Generating shellcode is a task that nearly all pen testers have to do at some point, unless they write their own shellcode. The typical way of generating shellcode consists of using msfvenom, or the combination of msfpayload and msfencode. Both of these methods can easily generate shellcode for the payload of your choice, and you can invoke shellcode encoders, if necessary, to avoid bad characters.
Since its release, Veil-Evasion has always relied on msfvenom for generating the shellcode within Veil-Evasion payloads. Leveraging another tool’s capabilities has allowed us to rely on the Metasploit Framework to handle the shellcode generation without requiring too much effort on our end. However, this has also caused some issues.
more here..........https://www.veil-framework.com/veil-ordnance-fast-shellcode-generation/
Since its release, Veil-Evasion has always relied on msfvenom for generating the shellcode within Veil-Evasion payloads. Leveraging another tool’s capabilities has allowed us to rely on the Metasploit Framework to handle the shellcode generation without requiring too much effort on our end. However, this has also caused some issues.
more here..........https://www.veil-framework.com/veil-ordnance-fast-shellcode-generation/