Snowy Rock

DESCRIPTION

am loves puzzles and his dad working in alaska sent a message hidden within for him to uncover. Can you decode it? Author: Rakhul FLAG FORMAT: dsc{[a-zA-Z0-9_]+}

Solution

  • Running strings on the jpg provided we see there is a snowyrock.txt embedded in it

  • We can extract it using binwalk -e snowy_rock_fi.jpg

  • We get a encrypted zip file

  • We can crack it using John the Ripper and using the rockyou wordlist zip2john 3CA15.zip > zip.hash john zip.hash -w=/usr/share/wordlists/rockyou.txt

┌──(kali㉿kali)-[~/…/Writeups/DeconstruCTF 2023/Snowy-Rock/_snowy_rock_fi.jpg.extracted]
└─$ john zip.hash -w=/usr/share/wordlists/rockyou.txt 
Using default input encoding: UTF-8
Loaded 1 password hash (PKZIP [32/64])
Will run 4 OpenMP threads
Press 'q' or Ctrl-C to abort, almost any other key for status
11snowbird       (3CA15.zip/snowyrock.txt)     
1g 0:00:00:01 DONE (2023-08-07 15:16) 0.6666g/s 8918Kp/s 8918Kc/s 8918KC/s 1208417808..11ppt06895s
Use the "--show" option to display all of the cracked passwords reliably
Session completed.

  • We get the password as 11snowbird

  • extracting snowyrock.txt using the password, we find whitespaces in it

  • Stegsnow can deal with whitespaces stegsnow -C snowyrock.txt

  • We get a base64 encoded string: OFTHA62GMFBGUX3FIJYFQZS7ONBGKX3FGM2HS7I= which decodes to qfp{FaBj_eBpXf_sBe_e34y}

  • Then we rot13 decode it to get the flag

┌──(kali㉿kali)-[~/…/Writeups/DeconstruCTF 2023/Snowy-Rock/_snowy_rock_fi.jpg.extracted]
└─$ echo "qfp{FaBj_eBpXf_sBe_e34y}" | rot13   
dsc{SnOw_rOcKs_fOr_r34l}

  • FLAG: dsc{SnOw_rOcKs_fOr_r34l}

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