 22:24: What virtual machine do you use to run it ? VirtualBox is not working for me.

juansacco on 2019-01-17 10:26: @K2000 Besides other protections this crack me checks if you are running it inside a VM and if it does, then it quits, you need to bypass this in order to make it run

juansacco on 2019-01-17 10:26: HINT: This crack me uses antidebugging techniques such as: VM Detection , Traps and IsDebuggerPresent

K2000 on 2019-01-17 11:21: You should make a video tutorial about cracking it.

K2000 on 2019-01-18 09:37: Can you include the source code ? I want to see if i understand the source first.

K2000 on 2019-01-18 21:20: I patched the file so much that i completely broke it. Can you include the source code ? Please ?

K2000 on 2019-01-20 17:53: I have a question. Why is it copying itself in memory multiple times ? Is that part of the protection ?

K2000 on 2019-01-21 19:14: [Click to reveal]

S01den on 2019-01-22 18:51: Bro, just relax

K2000 on 2019-01-22 20:08: LOL. Did anybody try to see if that's the last serial ? It only works if you patch the exit and send it back to ask for the 3rd serial.

coyote_0x90 on 2019-05-22 06:21: That looks like last serial. [*] You Won! Happy Cracking! I only had to patch over the conditional jumps after the IsDebuggerPresent calls while I was debugging it. Otherwise, it does not seem to detect that it is running in a VM (VirtualBox 6.0.8). There is an exception thrown, but if it is passed to the program, then the proper exception handler is used and it does not seem to exit.

dzwassim95 on 2024-10-31 13:54: [Click to reveal]

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Solution by ibn5100 on 2019-01-20 18:23:

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Solution by georgepaphitis on 2025-12-06 17:09:

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crackmes.one

crackmes.one

juansacco's CrackMe J1