korniltsev

Setting up Qemu with a tap interface

There are two parts to networking within QEMU:

• The virtual network device that is provided to the guest (e.g. a PCI network card).
• The network backend that interacts with the emulated NIC (e.g. puts packets onto the host's network).

Example: User mode network

korniltsev

#!/usr/bin/python2

"""
    Use scapy to modify packets going through your machine.
    Based on nfqueue to block packets in the kernel and pass them to scapy for validation
"""

import nfqueue
from scapy.all import *
import os

korniltsev

from elftools.elf.constants import P_FLAGS
from elftools.elf.elffile import ELFFile
from unicorn import Uc, UC_ARCH_ARM, UC_MODE_LITTLE_ENDIAN, UC_HOOK_CODE, UC_PROT_READ, UC_PROT_WRITE, UC_PROT_EXEC
from unicorn.arm_const import *
from capstone import Cs, CS_ARCH_ARM, CS_MODE_THUMB, CsInsn
from keystone import Ks, KS_MODE_THUMB, KS_ARCH_ARM

# 找到.text节

filename = "./libcms.so"

korniltsev

#!/bin/bash

for id in $(idevice_id -l); do
	ideviceinfo_data=$(ideviceinfo -u $id)

	product_type=$(echo "$ideviceinfo_data" | grep ProductType | sed 's/ProductType: //g')

	# strip 'iPhone' or 'iPad' and the comma from the product type 
	short_product_type=$(echo "$product_type" | sed 's/iPhone//g; s/iPad//g; s/,//g' )

korniltsev

Usage

In IDAPython,

execfile('<path>/cxxparser.py')
parse_file('<path>/a.cpp',[r'-I<path>\LuaJIT-2.0.5\src', '-D__NT__', '-D__X64__', '-D__EA64__'])
parse_file('<path>/malloc.c',['-target=x86_64-linux-gnu'])

korniltsev

diff -Naur qemu-2.7.0.orig/cpu-exec.c qemu-2.7.0/cpu-exec.c
--- qemu-2.7.0.orig/cpu-exec.c	2016-09-02 17:34:17.000000000 +0200
+++ qemu-2.7.0/cpu-exec.c	2017-01-19 09:34:00.817088525 +0100
@@ -33,6 +33,9 @@
 #include "hw/i386/apic.h"
 #endif
 #include "sysemu/replay.h"
+#include "syscall_defs.h"
+
+extern int do_nx;

korniltsev

/*
 * Copyright (c) 2009-2017, Farooq Mela
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright

korniltsev

import base64
from Crypto.Cipher import ARC4

def str_decrypt(enc_data):
    key = 'fuckav\x00'
    cipher = ARC4.new(key)
    try: 
       enc_data = base64.b64decode(enc_data)
    except:
        return enc_data

korniltsev

IDAPython cheatsheet

Important links

• Porting IDAPython plugins to IDA 7.4
• Hex-Rays IDAPython official documentation

Basic commands

Get informations on the binary