https://elvisblue.github.io/A minimal, responsive and feature-rich Jekyll theme for technical writing. 2025-07-24T05:00:19+00:00 Elvis Blue https://elvisblue.github.io/ Jekyll © 2025 Elvis Blue /assets/img/favicons/favicon.ico /assets/img/favicons/favicon-96x96.png 2023-07-02T02:00:00+00:00 2023-07-03T03:04:40+00:00 https://elvisblue.github.io/posts/ziy-solution/ Elvis Blue

How to find a good crackme on crackmes.one? The answer is simple: good crackme usually created by skill reverser. ziy for example. I downloaded it 1 year ago but still have no time to try it until now. It takes me about 1 week to solve this. Challenge overview An ELF file which ask user to input 60 characters password. No obfuscation, no anti-debug or anti-disassembler trick but the code is qu...

2023-06-17T02:19:00+00:00 2024-04-14T14:26:53+00:00 https://elvisblue.github.io/posts/nahamcon-mayhem-solution/ Elvis Blue

Last weekend I spent my free time to play NahamCon CTF with idek team. We managed to get 3rd place and first blood on Mayhem challenge. Here is a quick write up for the challenge. Challenge overview The SOC team noticed a system periodically beaconing to a suspicious IP address. A snapshot of the suspicious process' memory was taken but the IR team wants to know what exactly is going on with...

2023-06-17T02:19:00+00:00 2024-07-04T02:29:56+00:00 https://elvisblue.github.io/posts/hvm-solution/ Elvis Blue

This is my old solution for s4r’s hvm crackme Analyze the crackme As the crackme’s description said that it’s a virtual machine (vm) one. Usually I will go quick while talking about reverse engineering the vm interpreter and will go into detail about vm ops code, what kind of vm, how does vm work,…. But this crackme worth to talk about the vm interpreter. The way crackme run the vm is very cr...