Writeup Author: gardc
Since this is a reversing challenge, we start by opening the binary in the reverser’s tool of choice. In this case, I’m using Binary Ninja.
Instantly we see a string of interest in the decompiled main function: LWA{z0_tBjo_y0aha3_pu_ao4a_z7y1un}. This appears to be our flag, but it’s encoded with a Caesar cipher.
Using CyberChef, we can perform a brute force Caesar shift to decode the flag.
By applying a shift of 19, we successfully decode the flag: EPT{s0_mUch_r0tat3_in_th4t_s7r1ng}.