Author:
exxtruder

Language:
C/C++

Upload:
11:00 PM 12/06/2025

Download

Platform
Windows

Difficulty:
4.0

Quality:
4.0

Arch:
x86-64

Description

Second stage of the VM Crackme challenge. A moderately complex virtual machine, with the verification algorithm also slightly more complicated. Task: Generate a Name/Serial pair. Patching is not allowed.

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BigLongs on 1:06 AM 12/11/2025: You Cooked with this one User: TestUser10 (Example) Serial: stUser (Example) I wanted to show the code but it became a complete mess :(

Elvis on 2:38 AM 12/11/2025: @BigLongs: Yes please don't dump the source code on comment section. However you can dump it in gist or something then post the link

dimkasi2 on 4:29 PM 12/11/2025: This is what the author's program might have looked like -- https://github.com/mashituladi-star/-exxtruder-crackmes.one-VM-Crackme-Challenge-1.-Moderate-VM- (but not complete because I was too lazy to continue)

exxtruder on 12:09 AM 12/13/2025: @BigLongs: Great job! The point was to understand how virtual code works and to find a vulnerability. Hash calculation was used to mislead LLMs, since almost all of them try to reverse the hash.

exxtruder on 12:12 AM 12/13/2025: @dimkasi2: Try to reconstruct the code of the virtual program and understand the algorithm.

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