Why exploit failed

Very nice point. I don't exactly understand NAT bs, but you probably right. When setting up the exploit, metasploit detected the ip to use was Subscribe Now.

Add a comment. Active Oldest Votes. Improve this answer. Hamid Bazargani Hamid Bazargani The Overflow Blog. Podcast Explaining the semiconductor shortage, and how it might end.

Does ES6 make JavaScript frameworks obsolete? Featured on Meta. Now live: A fully responsive profile. Create a new project or enter a test project that you've already set up. Click on the Campaigns button. Activate the checkbox "Generate an executable for manual delivery". Save the campaign. Click on Start Campaign. Open and run "ClickMe.

The file will execute but you will not see any user interface. Return to the browser on the Windows machine and click on the Sessions tab. You should now see an open session. Note also the 1 in a blue circle next to the Sessions tab, indicating one active session. If you are not getting a session on the machine, here are a couple of things you can try to identify the issue: On the Metasploit host, check if the Metasploit service is listening on port On Ubuntu, open the terminal window and type netstat -an grep The response should be: If the Metasploit host is not listening, please ensure that the campaign is really started.

Another common reason why there is no session created during an exploitation is that there is a firewall blocking the network traffic required for establishing the session. This firewall could be:. In corporate networks there can be many firewalls between our machine and the target system, blocking the traffic. Suppose we have selected a payload for reverse connection e. The problem could be that one of the firewalls is configured to block any outbound connections coming from the target system.

This is in fact a very common network security hardening practice. Network security controls in many organizations are strictly segregated, following the principle of least privilege correctly. For instance, they only allow incoming connections to the servers on carefully selected ports while disallowing everything else, including outbound connections originating from the servers.

This would of course hamper any attempts of our reverse shells. One thing that we could try is to use a binding payload instead of reverse connectors. For instance, we could try some of these:. Binding payloads work by opening a network listener on the target system and Metasploit automatically connecting to it. A good indicator that this approach could work is when the target system has some closed ports, meaning that there are ports refusing connection by returning TCP RST packet back to us when we are trying to connect to them.

If there is TCP RST coming back, it is an indication that the target remote network port is nicely exposed on the operating system level and that there is no firewall filtering blocking connections to that port.

This is exactly what we want to see. Obfuscation is obviously a very broad topic — there are virtually unlimited ways of how we could try to evade AV detection. Using the following tips could help us make our payload a bit harder to spot from the AV point of view. While generating the payload with msfvenom, we can use various encoders and even encryption to obfuscate our payload. When opening a shell or a meterpreter session, there are certain specific and easily identifiable bytes being transmitted over the network while the payload stage is being sent and executed on the target.

To make things harder to spot, we can try to obfuscate the stage by enabling the stage encoding set EnableStageEncoding true in the msfconsole and selecting an encoder set StageEncoder [TAB].. For example:. Exploits are by nature unreliable and unstable pieces of software. Especially if you take into account all the diversity in the world.