Author:
1337ReverseEngineer

Language:
C/C++

Upload:
3:08 PM 01/10/2023

Download

Platform
Windows

Difficulty:
3.0

Quality:
4.3

Arch:
x86

Description

First crackme in multi part series VMAdventures. This aims to introduce you to the concept of code virtualization. Hard crackme. No patching. Your main objective is to find a secret key to get "Correct key!" to print to the chat. If you need hints, please read hint text files. I will most likely upload source code later and link it in the comments.

• Comments
• Solutions

r0B on 1:20 PM 01/12/2023: Welcome to VMAdventures indeed :) Thanks for the upload!

aryanmmb on 12:28 PM 01/13/2023: Good Crackme Tanx {{Welcome to ??????tures :)}}

CyGhost on 3:38 PM 01/20/2023: Any hints? I am new too this stuff and this is as far as i got myself: https://imgur.com/a/ywcKTP0

Jollyc on 2:28 PM 01/21/2023: CyGhost, take a look at the function above the if statement

sa2304 on 1:51 PM 01/23/2023: Thanks, that was a nice one. The hardest part for me was to deal with multibyte NOPs: old tools like ollydbg & ida5 do not understand it. I thought that was the bytecode executed in SEH handler when InvalidOpcode interrupt occurs :)

50r4 on 10:44 PM 01/28/2023: good one

dev0 on 12:25 PM 03/11/2023: How did you code the vector operations in the function?

Yanderome on 7:41 PM 06/07/2023: @dev0: He didn't. That just optimizations from the compiler.

safareto on 10:40 PM 07/28/2023: Hey can you upload the source code please? I have been trying to learn this concept and would appreciate to see how it was setup

setadr12 on 12:07 AM 01/28/2024: @Yanderome how can i contact you?

kubaf on 10:37 AM 03/26/2024: thanks for the sample "flag{Welcome to VMAdventures :)}"

majorek31 on 9:09 PM 03/27/2024: I feel very welcomed to those VMAdventures! i love vms this one was pretty fun ngl omw to checkout second part!

abc00012345 on 2:10 PM 04/04/2024: not i: cracks the algoritm i: try to crack the algorithm: 🤯 changing some things in assembly code to return everytime correct password

survivalizeed on 8:40 PM 04/11/2024: Very nice crackme. One thing I would suggest is that you make "smaller" instruction steps so the jumptable becomes bigger and harder to RE. Just four instructions is a bit less. Anyways... Thanks for sharing :)

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