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