Awesome

#Wireless Hacking With SDR And GnuRadio

###0x01 信号捕获市面上常见的无线遥控工作的频段，通常工作在315Mhz、433Mhz，也有少数的会采用868Mhz.915Mhz这几个频点。我们可以用电视棒、HackRF、BladeRF等SDR硬件来确定遥控的工作频率：打开软件按下遥控器后，能在瀑布图上看到明显的反应： osmocom_fft -F -f 433e6 -s 4e6

gqrx

无线遥控中心频率：433870000

###0x02 录制信号 SDR软件通常支持录制信号，可将遥控的信号保存为wav音频文件或者以.cfile、.raw格式保存。

这里用gnuradio-companion流图来实现信号录制以及信号重放。

<pre> wget http://www.0xroot.cn/SDR/signal-record.grc gnuradio-companion signal-record.grc </pre>

左侧osmocom Source模块调用SDR硬件，我们设置其中心频率为433.874MHz，采样率为2M:

右侧上边 QT GUI Sink模块将捕获到的信号在瀑布图上展示出来，右侧下边的File Sink将录制到的信号保存为/tmp/key.raw文件：

执行流图，按下遥控前：

按下遥控：

转到/tmp 缓存目录：

###0x03 信号重放接下来再用gnuradio-companion写个信号重放的流图：

<pre> wget http://www.0xroot.cn/SDR/signal-replay.grc gnuradio-companion signal-replay.grc </pre>

左侧File Source调用捕获到的key.raw信号文件,osmocom Sink调用HackRF、BladeRF将信号发射出去，与此同时QT GUI Time Sink、QT GUI Frequency Sink模块分别在屏幕上显示时间轴（时间域）、频率幅度（频率域），执行流图：

bingo!

0x04 信号分析

inspectrum key.raw

信号分析&转码细节参考：如何使用SDR+inspectrum逆向分析无线遥控信号一文。

<pre> s = '' a = [0.333033, 0.326189, 0.0332124, 0.388094, 0.326704, 0.0154539, 0.322883, 0.0270275, 0.0150091, 0.443235, 0.362946, 0.027745, 0.430879, 0.443824, 0.0277048, 0.330736, 0.0290668, 0.0133217, 0.376686, 0.0123277, 0.00931546, 0.446231, 0.397617, 0.0162406, 0.447861, 0.0050071, 0.0109479, 0.389289, 0.0271959, 0.0138626, 0.32109, 0.0268736, 0.0129828, 0.401142, 0.326009, 0.0303488, 0.379368, 0.0229494, 0.0134011, 0.318115, 0.346288, 0.017666, 0.333818, 0.326769, 0.0141554, 0.341832, 0.0291055, 0.0153984, 0.446665, 0.399975, 0.024566, 0.316297, 0.0159851, 0.010876, 0.428384, 0.444201, 0.0214323, 0.376211, 0.00628675, 0.0105036, 0.44565, 0.0195615, 0.012549, 0.445242, 0.366523, 0.0225733, 0.324775, 0.0192127, 0.0134437, 0.318991, 0.381386, 0.0149852, 0.00882163, 0.447015] for i in a: if i > 0.1: s +='1' else: s +='0' print s </pre> <pre> python test.py 11011010011011010010011010010010011010011011010011010011010010011010011001 </pre>

<pre> pip install bitstring </pre> <pre> python import bitstring bitstring.BitArray(bin='11011010011011010010011010010010011010011011010011010011010010011010011001').tobytes() </pre>

Automated RF/SDR Signal Analysis [Reverse Engineering]

<pre> Payload : formatted hexcode \x36\x9b\x49\xa4\x9a\x6d\x34\xd2\x69\x9 </pre>

thanks for tresacton‘s help GitHub

0x05 Hacking The world with watch

德州仪器生产的EZ430 Chronos手表由于采用了MSP430芯片，该芯片支持发射1GHz以下频率的无线信号,覆盖市面上各种常见的无线遥控频率（315MHz、433MHz、868MHz、915MHz）:

5.1 开发环境搭建

到 TI德州仪器官网下载：(需注册账号) CCS studio (Code Composer Studio ):http://processors.wiki.ti.com/index.php/Download_CCS

FET-Pro430-Lite程序:http://www.elprotronic.com/download.html

SmartRF Studio : http://www.ti.com.cn/tool/cn/smartrftm-studio

以及GitHub上面的 miChronos项目代码：http://github.com/jackokring/miChronos

百度网盘：https://pan.baidu.com/s/1hsse2Ni

windows 7如果不是Service Pack 1 则需下载安装Windows 7 和 Windows Server 2008 R2 Service Pack 1 (KB976932)补丁，否则无法安装 Code Composer Studio 下载地址：https://www.microsoft.com/zh-cn/download/confirmation.aspx?id=5842

0x06 refer

[Michael Ossmann: Software Defined Radio with HackRF, Lesson 11: Replay YouTuBe https://www.youtube.com/watch?v=CyYteFiIozM ](Michael Ossmann: Software Defined Radio with HackRF, Lesson 11: Replay YouTuBe https://www.youtube.com/watch?v=CyYteFiIozM)

[TI eZ430-Chronos Hacking quickstart http://timgray.blogspot.jp/2012/12/ti-ez430-chronos-hacking-quickstart.html](TI eZ430-Chronos Hacking quickstart http://timgray.blogspot.jp/2012/12/ti-ez430-chronos-hacking-quickstart.html)

[The hackable watch: a wearable MSP430 MCU http://www.itopen.it/the-hackable-watch-a-wearable-msp430-mcu/](The hackable watch: a wearable MSP430 MCU http://www.itopen.it/the-hackable-watch-a-wearable-msp430-mcu/)

[You can ring my bell! Adventures in sub-GHz RF land... http://adamsblog.aperturelabs.com/2013/03/you-can-ring-my-bell-adventures-in-sub.html?m=1](You can ring my bell! Adventures in sub-GHz RF land... http://adamsblog.aperturelabs.com/2013/03/you-can-ring-my-bell-adventures-in-sub.html?m=1)

[TI EZ430 Chronos watch, quick guide / tutorial to hacking the firmware https://www.youtube.com/watch?v=20dVNyJ8fYw&feature=youtu.be](TI EZ430 Chronos watch, quick guide / tutorial to hacking the firmware https://www.youtube.com/watch?v=20dVNyJ8fYw&feature=youtu.be)

###Author:雪碧0xroot @漏洞盒子安全团队 VULBOX Security Team