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Category: Hitcon

[HITCON] Handcrafted pyc – 50pts

Description Can your brain be a Python VM? (Please use Python 2.7) crackme.py Hint None   Solution Firstly, we have converted it to pyc files.

We try to decompile it by using uncomple2 , but we found that it missed 8 bytes of pyc header. After we fixed the file, it is able to decompile and we got a part of data Here is the comparison part, so we can trace the flag here Finally we got

Convert all of the ascii code to string to get the flag. hitcon{Now you can compile and run python bytecode in your brain!}

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[HITCON]Are you rich 1/2 – 150pts

Solution We found that after we get the address by using this link , the btc are always zero. So we guess there are valid btc address or flag inside their database. In order to list out all the record and try to submit all the address in their database, we write this script to do that.

After that, we found that all the address in their database contains 0 BTC. It means we should find the address which has more than 5 btc. Finally i have found this website which listed out top 100 richest bitcoin addresses. Since the website do not accept the address which is not in their database , so we can made an fake result to bypass this limit.

hitcon{4r3_y0u_r1ch?ju57_buy_7h3_fl4g!!} hitcon{u51n6_07h3r_6uy5_b17c0n_70_byp455_ch3ck1n6_15_fun!!}  

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