The msfpayload is component of Metasploit allows to generate shellcode, executables, and much more for use in exploits outside of the Framework. Shellcode can be generated in many formats including C, Ruby, JavaScript, and even Visual Basic for Applications. Each output format will be useful in various situations. For example, if we are working with a Python-based proof of concept, C-style output might be best; or working on a browser exploit, a JavaScript output format might be best.
MSFencode
The shellcode generated by msfpayload is fully functional, but it contains several null characters that, when interpreted by many programs, signify the end of a string, and this will cause the code to terminate before completion. In other words, those x00s and xffs can break your payload!
In addition, shellcode traversing a network in cleartext is likely to be picked up by intrusion detection systems (IDSs) and antivirus software. To address this problem, Metasploit’s developers offer msfencode, which helps you to avoid bad characters and evade antivirus and IDSs by encoding the original payload in a way that does not include “bad” characters. Enter msfencode -h to see a list of msfencode options.
The shellcode generated by msfpayload is fully functional, but it contains several null characters that, when interpreted by many programs, signify the end of a string, and this will cause the code to terminate before completion. In other words, those x00s and xffs can break your payload!
In addition, shellcode traversing a network in cleartext is likely to be picked up by intrusion detection systems (IDSs) and antivirus software. To address this problem, Metasploit’s developers offer msfencode, which helps you to avoid bad characters and evade antivirus and IDSs by encoding the original payload in a way that does not include “bad” characters. Enter msfencode -h to see a list of msfencode options.
Example :
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