![]() ![]() ![]() There’s a pretty cool tool that comes pre-packaged with Responder called RunFinger.py. Using RunFinger.py to Find Hosts with SMB Signing Disabled. If there are a lot of hosts in the network, you want to do targeted scans with nmap so you can find some stuff to work with while the full scans are running. Here we see that 172.16.1.5 has signing enabled, which means that is likely a server however, both 172.16.1.100 and 172.16.1.200 have signing enabled but not required, which makes them vulnerable to a relay attack! Now that we have all of the target hosts in a text file, we can use the following script to find the signing status of each IP in the list: nmap -script=smb2-security-mode.nse -iL. From here we want to make a file with all three IPs in it and name it SMB_IPs.txt. nmap -Pn 172.16.1.0/24 -p445įrom this scan we can see there are 3 Windows hosts with port 445 open. To find the SMB signing status of a host, we can utilize one of nmap scripts from the NSE (nmap scripting engine) that comes pre-installed with nmap.Īs an example, let’s say that we ran an nmap scan to quickly find the IP’s of the hosts in the network with port 445 open. ![]() Using Nmap to Find Hosts with SMB Signing Disabled. Even though its ‘enabled’, we can still perform relay attacks because the ‘not required’ portion is essentially the same as being disabled. When it comes to Windows Server machines, you will find that message signing is “enabled and required” by default however, on any workstation, it will say “enabled but not required” by default. When disabled, the authenticity for where the request is coming from is never checked and the system just sees user + hash and lets you in – given you have permission.When enabled, while trying to relay credentials the domain will know you are not really that person because the packet is not signed by you, so it will not let you in.The first thing we need to do to setup this attack is to find the machines in the network that have SMB signing disabled. If the account being relayed has local administrative privileges on the box, you can utilize their privileges to dump SAM hashes or to get a SYSTEM shell on the host. SMB Relay Attack OverviewĪn SMB relay attack is where an attacker captures a users NTLM hash and then relays it to access another machine on the network that has SMB signing disabled. ![]() After that, we will see how we can accomplish an LDAP-relay attack and more by dropping Responder and using another incredible tool called mitm6, which will allow us to exploit IPv6 using ntlmrelayx.py. To start, we will piggy-back off of my last post: LLMNR Poisoning with Responder and see how we can use Responder along with a great tool called ntlmrelayx.py from the Impacket Suite of Tools to perform an SMB-relay attack. In this post we will explore different techniques that can be used to perform NTLM relay attacks to move laterally and access different machines and resources in the network.
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