SMB network scans by nbtscan and nbtstat script in Nmap
nbtscan and nbtstat are free to network scanning software it is finding out vulnerability after scanning network. it generates scanning files, contains the IP Address and other information on the NetBIOS block. it is amazing network scanning tools in kali Linux used for network security auditing and finding out vulnerability.
SMB enumeration is a technique to get all entities related to NetBIOS, If the pentester is working at the windows environment then he reveals the NetBIOS information through the nbtscan.
nbtscan for Linux
The nbtscan tool will generate a report that contains the IP address, NetBIOS computer name, services available, logged in username, and MAC address of the corresponding machines. The NetBIOS name is useful if you want to access the service provided by the machine using the NetBIOS protocol that is connected to an open share. Be careful as using this tool will generate a lot of traffic and it may be logged by the target machines. (Kali Linux- Assuring Security by Penetration Testing – Allen, Lee)
To see the available options for nbtscan just type nbtscan –h in the command line console.
Following options are available with nbtscan
-v verbose output. Print all names received from each host
-d dump packets. Print whole packet contents.
-e Format output in /etc/hosts format.
-l Format output in lmhosts format. Cannot be used with -v, -s or -h options.
-t timeout wait timeout milliseconds for the response. Default 1000.
-b bandwidth Output throttling. Slow down output, it uses no more than bandwidth bps. Useful on slow links, so that outgoing queries don’t get dropped.
-r use local port 137 for scans. Win95 boxes respond to this only. You need to be root to use this option on Unix.
-q Suppress banners and error messages,
-s separator Script-friendly output. Don’t print column and record headers, separate fields with separator.
-h Print human-readable names for services. It can only be used with -v option.
-m retransmits the Number of retransmits. Default 0.
-f filename Take IP addresses to scan from file filename. -f – makes nbtscan take IP addresses from stdin.
<scan_range> what to scan. Can either be single IP like 192.168.1.1 or range of addresses in one of two form xxx.xxx.xxx.xxx/xx or xxx.xxx.xxx.xxx-xxx.
Examples How to use nbtscan
nbtscan -r 192.168.1.0/24
Scans the whole C-class network.
Scans a range from 192.168.1.25 to 192.168.1.137
nbtscan -v -s : 192.168.1.0/24
Scans C-class network. Prints result in script-friendly format using a colon as field separator
nbtscan -f iplist
Scans IP addresses specified in file iplist.
Enumerate smb by nbtstat script in nmap
Attempts to retrieve the target’s NetBIOS names and MAC addresses.
By default, the script displays the name of the computer and the logged-in user; if the verbosity is turned up, it displays all names the system thinks it owns.
sudo nmap -sU –script nbstat.nse -p137 <host>
MODULE 6:- Enumeration