ASIS CTF Finals 2014

Description

Download this file and find the flag.

Solution

After unziping this file we found that it's x64 ELF. At the main function we see some buffer dexoring:

Lets dexor it and save to file (IDA command line with idapython used):

Description:

Download the file and find the flag.

Solution:

After downloading and uncompresing file we can see that it's x64 ELF binary. When I opened it in IDA, I've found that there are tons of code, which seems to be created by flex (The Fast Lexical Analyzer):

Task:

Connect here and find the flag:

`nc asis-ctf.ir 12435`

Solution: