Rating:
# C Stands For C
## Find the flag
**In this challenge, we can download a [file](https://github.com/siunam321/CTF-Writeups/blob/main/PwnMe-2023-8-bits/Reverse/C-Stands-For-C/c_stands_for_c):**
```shell
┌[siunam♥earth]-(~/ctf/PwnMe-2023-8-bits/Reverse/C-Stands-For-C)-[2023.05.06|14:10:26(HKT)]
└> file c_stands_for_c
c_stands_for_c: ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=6e85bb68ae41114c0b985f48263414ae9c715507, for GNU/Linux 3.2.0, not stripped
┌[siunam♥earth]-(~/ctf/PwnMe-2023-8-bits/Reverse/C-Stands-For-C)-[2023.05.06|14:10:28(HKT)]
└> chmod +x c_stands_for_c
```
It's an ELF 64-bit executable, and it's not stripped.
**We can try to run that executable:**
```shell
┌[siunam♥earth]-(~/ctf/PwnMe-2023-8-bits/Reverse/C-Stands-For-C)-[2023.05.06|14:10:30(HKT)]
└> ./c_stands_for_c
Hi, please provide the password:
idk
Who are you? What is your purpose here?
```
That being said, we need to find the correct password.
**To do so, I'll use `strings` command in Linux to list out all the strings inside that binary:**
```shell
┌[siunam♥earth]-(~/ctf/PwnMe-2023-8-bits/Reverse/C-Stands-For-C)-[2023.05.06|14:11:52(HKT)]
└> strings c_stands_for_c
[...]
Hi, please provide the password:
JQHGY{Qbs_x1x_S0o_f00E_b3l3???y65zx03}
Welcome to the shop.
Who are you? What is your purpose here?
[...]
```
Right off the bat, we see a string that looks like a flag. However, it's being rotated.
**We can use [CyberChef](https://gchq.github.io/CyberChef/) to rotate it back:**
- **Flag: `PWNME{Why_d1d_Y0u_l00K_h3r3???e65fd03}`**
## Conclusion
What we've learned:
1. Using `strings` To Display Strings In A File & Rotating Rotated String
