For people who don’t know this style of hacking, Bruteforcing is the act of attempting to crack a password or device by using every possible letter, number and/or symbol that could potentially be the password. Its generally quite slow due to the vast amount of variations it has to try to crack the password which makes it an inefficient method of hacking large passwords (over 10 characters). It is however and old and well tested concept and through trial and error it will crack a password… eventually.
Note: If your running an Intel Pentium 3 processor then go away. You’ll be dead by the time it cracks the password! The more power you have the faster you can pull this off (theoretically) so if you’ve got a nice beefy Intel Core 2 Duo or a Core i7 your in business. Pentium 4 users can still pull this off but expect a very hot processor! Its best to do this at night when your sleeping because unless your running a virtual machine with a throttled CPU allowance you won’t be able to do much with your machine as it pushes your CPU quite high to speed up the attack.
In this tutorial i will show you how to run a Bruteforce Perl Script to crack a MD5 Hash which contains a password. A MD5 Hash is a 128bit encryption method developed back in 1991 which has become bog standard in many internet services. MD5 Hashes can be hacked out of a servers database where they are held for login verifications. Many services such as Facebook, Hotmail and other services use MD5 encryption to keep your data safe, or so you might think…
You can check the code at the bottom of this article or alternatively you can download it from the “Insanity Pop Download Center”. If you want to build the perl file yourself then i recommend you name it “md5_bruteforcer.pl” to correspond with this tutorial. I also recommend you download it or build it to your Backtrack’s desktop for easy access.
Getting Started:
Open up a new shell and type the following replacing “Desktop” with the location of the perl script:
cd Desktop
Now run the scrip in the shell by typing the following:
perl md5_bruteforcer.pl
You should now see a bunch of text on your screen. For this tutorial i’ve shared a screenshot of this code so you can verify you have it running.
Requirements:
- MD5 Hash
I talked about this earlier so if you didn’t read it i suggest you scroll up. If you have your Hash key ready then you can continue with the tutorial.
- A Charset
We need to decide what characters we want to use to perform our brute force. The perl script is capable of bruteforcing any of the following symbols individually or combined.
- Non Caps Letters: abc, etc…
- Caps: ABC, etc…
- Numbers: 1234567890
- Additional Characters: !\”\$%&/(=?-.:\*’-_, etc…
We can add additional characters and symbols to the script by adding the following line of code (replacing “ID” with a letter but not the following “a, A, d, x” and replacing “INSERT SYMBOLS HERE” with the symbols you want to include in the attack. Embed this onto line 17 of the source code:
if ($ARGV[0]=~"ID") { $alpha = $alpha. "INSERT SYMBOLS HERE";}
- A Min Character Term
The min character term is the minimum amount of characters the attack will start with. Normally passwords for email accounts or social networking accounts require a minimum of 6 characters during sign up so its a good idea to start with 6. If the MD5 is pulled from a site which has a minimum requirement of a different number then choose this number here.
- A Max Character Term
The max character term is the maximum amount of characters the attack will use. Note the larger you make this the longer the attack will take. If you think the user you are bruteforcing is not “tech savvy” then its a good idea to make this number the same as the minimum requirement or slightly larger such as 8 characters.
Run the attack:
Now that you have the above requirements its time to run the code. Type the following into the shell window and prepare to wait a long time for the attack to complete:
perl md5_bruteforcer.pl aAdx 1 10 900150983cd24fb0d6963f7d28e17f72
Replace md5_bruteforcer.pl with the name of your perl file.
Replace aAdx with the charset you want to use.
Replace “1″ with the min character term.
Replace “10″ with the max character term.
Replace “900150983c, etc…” with your MD5 Hash.
Check the code:
#!/usr/bin/perl
# * md5_bruteforcer.pl
# *Usage:
# *./md5crack
# *nUm/b0
$ver = "02"; $dbgtmr = "1"; #Intervall of showing the current speed + lastpassword in seconds.
if ($dbgtmruse Digest::MD5 qw(md5_hex);
use Time::HiRes qw(gettimeofday);
if ($ARGV[0]=~"a") { $alpha = "abcdefghijklmnopqrstuvwxyz";}
if ($ARGV[0]=~"A") { $alpha = $alpha. "ABCDEFGHIJKLMNOPQRSTUVWXYZ";}
if ($ARGV[0]=~"d") { $alpha = $alpha."1234567890";}
if ($ARGV[0]=~"x") { $alpha = $alpha. "!\"\$%&/()=?-.:\\*'-_:.;,";}
if ($alpha eq "" or $ARGV[3] eq "") {usage();};
if (length($ARGV[3]) != 32) { die "Sorry but it seems that the MD5 is not valid!\n";};
print "Selected charset for attack: '$alpha\'\n";
print "Going to Crack '$ARGV[3]'...\n";
for (my $t=$ARGV[1];$t}
sub usage{
print "\n\nMD5 Password Bruteforcer v_$ver\n";
print "www.insanitypop.com\n";
print "See Insanity Pop for instructions on how to use this script\n\n";
print "USAGE\n";
print "./md5crack \n";
print " Charset can be: [aAdx]\n";
print " a = {'a','b','c',...}\n";
print " A = {'A','B','C',...}\n";
print " d = {'1','2','3',...}\n";
print " x = {'!','\"',' ',...}\n";
die "Quitting...\n";
}
sub crack{ $CharSet = shift;
@RawString = ();
for (my $i =0;$ido{
for (my $i =0;$i length($alpha)-1){
if ($i==$CharSet-1){
print "Bruteforcing done with $CharSet Chars. No Results.\n"; $cnt=0;
return false;
} $RawString[$i+1]++; $RawString[$i]=0;
}
} ################################################## # $ret = "";
for (my $i =0;$i$dbgtmr){ $cnt = int($cnt/$dbgtmr);
print "$cnt hashes\\second.\tLast Pass '$ret\'\n"; $cnt=0; $Start = gettimeofday();
}
print "$ARGV[3] != $hash ($ret)\n";
if ($ARGV[3] eq $hash){
die "\n**** Password Cracked! => $ret\n";
} ################################################## #
#checkhash($CharSet)."\n";
$RawString[0]++;
}while($RawString[$CharSet-1]}
sub checkhash{ $CharSet = shift; $ret = "";
for (my $i =0;$i$dbgtmr){ $cnt = int($cnt/$dbgtmr);
print "$cnt hashes\\second.\tLast Pass '$ret\'\n"; $cnt=0; $Start = gettimeofday();
}
if ($ARGV[3] eq $hash){
die "\n**** Password Cracked! => $ret\n";
}
}
will you do a gpu brute force tutorial pls?
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