hashcat Forum

I don't quite get how the charsets work, so I have a few questions.

If I write "?l?l?l?l?l?l?l?l" as charset in oclHashCat, then I have defined a charset of 8 characters, ranging from aaaaaaaa-zzzzzzzz, right?

But, if I write "?l?l?l?l?l?l?l?d" as charset, then I have defined it as 8 characters, ranging from aaaaaaa1-zzzzzzz9, right? And so on..

If what I've written above is correct, how can I define a charset on 8 characters, a-z, 0-9? 9 characters and a-z, 0-9 and so on..

Thanks in advance for answers.

you want to set a variable. it's called custom charset

follow link to examples. https://hashcat.net/wiki/doku.php?id=mask_attack

(Without bruteforce attack selected, it just goes to wordlist stdin mode, and does 0 c/s and 0% idle, also does not crack any hashes)
I set custom charset 1 to ?l?d, but when using attack mode 3:

When removing brute force option and setting a new charset, which follows hex rules, it's finished here:

When setting the charset as in the Wiki link you sent:

So could you, maybe, explain it a little bit more?

(Also if I set attack mode as bruteforce, how does the characterset mode work there?)

the first example you had it on bruteforce attack mode but didn't specify a mask

the second example, when -a isn't specified it defaults to -a 0 attack mode. failed because you didn't specify a wordlist

the third example you provided a mask but forgot to put it in bruteforce mode, -a 3

some attack mode examples:
* Attack modes:
0 = Straight
1 = Combination
3 = Brute-force
4 = Permutation
6 = Hybrid dict + mask
7 = Hybrid mask + dict

hashcatexecutable -a 0 hashfile.txt wordlist.txt
hashcatexecutable -a 1 hashfile.txt wordlist1.txt wordlist2.txt
hashcatexecutable -a 3 hashfile.txt ?u?u?u?u?u?u?u?u?u?u
hashcatexecutable -a 4 (never used it so don't know)
hashcatexecutable -a 6 hashfile.txt wordlist.txt ?u?u?u?u
hashcatexecutable -a 7 hashfile.txt ?u?u?u?u wordlist.txt

Every mask I set, HashCat reports that the mask is to big. Is there any way to resolve that? Like increasing host-memory?

If hashcat reports the mask is to big it is usually saving you from starting an attack that would take longer than you life

That's cool and all, but when setting the charset as characters "a", "b", isn't there something wrong then?

as i said, as usual

(09-04-2012, 06:03 PM)23732 Wrote: [ -> ]That's cool and all, but when setting the charset as characters "a", "b", isn't there something wrong then?

Lots of discussion in the air. Give all the command lines that you have used that gives a mask too big error.