Silent Courier
The statement#
A mysterious file is being secretly transferred between servers. Your task is to intercept the transfer and uncover the hidden secret. Can you track it down before it’s too late?
Solution#
File is analyzed using apacket.
The zip file is encrypted.
$_ unzip protected.zip
Archive: protected.zip
[protected.zip] secret.zip password: %
Crack it with johntheripper
$_ zip2john protected.zip > zip.hash
ver 2.0 Scanning for EOD… FOUND Extended local header
protected.zip/secret.zip PKZIP Encr: cmplen=137, decmplen=178, crc=13905395
$_ john –wordlist=/usr/share/dict/rockyou.txt zip.hash
[archlinux:61650] shmem: mmap: an error occurred while determining whether or not /tmp/ompi.archlinux.1000/jf.0/4292542464/shared_mem_cuda_pool.archlinux could be created.
[archlinux:61650] create_and_attach: unable to create shared memory BTL coordinating structure :: size 134217728
Using default input encoding: UTF-8
Loaded 1 password hash (PKZIP [32/64])
Will run 12 OpenMP threads
Press ‘q’ or Ctrl-C to abort, almost any other key for status
supersonic (protected.zip/secret.zip)
1g 0:00:00:00 DONE (2024-12-09 00:49) 50.00g/s 1228Kp/s 1228Kc/s 1228KC/s 123456..271087
Use the “–show” option to display all of the cracked passwords reliably
Session completed