devil's-secret-stash

Forensics/Steganography

In the depths of the Pine Barrens, a cryptic legend whispers of the Jersey Devil guarding a picture. Tales speak of forgotten knowledge sealed within, but only those sharp enough to see the truth can unlock its secrets. The key? The key hiding in plain sight, woven into the eerie folklore itself, waiting for the chosen few to discover and reveal the dark treasures within.

Author: malanka

245KB

devil.jpg

image

Given a single image, I was able to find a hidden zip file using binwalk:

$ binwalk devil.jpg

DECIMAL       HEXADECIMAL     DESCRIPTION
--------------------------------------------------------------------------------
0             0x0             JPEG image data, EXIF standard
12            0xC             TIFF image data, big-endian, offset of first image directory: 8
15196         0x3B5C          Copyright string: "Copyright (c) 1998 Hewlett-Packard Company"
250250        0x3D18A         Zip archive data, encrypted compressed size: 55, uncompressed size: 27, name: flag
250447        0x3D24F         End of Zip archive, footer length: 22

Extracting the zip out of the image, and then attempting extract the zip, prompted me for a password:

$ 7z x 3D18A.zip

7-Zip 24.07 (x64) : Copyright (c) 1999-2024 Igor Pavlov : 2024-06-19
 64-bit locale=en_US.UTF-8 Threads:16 OPEN_MAX:1024

Scanning the drive for archives:
1 file, 219 bytes (1 KiB)

Extracting archive: 3D18A.zip
--
Path = 3D18A.zip
Type = zip
Physical Size = 219

Enter password (will not be echoed):

Because I didn't have a password, I cracked it using zip2john and john:

$ zip2john 3D18A.zip > zip.hash

$ john zip.hash
Using default input encoding: UTF-8
Loaded 1 password hash (ZIP, WinZip [PBKDF2-SHA1 256/256 AVX2 8x])
Cost 1 (HMAC size) is 27 for all loaded hashes
Will run 16 OpenMP threads
Proceeding with single, rules:Single
Press 'q' or Ctrl-C to abort, almost any other key for status
Almost done: Processing the remaining buffered candidate passwords, if any.
Proceeding with wordlist:/usr/share/john/password.lst
Proceeding with incremental:ASCII
250250           (3D18A.zip/flag)
1g 0:00:00:09 DONE 3/3 (2024-11-18 11:50) 0.1102g/s 83859p/s 83859c/s 83859C/s beriler..203226
Use the "--show" option to display all of the cracked passwords reliably
Session completed.

Using the password 250250 I was able to extract the zip and get the flag:

Enter password (will not be echoed):
Everything is Ok

Size:       27
Compressed: 219

$ cat flag
NICC{J3rS3y_D3v1l_Arch1V3}