Custom OpenCL kernel only works when Kernel thread is 1

September 1, 2019, 11:13 am

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Hello,

I've came across a new hash algorithm based on MD5 recently which was not supported by Hashcat so I set out to write my own OpenCL kernel for it.
After a lot of (frustrating) time researching and trial and error, I finally managed to get it working.
My kernel was based on the algorithm 3710 - md5($salt.md5($pass)). I've only implemented the pure version and only for straight mode attack to use wordlists.
However while it works fine at this point, it only seems to work when I use the flags "-T 1 --force" which I'm sure it is limiting my cracking speeds a lot. If I remove these flags, Hashcat uses the 64 kernel threads by default (I think) and it doesn't seem to be able to crack any passwords.

Any hints on what could be the problem? I'm really clueless on this one.
Let me know if you want to check my code, I would be happy to share it.
I'm using the source code of Hashcat 5.1.0 running with a single OpenCL device (nVidia).

Thanks.

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Using Cuda 10.2 after OpenCL installed

September 1, 2019, 3:33 pm

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CUDA API (CUDA 10.2)
====================
* Device #1: GeForce GTX 1080, 8118 MB, 20MCU

OpenCL API (OpenCL 1.2 pocl 1.1 None+Asserts, LLVM 6.0.0, SPIR, SLEEF, DISTRO, POCL_DEBUG) - Platform #1 [The pocl project]
===========================================================================================================================
* Device #2: pthread-Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz, skipped

OpenCL API (OpenCL 1.2 CUDA 10.2.120) - Platform #2 [NVIDIA Corporation]
========================================================================
* Device #3: GeForce GTX 1080, skipped


From what I've been reading Hashcat would perform better using the 3rd option(which is skipped). I've read over the help files, but I can't find anything directly addressing this issue. I'm not sure if I need to uninstall the CUDA 10.2 or if I can somehow just tell hashcat to use the OpenCL 1.2 Cuda. It has been a long road to get to this point, and I will really appreciate some help.

Need help

September 2, 2019, 8:56 am

≫ Next: Found a password - Recovered ?

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Hello! Im totally new to Hashcat and have not used any such tool before.

I have a email adress with like ~5 missing characters and i also have the md5 hash of the full email. And i guess this would not be super hard to crack. 

I would really appreciate if someone could tell me how i should do this, and if possible give example of a full hashcat command.

Thanks.

What i got:

email: example****@gmail.com
md5 hash: 120b8510fd7091bc12f890433f65036f

GPU: Rtx 2080

Help me crack the unknown characters please. The above is just an example but the adress i got is in the exactly same format.

Found a password - Recovered ?

September 3, 2019, 2:38 am

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Hi there

I'm trying Hashcat and so far every thing seems to run just fine. But I'm not sure how to see if Hashcat has success in finding a password. I guess that if it find a password, I should see "Recovered" change from 0/1 to 1/1. Is that correct ?

I'm comparing a passwordlist to a WPA handshake.

OpenCL kernel self-test failed and slower than benchmark

September 3, 2019, 4:13 am

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My GPU and CPU usually work fine with hashcat but when I use some attack modes with my Intel CPU, there is an error

ATTENTION! OpenCL kernel self-test failed

I followed the instruction for the wrong driver but it hasn't solved the error. How do I solve the error?

When I use the same attack modes with just my GPU, the benchmark is 10 times higher than the actual performance. Is that because the CPU isn't being used because of the error?

Separating words in combinator attack with space

September 4, 2019, 3:32 am

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I trying to find a way to put a space between words in a combinator attack with two or three dictionaries. I thought about appending or prepending the dictionaries with a rule for a space character. I have searched previous threads but can’t find anything that works when I try it. 
Any suggestions on how to do this would be greatly appreciated.

Installed it but doesn't work when i try to open it in cmd

September 4, 2019, 7:21 am

≫ Next: low speed. brute force with a mask

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I created a hash.hash file but when i tried to run it with this "hashcat64.exe -a 3 -m 0 -w 4 hash.hash -i ?a?a?a --force"
it doesn't show anything.(this might have been posted bfr,sorry if that's the case). 

low speed. brute force with a mask

September 4, 2019, 3:38 pm

≫ Next: Linux + AMD + hashcat

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When testing md5, my speed is 1600 mhash / s, but when using brute force, the speed drops dramatically, 8.7 mhash / s. I don’t understand what this is connected with, I use 5 static characters and a mask, for example 12345?d?d?d?d? d?d?d?d, at the same time low speed. Testing found that in version 5.1.0 if there is one static character, then the speed does not drop, if two drops to 500 mhash / s, if there are more unchanged characters, the speed is always 8.7 mhash / s. But in version 3.6, the speed does not drop with two characters, with three 500 mhash / s, more than 8.7 mhash / s fixed characters.
example: v5.1.0
-a 3 -m 0 -O -w 3 hash 12345?d?d?d?d?d?d?d?d
speed 8.7 mhash / s
-a 3 -m 0 -O -w 3 hash 123?d?d?d?d?d?d?d?d
speed 8.7 mhash / s
-a 3 -m 0 -O -w 3 hash 12?d?d?d?d?d?d?d?d
speed 500 mhash / s
-a 3 -m 0 -O -w 3 hash 1?d?d?d?d?d?d?d?d
speed 1600 mhash / s

v3.6.0
-a 3 -m 0 -O -w 3 hash 12345?d?d?d?d?d?d?d?d
speed 8.7 mhash / s
-a 3 -m 0 -O -w 3 hash 1234?d?d?d?d?d?d?d?d
speed 8.7 mhash / s
-a 3 -m 0 -O -w 3 hash 123?d?d?d?d?d?d?d?d
speed 500 mhash / s
-a 3 -m 0 -O -w 3 hash 12?d?d?d?d?d?d?d?d
speed 1600 mhash / s
-a 3 -m 0 -O -w 3 hash 1?d?d?d?d?d?d?d?d
speed 1600 mhash / s


How can I get full speed and is it possible?
Why does it work differently in different versions?
I hope for help.
Thank you in advance for any help.
Sorry for the text, I am writing through a Google translator.

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Linux + AMD + hashcat

September 5, 2019, 5:44 am

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Hi,
I just wanted to share the steps that made me able to use hashcat in a linux distro with an amd card
hope this will help someone..

Tested on:
Linux: Ubuntu 18.04
AMD: RX580
hashcat: 5.1.0+1394

Steps:
1. sudo apt-get install ocl-icd-libopencl1 opencl-headers clinfo
2. Install: https://rocm.github.io/install.html (OpenCL-only Installation of ROCm)
3. Reboot
4. apt remove rocm-dkms
5. Reboot
6. Install AMDGPU Driver (./amdgpu-install --opencl=legacy,rocm --headless)
7. Reboot
8. apt remove amdgpu-dkms
9. Reboot


in my case i had problems with the updated dkms which results in a freeze once i type clinfo or use hashcat..
faq:
1. why installed dkms in the first place? idk
2. why too many reboots? idk, maybe just to make sure i'm using the right kernel?

there is many confusions while dealing with amd in linux
https://hashcat.net/faq/wrongdriver was helpful but not much, there was no amdgpu mentioned, without it was unable of running hashcat (maybe bcz pci rejects atomics ?, as that what i was keep getting as a message on dmesg)

.....

Hash benchmark slower than expected

September 5, 2019, 7:10 am

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When I use some attack modes with Hashcat, the Hash benchmark is slower than expected.

There are no benchmark for my graphic card online but I know what the benchmark should be and how fast the benchmark is for other hashes with my card. Is there anything that can be done? Why isn't hashcat using the full power of the graphic card with some hashes?

some info about rules

September 6, 2019, 3:02 pm

≫ Next: Best strategy for keyword attack

≪ Previous: Hash benchmark slower than expected

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hi, i'm reading some info about rules, but i don't understand if that is possible.
i have a wordlist with all lowercase words, how can i change the first letter of every word from lowercase to uppercase?

exsample :

antonio = Antonio
guitar = Guitar

Best strategy for keyword attack

September 7, 2019, 4:57 pm

≫ Next: correct dictionary but he doesn't think

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Hello guys pls help.
I have a password  (for example MikeStronger!23)
This password doesn't much for current hash but is good for another.
Is any automatic generator  passlist by keyword (MikeStronger)?
Or what the best tactic for attack?

correct dictionary but he doesn't think

September 7, 2019, 9:30 pm

≫ Next: Winrara's new zip encryption algorithm is incompatible

≪ Previous: Best strategy for keyword attack

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I would like a help

I installed hashcat version 5.1.0 on windows on my notebook

however when running the command hashcat -d 0 -m 2500 file hccapx wordlist.txt it arrives at the speed of 15000, but not crackea a
password, I already have the password but it does not show me, if I use the aircrack there he gets, does anyone have an idea of what can be ???

-d 0 -> and my GPU
converted file on hashcat site

notebook and a toshiba - tecra 940

Winrara's new zip encryption algorithm is incompatible

September 9, 2019, 1:14 am

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≪ Previous: correct dictionary but he doesn't think

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hashcat

13600    WinZip    $zip2$*0*1*0*9728599510190140*b013*0**37448f09fa06cb899efa*$/zip2$

Zip file

$zip2$*0*3*0*0200bddff2d391360b1d7abe1506db71*351b*2f90*ZFILE*targetText.zip*0*49*f874c97be773965e91b3*$/zip2$

Old head
    $zip2$*0*1*0*
New Head
    $zip2$*0*3*0*

run code 

hashcat -a 3 -m 13600 '$zip2$*0*3*0*0200bddff2d391360b1d7abe1506db71*351b*2f90*ZFILE*targetText.zip*0*49*f874c97be773965e91b3*$/zip2$'


Final cracking failure

Hash '$zip2$*0*3*0*0200bddff2d391360b1d7abe1506db71*351b*2f90*ZFILE*targetText.zip*0*49*f874c97be773965e91b3*$/zip2$': Token encoding exception

No hashes loaded.

I tried to delete some characters and failed to crack them.

hashcat -a 3 -m 13600 '$zip2$*0*3*0*0200bddff2d391360b1d7abe1506db71*351b*2f90*49*f874c97be773965e91b3*$/zip2$'

problems with —show

September 9, 2019, 6:20 am

≫ Next: btcrecover second hash

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Hello friends, I am trying to get the key of my wifi router using the pkmid captured with the appropriate tools.  When launching the hashcat command, everything works fine until the process is finished, which launched the —show command and shows nothing in terminal or in the hashcat.pot file or using -o.  Does this mean you haven't found the key?  Do I have a permissions problem so it doesn't save anything?

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btcrecover second hash

September 9, 2019, 6:24 am

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how cani extract second hash from blockchain aes json file?
it shows pass incorrect https://i.imgur.com/pXROLMm.png
but i type valid password https://i.imgur.com/HHcbo4O.png

Radeon HD 6990 GPU

September 9, 2019, 11:16 am

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I got an old Radeon HD 6990 GPU.
Is it possible that this card unsupported by hashcat?
Its a hybrid system. I have installed 2 nVidia GPUs. These are working correctly.

freeroute@Vanda:~$ lsb_release -a
LSB Version: core-9.20170808ubuntu1-noarchecurity-9.20170808ubuntu1-noarch
Distributor ID: Ubuntu
Description: Ubuntu 18.04.3 LTS
Release: 18.04
Codename: bionic


uname -a
Linux Vanda 5.0.0-27-generic #28~18.04.1-Ubuntu SMP Thu Aug 22 03:00:32 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

I tried to install driver by this instruction: https://github.com/RadeonOpenCompute/ROCm

Thank you for your support.

Supported cards

September 9, 2019, 2:42 pm

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Where to find exact list of graphic cards that are supported in newest hashcat ?
Specifically I want to check for RX 470, but I like to see complete list of all supported cards if it is possible and if it exist ?

Thanks.

Problem with the github release

September 10, 2019, 9:21 am

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I had to crack a PKZIP file from a challenge and noticed that hashcat version in the repository didn't have support for PKZIP. So i downloaded the github release but it doesn't find any compatible device, while the normal version does.
Every requested library and runtime is installed

System

Kernel: 5.2.0-2-amd64 x86_64
Distro: Debian GNU/Linux bullseye/sid
CPU Dual Core: Intel Core i5-3320M
Graphics: Intel 3rd Gen Core processor Graphics driver: i915 v: kernel

Found a password - Recovered ?

September 3, 2019, 2:38 am

≫ Next: track the cracking?

≪ Previous: Problem with the github release

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Hi there

I'm trying Hashcat and so far every thing seems to run just fine. But I'm not sure how to see if Hashcat has success in finding a password. I guess that if it find a password, I should see "Recovered" change from 0/1 to 1/1. Is that correct ?

I'm comparing a passwordlist to a WPA handshake.