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摩托x的逆向分析

發(fā)布時間：2024/1/1 编程问答 51 豆豆

生活随笔收集整理的這篇文章主要介紹了摩托x的逆向分析小編覺得挺不錯的,現(xiàn)在分享給大家,幫大家做個參考.

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apk放入jadx-1.2.0中很明顯被奇虎360加固了

使用PKiD再次確認(rèn)

脫殼

環(huán)境

安卓8.1+fs128arm64+pyenv local 3.8.2

adb install 摩托邦4.8.0.2021070601.apk

FRIDA-DEXDump

對于完整的 dex，采用暴力搜索 DEX.035 即可找到。而對于抹頭的 dex，通過匹配一些特征來找到。FRIDA-DEXDump純粹的利用特征從內(nèi)存中檢索已經(jīng)加載的 DEX 文件，而不需要攔截任何的函數(shù)得到一些結(jié)構(gòu)體，并從中獲取 DEX 的內(nèi)存地址或其他相關(guān)信息。

git clone https://github.com/hluwa/FRIDA-DEXDump.git 支持搜索沒有文件頭的 DEX 文件 python main.py 前臺運行需要脫殼的app，將dump下的dex放到j(luò)adx-1.2.0中反編譯

FART

在設(shè)置中找到需要脫殼的應(yīng)用配置sdcard存儲空間權(quán)限，否則只能存到var savepath = "/data/data/com.motoband";首先拷貝fart.so和fart64.so到/data/app目錄下(權(quán)限不足就先放到/data/local/tmp再轉(zhuǎn)移目錄)，并使用chmod 777 設(shè)置好權(quán)限

frida_fart_reflection.js

用反射的方式實現(xiàn)的函數(shù)粒度的脫殼，與使用hook方式實現(xiàn)的方法不同,可以使用spawn和attach兩種方式使用

調(diào)用dump(classname),傳入要處理的類名，只完成對某一個類下的所有函數(shù)的CodeItem完成dump，效率更高，dump下來的類函數(shù)的所有CodeItem在含有類名的bin文件中

frida_fart_hook.js

使用hook的方式實現(xiàn)的函數(shù)粒度的脫殼，僅僅是對類中的所有函數(shù)進(jìn)行了加載，但依然可以解決絕大多數(shù)的抽取保護(hù),需要以spawn方式啟動app，等待app進(jìn)入Activity界面后，執(zhí)行fart()函數(shù)即可

如果發(fā)現(xiàn)某個類中的函數(shù)的CodeItem沒有dump下來，可以調(diào)用dump(classname),傳入要處理的類名，完成對該類下的所有函數(shù)體的dump,dump下來的函數(shù)體會追加到bin文件當(dāng)中

git clone https://github.com/hanbinglengyue/FART.git frida -UF -l frida_fart_reflection.js frida -U -f com.motoband -l frida_fart_reflection.js --no-pause frida -U -f com.motoband -l frida_fart_hook.js --no-pause mv dex /sdcard/com.motoband/ 在使用愛莫助手下載

Youpk

僅限機型pixel 1代，效果最好，脫的褲衩都沒了

7z x Youpk_sailfish.zip adb reboot bootloader cd sailfish-nzh54d && sh flash-all.sh

安裝apk后在Settings-Apps-摩托邦-Permissions啟動存儲權(quán)限

adb shell "echo com.motoband >> /data/local/tmp/unpacker.config" 啟動apk等待脫殼,每隔10秒將自動重新脫殼(已完全dump的dex將被忽略), 當(dāng)日志打印unpack end時脫殼完成 adb pull /data/data/com.motoband/unpacker pull出dump文件, dump文件路徑為 /data/data/包名/unpacker java -jar dexfixer.jar /data/data/com.motoband/unpacker /data/data/com.motoband/output 調(diào)用修復(fù)工具 dexfixer.jar, 兩個參數(shù), 第一個為dump文件目錄(必須為有效路徑), 第二個為重組后的DEX目錄(不存在將會創(chuàng)建)adb install wifiadb.apk adb tcpip 5555 免root執(zhí)行tcpip調(diào)試模式 adb connect 172.20.103.254:5555

適用場景

整體加固

抽取:

nop占坑型(類似某加密)
naitve化, 在<clinit>中解密(類似早期阿里)
goto解密型(類似新版某加密?najia)

AUPK

抓包

charles+postern

SSL handshake with client failed: An unknown issue occurred processing the certificate (certificate_unknown)看起來做了證書綁定，使用r0capture開啟dump證書也未dump下來，無法正常抓包

./fs1280arm64 啟動frida，netstat -tnlp|grep 27042 查看占用端口

frida_ssl_logger

核心原理就是對SSL_read和SSL_write進(jìn)行hook，得到其收發(fā)包的明文數(shù)據(jù)

python ssl_logger.py -U -f com.motoband python ssl_logger.py -U -f com.motoband -p motoband.pcap 生成的pcap通過wireshark打開

OkHttpLogger-Frida

由于所有使用的okhttp框架的App發(fā)出的請求都是通過RealCall.java發(fā)出的，那么我們可以hook此類拿到request和response,也可以緩存下來每一個請求的call對象，進(jìn)行再次請求，所以選擇了此處進(jìn)行hook

adb push okhttpfind.dex /data/local/tmp frida -U -l okhttp_poker.js -f com.motoband --no-pause 可追加 -o [output filepath]保存到文件

判斷是否混淆，如果混淆需要修改okhttp_poker.js中的混淆后的變量

開啟抓包

r0capture

./fs14216arm64 pyenv local 3.9.0

adb shell dumpsys activity activities 查看前臺app包名 python r0capture.py -U -f com.motoband -v python r0capture.py -U -f com.motoband -v -p motoband.pcap python r0capture.py -U -f com.motoband -v >>motoband.txt frida -U -f com.motoband -l script.js --no-pause -o motoband.txt

ctrl+shift+o獲取請求與請求頭

ctrl+shift+o獲取請求參數(shù)

拼裝到postman中

分析

通過Youpk脫下的dex一起放到j(luò)dax-1.2.0中，搜索seriesinfo

@POST("car/seriesinfo") Observable<ResponseBody> motoInfo(@Body RequestBody requestBody);

查找用例位于com.motoband.core.manager.ChooseCarManager

public Observable<MotorbikeSeriesModel> requestMotorInfo(String str, int i) {HashMap hashMap = new HashMap();hashMap.put(IntentConstants.MODELID, str);hashMap.put("source", Integer.valueOf(i));return RetrofitHelper.getObjectObservable(((ChooseCarService) RetrofitHelper.getRetrofit().create(ChooseCarService.class)).motoInfo(RetrofitHelper.getRequestBody(hashMap)), MotorbikeSeriesModel.class).observeOn(AndroidSchedulers.mainThread()).doOnNext($$Lambda$ChooseCarManager$XcbjKQVeNSK4TPlk0mzi1vIv6Z0.INSTANCE); }

顯然getRequestBody就是生成眾多加密參數(shù)的方法，位于com.motoband.core.http.RetrofitHelper

public static RequestBody getRequestBody(Map<String, Object> map) {if (map == null) {map = new HashMap<>();}long currentTimeMillis = System.currentTimeMillis();map.put("token", UserInfo.getInstance().getToken());map.put(MBRequestConstants.REQUEST_REQUESTID, CommonUtil.getRequestId(currentTimeMillis));map.put(MBRequestConstants.REQUEST_CTYPE, "2");map.put(MBRequestConstants.REQUEST_CVERSION, AppUtils.getAppVersionName());map.put("citycode", UserInfo.getInstance().getCitycode());if (!map.containsKey("userid")) {map.put("userid", UserInfo.getInstance().getUserid());}if (!map.containsKey(MBRequestConstants.REQUEST_LONLAT)) {map.put(MBRequestConstants.REQUEST_LONLAT, UserInfo.getInstance().getLonlatStr());}map.put(MBRequestConstants.REQUEST_PUSH_ID, JPushInterface.getRegistrationID(MBUtil.getContext()));ArrayList<String> arrayList = new ArrayList();for (String str : map.keySet()) {if (map.get(str) == null) {arrayList.add(str);}}for (String str2 : arrayList) {map.remove(str2);}String str3 = null;try {str3 = RSAUtil.rsaSign(EncryptUtils.encryptMD5ToString(RSAUtil.getSignContent(map)).toLowerCase(), Constants.CLIENT_PRIVATE_KEY);} catch (Exception e) {e.printStackTrace();System.out.println(MBResponseCode.RSA_SIGN_ERROR);}map.put("sign", str3);return RequestBody.create(MediaType.parse(HttpConstants.MediaType_Json), JSON.toJSONString(map)); }

多進(jìn)程保護(hù)

由于摩托邦存在多進(jìn)程保護(hù)，基于信號的發(fā)送和接收，實現(xiàn)相互的保護(hù)防止被動態(tài)攻擊。簡單的雙進(jìn)程保護(hù)就是從原進(jìn)程再fork一個空進(jìn)程出來,讓逆向分析的時候附加到空進(jìn)程中導(dǎo)致hook不上。

雙進(jìn)程進(jìn)程保護(hù)主要功能： 1、保護(hù)父進(jìn)程，ptrace所有線程，防止被附加、調(diào)試、暫停； 2、保護(hù)子進(jìn)程，防止被暫停、異常退出；

objection附加雙進(jìn)程保護(hù)的app的時候報錯,一般雙進(jìn)程保護(hù),先把app關(guān)掉直接用spwan模式就能附加上。

查看frida源碼和objection源碼：

frida附加的順序:spawn->resume->attach objection附加的順序:spawn->attach->resume

vim /root/.pyenv/versions/3.8.2/lib/python3.8/site-packages/objection/utils/agent.py 添加如下代碼debug_print('Resuming PID test `{pid}`'.format(pid=self.spawned_pid))self.device.resume(self.spawned_pid)

注釋如下代碼#if not self.exports().ping():# click.secho('Failed to ping the agent', fg='red')# raise Exception('Failed to communicate with agent')

實際就是把resume放到步驟的中間,如果不行的話適當(dāng)加個sleep就能附加上了

內(nèi)存漫游

objection -g com.motoband explore -P ~/.objection/plugins android hooking search classes com.motoband.core.manager.ChooseCarManager 搜索類 android hooking list class_methods com.motoband.core.manager.ChooseCarManager 列出類方法

plugin wallbreaker classdump com.motoband.core.http.RetrofitHelper 根據(jù)指定類dump類結(jié)構(gòu) plugin wallbreaker objectdump --fullname 0x3576 查看類的值

plugin wallbreaker classsearch com.motoband.core.http.RetrofitHelper 搜索所有相關(guān)類 plugin wallbreaker objectsearch com.motoband.core.http.RetrofitHelper$1$1 搜索內(nèi)存中指定類返回地址 plugin wallbreaker objectdump --fullname 0x2d9a 根據(jù)地址dump類所有方法

android hooking watch class_method com.motoband.core.manager.ChooseCarManager.requestMotorInfo --dump-backtrace --dump-args --dump-return hook指定方法requestMotorInfo，打印參數(shù)返回值調(diào)用棧

以上hook說明在requestMotorInfo中傳入品牌型號3334后進(jìn)入getRequestBody函數(shù)

jobs list 查看進(jìn)程中的任務(wù) jobs kill id 殺死hook任務(wù)

參數(shù)分析

根據(jù)以上Jadx中的分析，App在請求car/seriesinfo時調(diào)用了RetrofitHelper.getRequestBody(hashMap))，在函數(shù)getRequestBody中對不同參數(shù)包括token,sign等進(jìn)行了加密，并RequestBody.create(MediaType.parse(HttpConstants.MediaType_Json), JSON.toJSONString(map));最終將請求參數(shù)的HashMap轉(zhuǎn)成JSONString作為create傳遞參數(shù)。

那么即可通過主動調(diào)用getRequestBody的同時hook函數(shù)RequestBody.create拿到第二個參數(shù)作為請求參數(shù)，由于headers中數(shù)據(jù)一致，加上請求url即可完成數(shù)據(jù)抓取。

以上完成繞過so層通過主動調(diào)用和hook的方式獲取請求參數(shù)，接下來就是完成爬蟲的具體邏輯。

抓包

通過python r0capture.py -U com.motoband -v -p moto.pcap抓包分析各個頁面請求并使用python實現(xiàn)，headers可以通過請求頭加引號.py自動生成

選車列表

headers = {'Source': 'source','Date': 'Wed, 28 Jul 2021 10:42:37 GMT','Authorization': 'hmac id="AKIDKpo6me25b14nzcNefQeoqR95syh2ayx97s0g", algorithm="hmac-sha1", headers="date source", signature="LueIYYQhihnHza8ZIzzH3X1J6xM="','Content-Type': 'application/json; charset=utf-8','Content-Length': '396','Host': 'api.motuobang.com','Connection': 'Keep-Alive','Accept-Encoding': 'gzip','User-Agent': 'okhttp/3.14.9' } param_str = '{"jpushregistrationid":"18071adc03d4364a59f","ctype":"2","citycode":"0512","requestid":"10120210728184237309B6FABE44946F25C3","brandid":0,"sign":"Un9ld6EYErQmE2ab0CgGP4pbqGKz8taTYlT2d4vgJlR1e6N3vp2Ld/YHpZVHLAYQgdYxmHDPDmdPiapY/Irewg==","type":0,"cversion":"4.8.0.2021070601","userid":"53AEB07289854E91A74DA4718D86617F","token":"6A057F7AB0654DEBA3A9BAFE51A17D62","lonlat":"[120.670592,31.295319]"}'data = requests.post('http://api.motuobang.com/release/car/brandinfo', data=param_str,headers=headers).json()["data"] brandlist = json.loads(data)["brandlist"]

品牌列表

headers = {'Source': 'source','Date': 'Wed, 28 Jul 2021 11:02:48 GMT','Authorization': 'hmac id="AKIDKpo6me25b14nzcNefQeoqR95syh2ayx97s0g", algorithm="hmac-sha1", headers="date source", signature="xUe79aim7V1Nur4J8DfN9KSDU0Q="','Content-Type': 'application/json; charset=utf-8','Content-Length': '396','Host': 'api.motuobang.com','Connection': 'Keep-Alive','Accept-Encoding': 'gzip','User-Agent': 'okhttp/3.14.9' } param_str = '{"jpushregistrationid":"18071adc03d4364a59f","searchcar":"{\\"brandids\\":[28],\\"haveabs\\":0,\\"maxcc\\":0.0,\\"maxmaxpower\\":0.0,\\"maxprice\\":0,\\"maxsitheight\\":0,\\"maxxuhanglicheng\\":0,\\"maxzuigaochesu\\":0,\\"mincc\\":0.0,\\"minmaxpower\\":0.0,\\"minprice\\":0,\\"minsitheight\\":0,\\"minxuhanglicheng\\":0,\\"minzuigaochesu\\":0,\\"modelid\\":-1,\\"month\\":0,\\"pagenum\\":0,\\"pagesize\\":200,\\"searchtype\\":0,\\"source\\":0,\\"store\\":0,\\"year\\":0}","ctype":"2","citycode":"0512","requestid":"10120210728190247800B530F6E7211E0724","sign":"BeHwJ+uZ0BK7bR9z6Q4XifFqp0crBtwDouA3BxYYU7br2XQvwehJPrkfnn9MV/PezYqMawUZI6zEDiplwJ49ug==","cversion":"4.8.0.2021070601","userid":"53AEB07289854E91A74DA4718D86617F","token":"5100BF109300497C83A51614C58314FD","lonlat":"[120.67073,31.295348]"}'data = requests.post('http://api.motuobang.com/release/car/searchv2', data=param_str,headers=headers).json()["data"] print(json.loads(data)["serieslist"])

品牌詳情

headers = {'Source': 'source','Date': 'Mon, 26 Jul 2021 05:47:06 GMT','Authorization': 'hmac id="AKIDKpo6me25b14nzcNefQeoqR95syh2ayx97s0g", algorithm="hmac-sha1", headers="date source", signature="jmwgtLvjj06A/M/TNcCqL72GRsk="','Content-Type': 'application/json; charset=utf-8 ','Content-Length': '403','Host': 'api.motuobang.com','Connection': 'Keep-Alive','Accept-Encoding': 'gzip','User-Agent': 'okhttp/3.14.' } param_str = '{"jpushregistrationid":"1104a89792736fd015f","lonlat":"[120.670593,31.295318]","ctype":"2","sign":"SJxFIJSEi7BwlnPLC/6j3RfyxsR2EEEC2uWGpfC3/MQl/8gSCS5GcqSbre/S3Jrrws+/LYQzGE08T+Gv+tIIAg==","source":0,"token":"89DFF7721007455D806E282F8195B0EF","requestid":"10120210726134706717A11599A619EBCF39","citycode":"0512","cversion":"4.8.0.2021070601","userid":"53AEB07289854E91A74DA4718D86617F","modelid":"3387"}'data = requests.post('http://api.motuobang.com/release/car/seriesinfo', data=param_str,headers=headers).json()["data"] print(json.loads(data)["seriesinfo"])

frida rpc 數(shù)據(jù)傳遞

hook RequestBody.create

由于RequestBody.create(MediaType.parse(HttpConstants.MediaType_Json), JSON.toJSONString(map));，hook create即可拿到入?yún)?#61;請求頭加密參數(shù)。

function hook_body_create(){Java.perform(function(){Java.use("okhttp3.RequestBody").create.overload('okhttp3.MediaType', 'java.lang.String').implementation = function(mediaType,str){var result = this.create(mediaType,str)send(str)return result;}}) } function main(){console.log("Main")hook_body_create(); } setImmediate(main)

主動調(diào)用searchv2

查看選車列表時，搜索brandinfo

@POST("car/brandinfo") Observable<ResponseBody> refreshBrandInfo(@Body RequestBody requestBody);

查找用例com.motoband.core.manager.MotoBrandManager

android hooking watch class com.motoband.core.manager.MotoBrandManager --dump-args --dump-backtrace --dump-return 將整個類hook，點擊觸發(fā)類實現(xiàn) android hooking watch class_method com.motoband.core.manager.MotoBrandManager.requestBrandDetail --dump-args --dump-backtrace --dump-return hook觸發(fā)的類方法并拿到參數(shù)為brandid

查看品牌列表時，搜索searchv2

@POST("car/searchv2") Observable<ResponseBody> searchNewMotoModelsV2(@Body RequestBody requestBody);

查找用例時有多個方法中調(diào)用，不過只有兩個類，接下來通過objection hook上這兩個類中的所有方法，點擊指定品牌，觸發(fā)car/searchv2

android hooking watch class com.motoband.core.manager.ChooseCarManager --dump-args --dump-backtrace --dump-return android hooking watch class_method com.motoband.core.manager.ChooseCarManager.brandSeries --dump-args --dump-backtrace --dump-return

以上分析得知觸發(fā)了com.motoband.core.manager.ChooseCarManager.brandSeries方法，傳遞第一個參數(shù)為brandid，結(jié)合jadx分析

public Observable<CarFilterSearchModel> brandSeries(String str, boolean z) {HashMap hashMap = new HashMap();hashMap.put("searchcar", SearchMotoFilterModel.toBrandSeriesJson(Integer.parseInt(str), z));return RetrofitHelper.getObjectObservable(((ChooseCarService) RetrofitHelper.getRetrofit().create(ChooseCarService.class)).searchNewMotoModelsV2(RetrofitHelper.getRequestBody(hashMap)), CarFilterSearchModel.class).observeOn(AndroidSchedulers.mainThread()); }

拼接searchcar到map中，通過getRequestBody獲取加密請求參數(shù)。接下來嘗試hook SearchMotoFilterModel.toBrandSeriesJson 拿到入?yún)?#xff0c;利用frida實現(xiàn)主動調(diào)用。

function hook_searchv2(id){Java.perform(function(){var search_map = Java.use('java.util.HashMap').$new();var StringClass = Java.use("java.lang.String");var IntegerClass = Java.use("java.lang.Integer");var BooleanClass = Java.use("java.lang.Boolean");var SearchMotoFilterModel = Java.use('com.motoband.core.model.SearchMotoFilterModel').$new();// for brandinfo// search_map.put("type", IntegerClass.$new(1));// search_map.put("brandid", StringClass.$new(id));search_map.put("searchcar",SearchMotoFilterModel.toBrandSeriesJson(id,false));var RetrofitHelper = Java.use("com.motoband.core.http.RetrofitHelper");RetrofitHelper.getRequestBody(search_map);}) }

主動調(diào)用serials_info

查看品牌詳情時，搜索seriesinfo

@POST("car/seriesinfo") Observable<ResponseBody> motoInfo(@Body RequestBody requestBody);

查找用例

hook實現(xiàn)

function hook_seriesinfo(id){Java.perform(function(){var map = Java.use('java.util.HashMap').$new();var StringClass = Java.use("java.lang.String");map.put("modelid", StringClass.$new(id));var RetrofitHelper = Java.use("com.motoband.core.http.RetrofitHelper");RetrofitHelper.getRequestBody(map);}) }

rpc調(diào)用

frida主動調(diào)用各個方法時，同時間hook RequestBody.create方法，拿到關(guān)鍵加密參數(shù)，rpc發(fā)送給python，完成爬蟲數(shù)據(jù)拼裝，實現(xiàn)數(shù)據(jù)抓取。

rpc.exports = {hookseriesinfo: hook_seriesinfo,hooksearchv2: hook_searchv2,hookbodybreate: hook_body_create }

python

device = frida.get_usb_device() # pid = device.spawn(["com.motoband"]) # device.resume(pid) # time.sleep(10) session = device.attach("com.motoband") with open("motoband.js") as f:script = session.create_script(f.read()) script.on("message", my_message_handler) script.load()# request for brandinfo headers = {'Source': 'source','Date': 'Wed, 28 Jul 2021 10:42:37 GMT','Authorization': 'hmac id="AKIDKpo6me25b14nzcNefQeoqR95syh2ayx97s0g", algorithm="hmac-sha1", headers="date source", signature="LueIYYQhihnHza8ZIzzH3X1J6xM="','Content-Type': 'application/json;*/jg charset=utf-8','Content-Length': '396','Host': 'api.motuobang.com','Connection': 'Keep-Alive','Accept-Encoding': 'gzip','User-Agent': 'okhttp/3.14.9' } param_str = '{"jpushregistrationid":"18071adc03d4364a59f","ctype":"2","citycode":"0512","requestid":"10120210728184237309B6FABE44946F25C3","brandid":0,"sign":"Un9ld6EYErQmE2ab0CgGP4pbqGKz8taTYlT2d4vgJlR1e6N3vp2Ld/YHpZVHLAYQgdYxmHDPDmdPiapY/Irewg==","type":0,"cversion":"4.8.0.2021070601","userid":"53AEB07289854E91A74DA4718D86617F","token":"6A057F7AB0654DEBA3A9BAFE51A17D62","lonlat":"[120.670592,31.295319]"}' data = requests.post('http://api.motuobang.com/release/car/brandinfo', data=param_str,headers=headers).json()["data"] brandlist = json.loads(data)["brandlist"]for brand in brandlist:brandname = brand["name"]brandid = str(brand["brandid"])# 1.創(chuàng)建文件夾# 2.request for searchv2script.exports.hooksearchv2(brandid)# print(name_model_dict)# 3.request for seriesinfofor (key,value) in name_model_dict.items():# print(key+":"+str(value))script.exports.hookseriesinfo(str(value))# input()

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