In this post I will show you how to unlock a .zip file without password, for this you need a linux based system. For Windows user you can use VirtualBox to run a virtual version of a linux OS.
You can view the following post to see how to run Kali Linux in VirtualBox for Windows and Mac users :
Installing Kali Linux using VirtualBoxWhen you are done installing a Virtual machine the next step is cracking the password of the .zip file
The video tutorial of cracking a .ZIP file is here :
The cracking involves installing fcrackzip to your system and finding password for your zip file.
The command for installing and cracking .ZIP are :
sudo bash
to get root privileges
apt-get update
to download and update the repositories
apt search fcrackzip
to search 'fcackzip' in the repository
apt-get install fcrackzip
to install the fcrackzip tool
fcrackzip -v -u -b _______
command to crack the password -v is verbose -u is use-unzip and -b is brute-force attack, the ______ must be filled with the path of the .ZIP file
there are a load of option in fcrackzip like
-d can be used for dictionary attack
-c can be used to set character-set of the password attack (eg fcrackzip -v -u -b -c a ,fcrackzip -v -u -b -c A)
-l is used to set length of the password attack to instantiate (eg fcrackzip -v -u -b -l 4 )
Here are the option for the attacks performed using fcrackzip
fcrackzip [-bDBchVvplum2] [--brute-force] [--dictionary] [--benchmark]
[--charset characterset] [--help] [--validate] [--verbose]
[--init-password string/path] [--length min-max] [--use-unzip]
[--method name] [--modulo r/m] file...
OPTIONS
-h, --help
Prints the version number and (hopefully) some helpful insights.
-v, --verbose
Each -v makes the program more verbose.
-b, --brute-force
Select brute force mode. This tries all possible combinations of
the letters you specify.
-D, --dictionary
Select dictionary mode. In this mode, fcrackzip will read
passwords from a file, which must contain one password per line
and should be alphabetically sorted (e.g. using sort(1)).
-c, --charset characterset-specification
Select the characters to use in brute-force cracking. Must be
one of
a include all lowercase characters [a-z]
A include all uppercase characters [A-Z]
1 include the digits [0-9]
! include [!:$%&/()=?{[]}+*~#]
: the following characters upto the end of the spe-
cification string are included in the character set.
This way you can include any character except binary
null (at least under unix).
For example, a1:$% selects lowercase characters, digits and the
dollar and percent signs.
-p, --init-password string
Set initial (starting) password for brute-force searching to
string, or use the file with the name string to supply passwords
for dictionary searching.
-l, --length min[-max]
Use an initial password of length min, and check all passwords
upto passwords of length max (including). You can omit the max
parameter.
-u, --use-unzip
Try to decompress the first file by calling unzip with the
guessed password. This weeds out false positives when not enough
files have been given.
-m, --method name
Use method number "name" instead of the default cracking method.
The switch --help will print a list of available methods. Use
--benchmark to see which method does perform best on your
machine. The name can also be the number of the method to use.
-2, --modulo r/m
Calculate only r/m of the password. Not yet supported.
-B, --benchmark
Make a small benchmark, the output is nearly meaningless.
-V, --validate
Make some basic checks wether the cracker works.
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Unlock a ZIP file without password
By Me And Media →
Sunday, 16 October 2016
