pratorian Posted September 28, 2015 Posted September 28, 2015 Hey everyone! New here! Hoping i can get some guidance. I can't seem to get Ncrack to work for me. Im trying it, for the first time. The machine I'm trying to crack is one of my VM's. SSHd is running. The password to the ssh account is the very last password in 500.txt password file. Ive tried a bunch of variations of the command I'm issuing. Here's an example of the output i keep receiving. Any suggestions? Thanks! pratorian$ ncrack -v -user root -P 500.txt 192.168.0.5:22 Starting Ncrack 0.4ALPHA ( http://ncrack.org ) at 2015-09-27 22:08 PDT ssh://192.168.0.5:22 finished. Ncrack done: 1 service scanned in 108.11 seconds. Probes sent: 159 | timed-out: 0 | prematurely-closed: 69 Ncrack finished. Quote
i8igmac Posted September 28, 2015 Posted September 28, 2015 I want to point out firewall or other modules may be preventing a success... Try and change your ip, place the password first in the list and try again... you may have been flagged by ip... try another tool, i think thc-hydra supports ssh... Quote
pratorian Posted September 30, 2015 Author Posted September 30, 2015 I was able to successfully crack with THC-Hydra. It does support SSH. I like Hydra, its just bothersome that i can't get this to work, for no apparent reason. Also, shouldn't be the firewall. Not the IP, for sure. Quote
cooper Posted September 30, 2015 Posted September 30, 2015 Did you check the log on the VM side of things? Maybe SSH is blocking future login attempts because of the high volume of incoming requests. Quote
i8igmac Posted September 30, 2015 Posted September 30, 2015 Its not as simple as installing a tool... there are several default security mechanisms. its up to the attacker to figure out each red flag... before a real attack is launched, you must find ways around these red flags... As Cooper said, if to many failed login attempts happen to quickly , then the service will not allow authentication even if the correct credentials are used... this will most likely prevent a single ip address from authenticating! So, how many failed login attempts will trigger this flag? Maybe 5... you must probe the service in a way that will reveal this red flag so you can design a attack algorithm that will evade this security feature... You can alternate threw a list of proxy's per each login attempt, this can be done with proxychains for example... If you want to learn, I like to teach. Quote
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