[Reversing] Bypass

This challenge was really fun for a complete noob like me. Thanks @Baikuya!

Your welcome :slight_smile:

Cool challenge, I first tried the other spy, but the obfuscation was “unbreakable” :-). Learned something new.

Type your comment> @Baikuya said:

If someone finds a way to get the flag with static analysis PM me.
I created the Challange and it was meant to use a Debuger like Dnspy :slight_smile:

I did in fact complete the challenge via static analysis. I’ll PM you.

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This was fun. I didn’t know much about .NET and reversing it, nor did I know much about the tools to do it, so this was a very nice way to get to know them both.

If anyone could PM me and help me with this I’d much appreciate it. This is my first time reversing and I can understand the code, but I can’t seem to figure out certain components.

Type your comment> @pythonier5001 said:

If anyone could PM me and help me with this I’d much appreciate it. This is my first time reversing and I can understand the code, but I can’t seem to figure out certain components.

I really need the help as well.

EDIT: Actually this was easy, and very nice. This was my first RE challenge. Feel free to DM me if you need help.

I’m a very beginner in CTFs so I’m with some difficulty to solve it. I was trying to hack the .exe file through radare2, but it was so difficult. So I read here that you guys were using something like dnSpy, but I’m in Linux and I can’t install it. Is there some tool similar to dnSpy to Linux? I saw on the internet a guy that solved this problem using OllyDbg as well, but I’m trying to use it with wine and when I run the Bypass.exe OllyDbg crash. An alternative to OllyDbg in Linux is the edb-debugger, but when the program print “Enter a username:” edb-debugger crash too.

Its easy with basic reverse and basic logic

Type your comment> @Baikuya said:

If someone finds a way to get the flag with static analysis PM me.
I created the Challange and it was meant to use a Debuger like Dnspy :slight_smile:

@Baikuya why create a challenge that requires a specific tool to solve? Just curious. I am using IDA disassembler to solve it and it’s not working. It says processor ‘cli’ is not included. So I have to install and use a tool like Dnspy. This is why I am curious.

Type your comment> @Baikuya said:

If someone finds a way to get the flag with static analysis PM me.
I created the Challange and it was meant to use a Debuger like Dnspy :slight_smile:

I use kali linux and I am running dnSpy with wine. In dnSpy, I am getting an error:

Error: Couldn't find the CLR dll file

Can you help?

Struggling with the Decompiler, dnSpy, usage. I have found the logic to bypass but could not edit the decompiled code.
Any kind of help related to dnSpy would be appretiated.

I’m in the same boat, can’t edit the code. :frowning: New to dnspy

Just did it.

No need to edit anything in the code. Just play with the code using Local Variables.

Type your comment> @IR0nIVI4n said:

Type your comment> @Baikuya said:

If someone finds a way to get the flag with static analysis PM me.
I created the Challange and it was meant to use a Debuger like Dnspy :slight_smile:

@Baikuya why create a challenge that requires a specific tool to solve? Just curious. I am using IDA disassembler to solve it and it’s not working. It says processor ‘cli’ is not included. So I have to install and use a tool like Dnspy. This is why I am curious.

There are other debuger as well. I just like using Dnspy cause I’am used to it :slight_smile:

If someone is stuck you can DM me :slight_smile:

Basic but high quality, makes me learned something about IL

am stuck a little i see some cipher generator but am not sure what the result is am i in the right track ?

Great work @Baikuya ! A simply but intereresting challenge.

Thanks again! :wink:

Type your comment> @Civero said:

Great work @Baikuya ! A simply but intereresting challenge.

Thanks again! :wink:

Thanks :slight_smile: