> For the complete documentation index, see [llms.txt](https://ravins-organization.gitbook.io/ctf-writeups/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ravins-organization.gitbook.io/ctf-writeups/2024/gryphons-ctf-2024/misc/gryphonsos.md).
# GryphonsOS
Welcome to GryphonsOS!
We are given a ppsm file which means that there is a macro running and it will auto run. However if we open the file in powerpoint, we can see a whole bunch of clues that will lead us to the flag.
Firstly, we can find out whats the order of the flag. This might not make much sense now, but it will make more sense as we go through it.
The first part, the audio file, spooky.wav.
Lets take a look at it and see if we can find any clues. By opening it in audacity, we can see the spectogram shows the following
This is in braille, for reference
Thus the first part decodes to SPECTRAL
Now, onto the second part. We are given code.py, and the value of output.txt being "ㄝㄞㄜㄨㄝㄞ"
By reversing this code, we can obtain back the missing word.
```python
encoded_text = "ㄝㄞㄜㄨㄝㄞ"
decoded_text = ""
for i in encoded_text:
decoded_text += chr(ord(i) - 12505)
print(decoded_text)
#Output is DECODE
```
Thus, we get the 2nd part, DECODE
Onto part 3 now, the maze. By writing out what each of the symbols represent after decoding them using the navy flags translator (), and then tracing out the path of the maze, we can trace the answer to be S-I-G-N-A-L
Thus part 3 is SIGNAL
Onto part 4, where it seems to be a completely black image. However there is something hidden in it for sure.
By increasing the exposure, we can see the hidden message in it.
Thus giving us part 4, HIDDEN
making the flag, `GCTF24{SPECTRALDECODESIGNALHIDDEN}`
