# Shopkeeper ## Challenge ### Challenge 1 ![challenge 1](https://github.com/TwentySick/CTF/blob/61692e9bc51578758f826e7b04a0368a158d6594/2022/HackPack%20CTF/reverse_engineering/shopkeeper/images/challenge1.png) ### Challenge 2 ![challenge 2](https://github.com/TwentySick/CTF/blob/61692e9bc51578758f826e7b04a0368a158d6594/2022/HackPack%20CTF/reverse_engineering/shopkeeper/images/challenge2.png) ### Challenge 3 ![challenge 3](https://github.com/TwentySick/CTF/blob/61692e9bc51578758f826e7b04a0368a158d6594/2022/HackPack%20CTF/reverse_engineering/shopkeeper/images/challenge3.png)\ They create 3 challenges using the same host\
Using to connect: nc cha.hackpack.club 10992 # or 20992
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What would you like to do? 1) Buy 2) Sell 3) View Your Inventory 4) Leave Shop
## Solution ### Flag 1 decode base64 and get flag\ (I wish I knew the base64 part is from ELF execute file soon)\ Flag: ``` flag{b4s364_1s_s0_c3wl_wh0_kn3w_you_c0u1d_do_th15} ``` ### Flag 2 Earning money by buying negative Oranges or Apples.\ Stop when having more than 100 coins (gold), buy key flag and get flag.\ ![solved 2](https://github.com/TwentySick/CTF/blob/61692e9bc51578758f826e7b04a0368a158d6594/2022/HackPack%20CTF/reverse_engineering/shopkeeper/images/solve_chall_2.png)\ Flag: ``` flag{g00d_job_y0u_b3at_7he_sh0pk3eper} ``` ### Flag 3 I recognized the base64 part giving by them is base64 encode from a file ELF Execute.\ I decode this part and turn it to Hex to get the file (I think Hex is more accurate than ASCII is)\ It's actually happened like what I think, I get this file and use ghidra to check.\ Looking at function Level2 and function main, I know if I have 19 coins after buying key, I can go to Level 2 (challenge 3).\ ![decompiler_chall_3](https://github.com/TwentySick/CTF/blob/61692e9bc51578758f826e7b04a0368a158d6594/2022/HackPack%20CTF/reverse_engineering/shopkeeper/images/decompiler_chall_3.png)\ Successfully accessed level 2, I spent a little time to spam '99999' to bet and I got the flag when I was correct at bet 4 times.\ ![solved 3](https://github.com/TwentySick/CTF/blob/61692e9bc51578758f826e7b04a0368a158d6594/2022/HackPack%20CTF/reverse_engineering/shopkeeper/images/solved_chall_3.png)\ Flag: ``` flag{w0w_you_can_pr3d1ct_th3_future?!?} ``` Original writeup (https://github.com/TwentySick/CTF/tree/main/2022/HackPack%20CTF/reverse_engineering/shopkeeper).