Server Message Block (SMB) protocol’s security track record has been poor for more than 10 years, due to its complex implementation, and open nature.
SMB versions clarifications: o SMB1 – Windows 2000, XP & Windows 2003
o SMB2 – Windows Vista SP1 & Windows 2008
o SMB2.1 – Windows 7 & Windows 2008 R2
o SMB3 – Windows 8 & Windows 2012
here find some ways to identify SMB netbios service:
nmap -p 139,445 -oG smb.txt 192.168.1.100‐254
using nbtscan (available in kali linux):
nbtscan -r 192.168.1.0/24
null sessions allow unauthenticated servers (or hackers) to obtain browse list from other MS servers. this means it’s possible to access large amounts of information about the machine, such as pwd policies, usernames, group names, machine names, users and host ids. this feature existed in SMB1 by default, later restricted though.
enum4linux is a tool that extracts information from a windows computer using a SMB null session (also present in kali)
enum4linux -a 192.168.1.26
remember nmap NSE scripts? also possible to discover & enumerate SMB services. can be found in /usr/share/nmap/scripts directory, as many flavours as you can imagine, just type:
ls -l /usr/share/nmap/scripts/smb*