The Hacker Playbook 3: Practical Guide To Penetration Testing [PDF]

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The Hacker Playbook 3: Practical Guide To Penetration Testing Book

The last thing we need to do is create a Stage 0 payload to have our initial executable bypass all AV detection. If you aren’t aware, Stage 0 in Meterpreter is the first stage of any exploit or payload. This is a chunk of code that does one simple thing: connect back, or listen, in our desired way (reverse_https, reverse_tcp, bind_tcp, etc) and then receives a metsrv.dll file. It then loads this file in memory and executes it.

In essence, any Stage 0 payload is just a glorified “download-and-execute” payload. Because this is how all of the Metasploit functions, there are advanced signatures and heuristics for Metasploit specific behavior in many antivirus solutions – even modifying the shellcode and adding junk code will still flag due to the heuristic behavior.

To get past this, we write our own Stage 0 that performs the same function (download and execute in memory): we mirror the download calls of Meterpreter’s reverse_https payload to fetch metsrv.dll from the server, and then reflect it in memory and execute it.