Late Easter Challenge

I was planning to release this during Easter but, unfortunately, I didn’t manage to finish it on time. So this Easter challenge has just become a late Easter Challenge.

#Difficulty
I have no idea as I haven’t tried to solve it myself… it may bevery easy or very tricky so here is a poll for the community to classify it

  • Piece of Cake
  • Doable
  • Insane

0 voters

#Hints

Hint 1: The title of the post is the first hint… Easter…
Hint 2: You will get it when you need it

Rules

Post the secret message using the sploit tag in the comments to demonstrate you made it

Be free to write up how you did it

The challenge

Copy the text below in a text file and then do the usual thing:

cat text_file.txt | base64 -d | gunzip > eo
chmod 777 eo

_Note: As it looks like this challenge is a bit tricky than originally envisioned, this is a non striped version of the challenge that should be easier to solve… the binary is still obfuscated tho. You can find the original challenge at the end of the post in case you still want to try the hard way :slight_smile: _

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This is the original challenge

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2 Likes

If you are lazy. Run this one-liner :wink:

curl https://0x0.st/g-r.txt | base64-d | gunzip > eo && chmod 777 eo

Personally, I didn’t know where to start, so I pulled up my favourite RE article. And I was still stuck. After finding main I struggled to locate any references to fread or any sorts of calls. What am I doing wrong?

2 Likes

Whoever solves it, please don’t forget to blur your solution.

1 Like

I have added a non stripped version of the challenge that should be easier… You won’t find fread or similar calls but you should be able to figure out the equivalences

Hey, I only just noticed this thread a couple of hours ago.

Jokes aside, @pry0cc, RE goes much deeper than just what is given to you in the clear. Understanding the macro (execution flow of the entire binary) and micro (code constructs which have specific patterns and behaviours) is a necessary skillset you need to develop. It will come in time but you have to start looking deeper and reading between the lines to evolve your mindset which will lead you to generate assumptions and conclusions to guide you to the correct path. RE is an art form and you need to take the time and effort to nurture it.

4 Likes

Thats why i in general like taking those challenges, if i have the time to invest more than am hour in one session into it…
Its difficult and frustrating but every small advancement makes you feel like you’re boss.
If RE were a piece of cake everyone could it.

Edit: adding on this I’ll definitively try the original challenge once i can find a day where i have a couple of hours. So thanks in advance for this @0x00pf .

2 Likes

I know this is the case. I am trying to develop my skillset, and the way to do that is through practice. The fact I struggled with this is not surprising, seeing @_py struggle with this, however, makes me wonder if it is a lot harder than everybody previously thought.

I’m either close or completely off or I found it (though it shouldn’t be it yet). Here is a tricky message I got:

‘’’
Well done. But… this is not the bean you have to grind!
‘’’

1 Like

Looks like the hint you found was not clear enough.
Let’s try with another one:


This is a Easter challenge because an Easter Egg is hidden in it.
To find it, you may need to grab a JAR of coffee. The Indonesian one is pretty good

1 Like

Done. Write-up on its way soon (need to nap first).

Thank you @0x00pf for the challenge! I hope you don’t mind me making a separate write-up of the solution.

Password: omelette

1 Like

Congrats! :trophy: @_py

Sure… please do. I’d love to see how did you solve it!.. and I agree, probably a separated write-up will be more convenient :slight_smile:

1 Like