- After Downloading the challenge file, i checked the file type and i was a data file :
- First thing i used foremost tool to extract any useful files from this data file :
- after i extracted the files i started to check all the files , but i found nothing .
- Thin i opened the data file using HxD editor ( or any hex editor )
- Thin i search with “flag“ keyword, and i got some hits :
- there are some python scripts, so i started to extract them manually :
- so i tried to decode the encoded command in the first script, but there was an error in base64 :
- so i used the second script :
- thin i used chatgpt to parse the extracted script :
- As you can see, we need two things : the KEY and the contents of the flag.txt file .
- from the first script i get the KEY :
- Thin i started to search about file contents, so i searched with “flag.txt” keyword and i got a hit :
- now i found this site to decrypt fernet encryption :
flag{a4096cd70d8859d38cf8e7487b4cd0fa}
