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  1. CTF Competitions
  2. SANS CTF 2020
  3. Binary

BM01

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Last updated 4 years ago

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About The Challenge

Type

Difficulty

Binary

Medium

‌Solution

The second binary challenge was also a Linux binary, but here it was not easy.

By executing the binary program, we prompting with the message Can you get the flag out of me?.

In this challenge we have the debug the binary in order to solve it. We can use any debugger tools, I used IDA.

Using IDA I run the program to debug it. As previous figure shows on the left windows the functions that the program having, I make break point the end before the program stops and exit. To investigate the heap data and what is stored on the program memory.

As above figure shows at the button section is heap data.

I found the flag that is written in tiny letters.

After that, I used CyberChef in order to decode Hex values and get the actual letters.

Flag: ⁿᵒᵗᴳᵒⁱⁿᵍᵀᵒᴹᴬᴷᴱᵗʰⁱˢᴼⁿᵉᔆ⁰ᴱᶻ