Rating:
# RedPwn wstrings Write Up
## Details:
Jeopardy style CTF
Category: Reverse Engineering
## Write up:
Looking at the main function we see:
```c
int __cdecl main(int argc, const char **argv, const char **envp)
{
wchar_t ws[82];
unsigned __int64 v5;
v5 = __readfsqword(0x28u);
wprintf(U"Welcome to flag checker 1.0.\nGive me a flag> ", argv, envp);
fgetws(ws, 80, stdin);
if ( !wcscmp(flag, ws) )
fputws(U"Correct!", stdout);
return 0;
}
```
Following to where flag is stored in the binary we see:
```
01 00 02 00 00 00 00 00 66 00 00 00 6C 00 00 00 ........f...l...
61 00 00 00 67 00 00 00 7B 00 00 00 6E 00 00 00 a...g...{...n...
30 00 00 00 74 00 00 00 5F 00 00 00 61 00 00 00 0...t..._...a...
6C 00 00 00 31 00 00 00 5F 00 00 00 73 00 00 00 l...1..._...s...
74 00 00 00 72 00 00 00 31 00 00 00 6E 00 00 00 t...r...1...n...
67 00 00 00 73 00 00 00 5F 00 00 00 61 00 00 00 g...s..._...a...
72 00 00 00 33 00 00 00 5F 00 00 00 73 00 00 00 r...3..._...s...
6B 00 00 00 31 00 00 00 6E 00 00 00 6E 00 00 00 k...1...n...n...
79 00 00 00 7D 00 00 00 00 00 00 00 00 00 00 00 y...}...........
```
And we can see that the flag is:
```
flag{n0t_al1_str1ngs_ar3_sk1nny}
```
