title: C Stands For C

category: Reverse

difficulty: Intro

point: 50

author: Zerotistic#0001

description:

So I heard about a secret shop who uses a strong password, but it seems like they forgot you were even stronger ! Hey, if you find the password I’ll give you a flag. Sounds good? Sweet!

Solution

Un simple strings sur le fichier permet de récupérer des informations intéressantes :

> strings "C Stands For C" -n 16

/lib64/ld-linux-x86-64.so.2
__stack_chk_fail
__libc_start_main
_ITM_deregisterTMCloneTable
_ITM_registerTMCloneTable
Hi, please provide the password:
JQHGY{Qbs_x1x_S0o_nl13x_n0_f00E_Nb3l3}
Welcome to the shop.
Who are you? What is your purpose here?
GCC: (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0
[...]

On voit clairement un format de flag. Un simple ROT6 dessus permet de le récupérer en clair.

Ici on peut utiliser CyberChef

FLAG : PWNME{Why_d1d_Y0u_tr13d_t0_l00K_Th3r3}