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[转帖]某音adult_version防护分析&加密分析&邀请机制刷vip分析
发表于: 2023-1-29 22:31 8447

[转帖]某音adult_version防护分析&加密分析&邀请机制刷vip分析

熊趴趴来 活跃值
2023-1-29 22:31
8447
  1. 本文包括
    防护分析：模拟器检测、root检测、反hook、反抓包等
    加密分析：数据加密分析、身份验证的Token参数生成分析
    设备注册逻辑分析：无限获得新帐号、绑定邀请码刷vip
    b站视频链接：https://www.bilibili.com/video/BV12e411V7a5/?vd_source=23b9de401c27e819abddbd5551eddbda
    一、防护分析
    提示不能在模拟器里运行
    图片描述

定位检测代码

 

入口：com.niming.weipa.ui.splash.SplashActivity

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home.php?mod=space&uid=1892347  // com.niming.weipa.base.BaseActivity
protected void onCreate(home.php?mod=space&uid=1043391 Bundle arg2) {
 if(com.blankj.utilcode.util.e.d()) {
     com.blankj.utilcode.util.e.b(this, false);
 }
 
 super.onCreate(arg2);
 Intent v2 = this.getIntent();
 Intrinsics.checkExpressionValueIsNotNull(v2, "intent");
 if((v2.getFlags() & 0x400000) != 0) {
     this.finish();
 }

两次super到父类的onCreate函数中，查看整个启动逻辑，定位到initView函数

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@Override  // androidx.appcompat.app.AppCompatActivity
protected void onCreate(@Nullable Bundle arg5) {
 super.onCreate(arg5);
 this.supportRequestWindowFeature(1);
 /* other codes */
 this.activity = this;
 this.loadingDialogFragment = new com.niming.framework.widget.dialog.LoadingDialogFragment.a().a(true).a();
 this.pageStatusHelper = new PageStatusHelper(this, this.getPageBuilder());
 this.pageStatusHelper.a(this);
 this.init();
 this.initView(arg5); // key
}

回到SplashActivity的initView函数，发现this.m()函数

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@Override  // com.niming.weipa.base.BaseActivity
public void initView(@Nullable Bundle arg1) {
 super.initView(arg1);
 v0.d(this);
 com.blankj.utilcode.util.e.d(this, false);
 com.blankj.utilcode.util.e.a(false);
 this.m(); // key
}

进入this.m()，发现检测逻辑

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private final void m() {
     LogUtils.b("niming", new Object[]{"===AppUtils.isAppRoot():" + com.blankj.utilcode.util.c.isAppRoot() + " DeviceUtils.isDeviceRooted() " + w.isDeviceRoot()});
     if(!this.checkRoot() && !n.isEmulator(this.activity)) {
         if(this.checkProxy(this)) {
             NoticeAppDialogFragment v0 = NoticeAppDialogFragment.a("检测到您使用了代{过}{滤}理软件,不允许继续使用");
                             /* notice codes */
             v0.c(this.activity);
             return;
         }
 
         h.a().a("api_domain", "");
         this.i();
         return;
     }
 
     NoticeAppDialogFragment v0_1 = NoticeAppDialogFragment.a("检测到您使用的是模拟器或者设备已经root,不允许继续使用");
     /* notice codes */
     v0_1.c(this.activity);
 }

root检测方法

 

通过getRuntime尝试执行su命令

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public static b a(String[] arg8, String[] arg9, boolean arg10, boolean arg11) {
    StringBuilder v8_2;
    StringBuilder v11;
    StringBuilder v10_2;
    Process v9 = null;
    BufferedReader v4 = null;
    BufferedReader v5 = null;
    DataOutputStream v10 = null;
    String v1 = "";
    int v2 = -1;
    if(arg8 != null && arg8.length != 0) {
        BufferedReader v3 = null;
        try {
            Runtime v4_1 = Runtime.getRuntime();
            String v10_1 = arg10 ? "su" : "sh";
            v9 = v4_1.exec(v10_1, arg9, null);
            v10 = new DataOutputStream(v9.getOutputStream());
        }
                /* other codess */
 
        return new b(v2, v8_6, v1);
    }
 
    return new b(-1, "", "");
}

检查特定目录下的su文件是否存在

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public static boolean isDeviceRoot() {
    String[] v0 = {"/system/bin/", "/system/xbin/", "/sbin/", "/system/sd/xbin/", "/system/bin/failsafe/", "/data/local/xbin/", "/data/local/bin/", "/data/local/", "/system/sbin/", "/usr/bin/", "/vendor/bin/"};
    int v3;
    for(v3 = 0; v3 < v0.length; ++v3) {
        if(new File(v0[v3] + "su").exists()) {
            return true;
        }
    }
 
    return false;
}

emulator检测方法

 

检测系统属性

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private static final boolean c(Context arg1) {
    return "1".equals(n.a(arg1, "ro.kernel.qemu"));
}
检测特征值
 复制代码 隐藏代码
if((Build.MANUFACTURER.equals("unknown")) || (Build.MANUFACTURER.equals("Genymotion")) || (Build.MANUFACTURER.contains("Andy")) || (Build.MANUFACTURER.contains("MIT")) || (Build.MANUFACTURER.contains("nox")) || (Build.MANUFACTURER.contains("TiantianVM"))) {
    ++v15;
}
/* 很多特征值 */
if((Build.HARDWARE.equals("goldfish")) || (Build.HARDWARE.equals("vbox86")) || (Build.HARDWARE.contains("nox")) || (Build.HARDWARE.contains("ttVM_x86"))) {
    ++v15;
}
/* 很多特征值 */
if((Build.FINGERPRINT.contains("generic/sdk/generic")) || (Build.FINGERPRINT.contains("generic_x86/sdk_x86/generic_x86")) || (Build.FINGERPRINT.contains("Andy")) || (Build.FINGERPRINT.contains("ttVM_Hdragon")) || (Build.FINGERPRINT.contains("generic_x86_64")) || (Build.FINGERPRINT.contains("generic/google_sdk/generic")) || (Build.FINGERPRINT.contains("vbox86p")) || (Build.FINGERPRINT.contains("generic/vbox86p/vbox86p"))) {
    ++v15;
}

检测OPENGL的属性值
复制代码 隐藏代码
try {
String v2_1 = GLES20.glGetString(0x1F01);
if(v2_1 != null) {
if(v2_1.contains("Bluestacks")) {
goto label_260;
}
else {
boolean v2_2 = v2_1.contains("Translator");
goto label_257;
}
}
}
catch(Exception v2) {
v2.printStackTrace();
}
goto label_262;
label_257:
if(v2_2) {
v15 += 10;
goto label_262;
label_260:
v15 += 10;
}
检测共享文件夹

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try {
     label_262:
     boolean v2_4 = new File(Environment.getExternalStorageDirectory().toString() + File.separatorChar + "windows" + File.separatorChar + "BstSharedFolder").exists();
 }
catch(Exception v2_3) {
    v2_3.printStackTrace();
    n.b = v15;
    return n.b > 3;
}

处理：hook掉

 

hook失败，定位反hook代码

 

SplashActivity中没有发现相关代码，到application的app com.niming.weipa.App 的onCreate函数中寻找

 

<application android:allowBackup="true" android:appComponentFactory="androidx.core.app.CoreComponentFactory" android:icon="@drawable/icon_douying_logo" android:label="抖x" android:name="com.niming.weipa.App"
发现disableXposed函数 (名字当然是我改的...)

 

复制代码 隐藏代码

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@Override  // com.niming.framework.base_app.BaseApplication
public void onCreate() {
 super.onCreate();
 App.u0 = this;
 if(this.a(this)) {
     g1.a(this);
     this.b();
     this.c();
     com.shuyu.gsyvideoplayer.i.c.a(com.niming.weipa.d.c.class);
     com.shuyu.gsyvideoplayer.f.a.a(com.niming.weipa.d.d.class);
             /* other codes */
     com.lahm.library.d.disableXposed(); // 反hook
             /* other codes */
 }
}

查看disableXposed实现，通过反射设置disableHooks字段为true

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public boolean disableXposed() {
 try {
     Field v1_3 = ClassLoader.getSystemClassLoader().loadClass("de.robv.android.xposed.XposedBridge").getDeclaredField("disableHooks");
     v1_3.setAccessible(true);
     v1_3.set(null, Boolean.TRUE);
     return true;
 }
/* exception codes return false */
}

处理：hook掉，在函数返回后，同样使用反射将disableHooks设置为false

 

抓不到包，分析反抓包机制

 

定位反抓包代码，从app的onCreate入手

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@Override  // com.niming.framework.base_app.BaseApplication
public void onCreate() {
 super.onCreate();
 App.u0 = this;
 if(this.a(this)) {
     g1.a(this);
     this.b();
     this.c();
     com.shuyu.gsyvideoplayer.i.c.a(com.niming.weipa.d.c.class);
     com.shuyu.gsyvideoplayer.f.a.a(com.niming.weipa.d.d.class);
             /* other codes */
     com.lahm.library.d.disableXposed(); // 反hook
             /* other codes */
 }
}

进入this.c()，进行了大量关于http请求的配置，AntiCapture是我一开关注的类，后来发现这个类什么都没干；最终得出结论：抓不到包是因为设置了NO_PROXY属性，app不走系统代{过}{滤}理，因此抓不到包

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private void c() {
 HttpHeaders v0 = new HttpHeaders();
 v0.put("User-Agent", "Mozilla/5.0 (Linux; U; Android 2.1; en-us; Nexus One Build/ERD62) AppleDart/530.17 (KHTML, like Gecko) Version/4.0 Mobile Safari/530.17");
 try {
     this.t0 = new b();
     this.t0.d(30000L, TimeUnit.MILLISECONDS);
     /* other codes */
     AntiCapture v1 = a.a(); // 这里获得有关ssl证书的参数，并在下一行设置
     this.t0.a(v1.a, v1.b); // 经过分析，这两个参数都没用，并不是反抓包的实现机制
     this.t0.a(new c());
     this.t0.a(new com.niming.weipa.app.a.a());
     this.t0.a(new com.niming.weipa.app.a.b());
     /* other codes */
     this.t0.a(new ProxySelector() {
         @Override
         public void connectFailed(URI arg1, SocketAddress arg2, IOException arg3) {
         }
 
         @Override
         public List select(URI arg1) {
             /* 抓不到包的原因所在！ */
             return Collections.singletonList(Proxy.NO_PROXY);
             /* 抓不到包的原因所在！ */
         }
     });
     c.f.a.b.k().a(this).a(this.t0.a()).a(CacheMode.NO_CACHE).a(-1L).a(0).a(v0);
 }
 /* other codes */
}

处理：hook掉，在函数调用前，将参数设置为Proxy.getDefault()，默认走系统代{过}{滤}理

 

签名校验

 

生成可调试版本后，app会停在某个页面，通过查看日志发现是native层作了签名校验
我一般不分析签名校验，有兴趣可以自己分析
防护类分析

 

通过disableXposed那个函数，发现了一个很完整的java层加密类，里面实现了很多的防护函数，这里完全拷贝下来，名称我都作了修改

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package com.lahm.library;
 
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.Signature;
import android.os.Debug;
import android.os.Process;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.lang.reflect.Field;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.HashSet;
import java.util.Iterator;
 
public class i {
 static class b {
     private static final i a;
 
     static {
         b.a = new i(null);
     }
 }
 
 private static final String a = "de.robv.android.xposed.XposedHelpers";
 private static final String b = "de.robv.android.xposed.XposedBridge";
 
 private i() {
 }
 
 i(com.lahm.library.i.a arg1) {
 }
 
 public String getAppMetaData(Context arg1, String arg2) {
     return arg1.getApplicationInfo().metaData.getString(arg2);
 }
 
 public boolean isDebuggerConnected() { // 检测调试器是否连接
     return Debug.isDebuggerConnected();
 }
 
 public boolean isPortAvailable(int arg2) { // 检测端口是否被占用，可用于反调试、反hook
     try {
         return this.isNetAddressAvailable("127.0.0.1", arg2);
     }
     catch(Exception unused_ex) {
         return true;
     }
 }
 
 public boolean isApkDebuggable(Context arg1) { // 检测apk:debuggable属性是否为true
     return (arg1.getApplicationInfo().flags & 2) != 0;
 }
 
 public boolean isLibOrJarLoaded(String arg6) { // 检测加载的jar/so库
     try {
         HashSet v0 = new HashSet();
         BufferedReader v1 = new BufferedReader(new FileReader("/proc/" + Process.myPid() + "/maps"));
         while(true) {
             String v2 = v1.readLine();
             if(v2 != null) {
                 goto label_34;
             }
 
             v1.close();
             Iterator v0_1 = v0.iterator();
             while(true) {
             label_24:
                 if(!v0_1.hasNext()) {
                     return false;
                 }
 
                 Object v1_1 = v0_1.next();
                 if(!((String)v1_1).contains(arg6)) {
                     goto label_24;
                 }
 
                 return true;
             label_34:
                 if(!v2.endsWith(".so") && !v2.endsWith(".jar")) {
                     break;
                 }
 
                 v0.add(v2.substring(v2.lastIndexOf(" ") + 1));
                 break;
             }
         }
     }
     catch(Exception unused_ex) {
         return false;
     }
 }
 
 public boolean isNetAddressAvailable(String arg2, int arg3) throws UnknownHostException {
     InetAddress v2 = InetAddress.getByName(arg2); // 检测网络地址是否可用
     try {
         new Socket(v2, arg3);
         return true;
     }
     catch(IOException unused_ex) {
         return false;
     }
 }
 
 public boolean isDeviceRooted() { //检测设备是否root，里面两个函数的实现在下面
     return this.isDeviceRootedByRoSecure() == 0 ? true : this.isDeviceRootedByFile();
 }
 
 public boolean isEmulatorByBattery(Context arg4) { // 通过检查电量检测模拟器
     Intent v4 = arg4.registerReceiver(null, new IntentFilter("android.intent.action.BATTERY_CHANGED"));
     return v4 == null ? false : v4.getIntExtra("plugged", -1) == 2;
 }
 
 public String getPackageSignature(Context arg5) { // 获取签名
     try {
         Signature[] v5_1 = arg5.getPackageManager().getPackageInfo(arg5.getPackageName(), 0x40).signatures;
         StringBuilder v0 = new StringBuilder();
         int v2;
         for(v2 = 0; v2 < v5_1.length; ++v2) {
             v0.append(v5_1[v2].toCharsString());
         }
 
         return v0.toString();
     }
     catch(PackageManager.NameNotFoundException v5) {
         v5.printStackTrace();
         return "";
     }
 }
 
 public boolean isXposedExistByStack() { // 通过异常栈检测Xposed框架
     try {
         throw new Exception("gg");
     }
     catch(Exception v0) {
         StackTraceElement[] v0_1 = v0.getStackTrace();
         int v3;
         for(v3 = 0; v3 < v0_1.length; ++v3) {
             if(v0_1[v3].getClassName().contains("de.robv.android.xposed.XposedBridge")) {
                 return true;
             }
         }
 
         return false;
     }
 }
 
 @Deprecated
 public boolean isXposedExistByClassLoader() { // 通过类加载检测Xposed框架
     try {
         ClassLoader.getSystemClassLoader().loadClass("de.robv.android.xposed.XposedHelpers").newInstance();
     }
     catch(InstantiationException v0_1) {
         v0_1.printStackTrace();
         return true;
     }
     catch(IllegalAccessException v0) {
         v0.printStackTrace();
         return true;
     }
     catch(ClassNotFoundException v1) {
         v1.printStackTrace();
         return false;
     }
 
     try {
         ClassLoader.getSystemClassLoader().loadClass("de.robv.android.xposed.XposedBridge").newInstance();
         return true;
     }
     catch(InstantiationException v0_3) {
         v0_3.printStackTrace();
         return true;
     }
     catch(IllegalAccessException v0_2) {
         v0_2.printStackTrace();
         return true;
     }
     catch(ClassNotFoundException v1_1) {
         v1_1.printStackTrace();
         return false;
     }
 }
 
 public boolean isDebuggingByTarcePid() { // 通过TracePid检测程序是否出于被调试状态
     try {
         BufferedReader v1 = new BufferedReader(new FileReader("/proc/" + Process.myPid() + "/status"));
         String v2 = "";
         do {
         label_17:
             String v3 = v1.readLine();
             if(v3.contains("TracerPid")) {
                 v2 = v3.substring(v3.indexOf(":") + 1, v3.length()).trim();
             }
             else if(v3 != null) {
                 goto label_17;
             }
 
             break;
         }
         while(true);
 
         v1.close();
         return !"0".equals(v2);
     }
     catch(Exception unused_ex) {
         return false;
     }
 }
 
 public boolean disableXposed() { // disable xposed
     try {
         Field v1_3 = ClassLoader.getSystemClassLoader().loadClass("de.robv.android.xposed.XposedBridge").getDeclaredField("disableHooks");
         v1_3.setAccessible(true);
         v1_3.set(null, Boolean.TRUE);
         return true;
     }
     catch(NoSuchFieldException v1_2) {
         v1_2.printStackTrace();
         return false;
     }
     catch(ClassNotFoundException v1_1) {
         v1_1.printStackTrace();
         return false;
     }
     catch(IllegalAccessException v1) {
         v1.printStackTrace();
         return false;
     }
 }
 
 public static final i getInstance() {
     return b.a;
 }
 
 private int isDeviceDebuggable() { // ro.debuggable为1的设备可以调试任何应用，即时应用的debuggable属性为false
     String v0 = c.a().b("ro.debuggable");
     return v0 == null || !"0".equals(v0) ? 1 : 0;
 }
 
 private int isDeviceRootedByRoSecure() { // 检测ro.secure
     String v0 = c.a().b("ro.secure");
     return v0 == null || !"0".equals(v0) ? 1 : 0;
 }
 
 private boolean isDeviceRootedByFile() { // 通过文件检测设备是否root
     String[] v0 = {"/sbin/su", "/system/bin/su", "/system/xbin/su", "/data/local/xbin/su", "/data/local/bin/su", "/system/sd/xbin/su", "/system/bin/failsafe/su", "/data/local/su"};
     int v3;
     for(v3 = 0; v3 < v0.length; ++v3) {
         if(new File(v0[v3]).exists()) {
             return true;
         }
     }
 
     return false;
 }
 
}

二、加密分析
定位加密代码

 

这个app通过拦截器实现请求加密，以及携带特殊参数，通过app的onCreate，进入this.c()，接着定位到加密拦截器

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private void c() {
 HttpHeaders v0 = new HttpHeaders();
 v0.put("User-Agent", "Mozilla/5.0 (Linux; U; Android 2.1; en-us; Nexus One Build/ERD62) AppleDart/530.17 (KHTML, like Gecko) Version/4.0 Mobile Safari/530.17");
 try {
    /* other codes */
     this.t0.a(new c()); // TOKEN拦截器
     this.t0.a(new com.niming.weipa.app.a.a()); // 加密拦截器
     this.t0.a(new com.niming.weipa.app.a.b());
    /* other codes */
 }
 catch(Exception v0_1) {
     v0_1.printStackTrace();
 }
}

进入com.niming.weipa.app.a.a()，发现其中的b函数

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private b0 a(b0 arg9) {
 /* other codes */
 v1.put("data", v2);
 String v1_1 = g.a(v1);
 LogUtils.b(new Object[]{"===realParamsString: " + v1_1});
 String v1_2 = URLEncoder.encode(com.niming.weipa.utils.a.b(v1_1)); // 加密函数
 LogUtils.b(new Object[]{"===encrypt realParamsString: " + v1_2});
 new okhttp3.s.a().b("data", v1_2);
 return arg9;
}

定位到加密类com.niming.weipa.utils.a，使用AES加密，ECB模式，PKCS7的padding

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package com.niming.weipa.utils;
 
import android.text.TextUtils;
import com.blankj.utilcode.util.y;
 
public class a {
 private static String a = "";
 private static String b = "pcv#Cg1vbdl#r2hm";
 private static String c = "AES/ECB/PKCS7Padding"; // 加密算法、加密模式、padding模式
 private static String d; // 加密密钥
 
 static {
     /* other codes */
         v0 = TextUtils.equals("release", "staging") ? TestUtil.getSecretPre() : TestUtil.getSecret();
     a.d = v0;
 }
 
 public static String b(String arg3) {
     if(a.c.equals("AES/ECB/NoPadding")) {
         while(arg3.getBytes().length % 16 != 0) {
             arg3 = arg3 + ' ';
         }
     }
 
     byte[] v0 = a.d.getBytes(); // 获得密钥
     String v1 = a.c; // 加密方式
     byte[] v3 = y.k(arg3.getBytes(), v0, v1, null);
     return v3 == null ? "" : new String(v3);
 }
}

获得加密密钥

 

密钥通过native函数获得，可通过hook方式得到加密密钥

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package com.niming.weipa.utils;
public class TestUtil {
 static {
     System.loadLibrary("security");
 }
 public static native String getSecret() {
 }
 public static native String getSecret2() {
 }
 public static native String getSecret3() {
 }
 public static native String getSecretPre() {
 }
 public static native String getSecretVP() {
 }
}

验证加密算法

 

没有改动加密算法及结果，可直接通过再现网站验证

 

数据 {"data":"SaiwLbHeTk0xAbNBv8Q9cnc4os2kD8foP+3Ie57JTkc=","handshake":"v20200429"}

 

图片描述

 

三、设备注册分析
本地sqlite数据库

 

用户信息存储在本地sqlite数据库中，可以通过sqlite3或者导出数据的方式查看数据库数据，数据库路径为/data/data/package_name/database/db_name

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package com.niming.framework.basedb;
 
import android.content.Context;
import androidx.room.Database;
import androidx.room.RoomDatabase;
import androidx.room.q1;
 
@Database(entities = {e.class, a.class}, version = 1)
public abstract class BaseAppDatabase extends RoomDatabase {
 private static volatile BaseAppDatabase a;
 
 static BaseAppDatabase a(Context arg2) {
     Class v0 = BaseAppDatabase.class;
     if(BaseAppDatabase.a == null) {
         synchronized(v0) {
             if(BaseAppDatabase.a == null) {
                 BaseAppDatabase.a = (BaseAppDatabase)q1.a(arg2.getApplicationContext(), v0, "base_database").a().b();
             }
 
             return BaseAppDatabase.a;
         }
     }
 
     return BaseAppDatabase.a;
 }
}

如果本地不存在数据库以及用户信息，会触发新设备注册逻辑，可以手动删除数据库进而触发该逻辑

 

设备注册逻辑

 

首次注册设备时，向服务器发送的未加密数据格式为，其中device_no唯一标识一个设备，且在客户端生成，可以随意修改

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{"channel":"","code":"","device_no":"cd17c0a9-1d41-3377-8b3c-2599755976f8","device_type":"A","version":"4.0.5"}

在服务器返回的响应中会包含token，与device_no对应，用于生成XTOKEN请求头参数，作为用户身份标识，后续所有请求需携带该字段

 

XTOKEN认证参数生成

 

可直接通过搜索XTOKEN关键字定位到生成逻辑，很简单，通过注册设备时发送给服务器的deivce信息以及服务器返回的token信息，经序列化后加密即生成了最终的X-TOKEN

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@Override  // okhttp3.w
public d0 a(a arg6) throws IOException {
 /* other codes */
 HashMap v2 = new HashMap();
 v2.put("token", v0_3);
 v2.put("device_no", h.a().c("device_id"));
 v2.put("device_type", "A");
 v2.put("version", "4.0.5");
 JSONObject v3 = new JSONObject(v2);
 if(!TextUtils.isEmpty(v0_3)) {
     v1.a("X-TOKEN", com.niming.weipa.utils.a.b(String.valueOf(v3)));
 }
 return arg6.a(v1.a());
}

获得新帐号、绑定邀请码、获得vip

 

在以上分析的基础上，通过不同的device_no，生成相应的XTOKEN即可拥有新用户帐号，利用该app邀请码绑定送vip机制，可以获得大量用户凭证并绑定自己的邀请码，获得持续vip功能，演示可以观看bilibili视频


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最后于 2023-1-29 22:42 被熊趴趴来编辑 ，原因：
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DirtyAngle
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2 楼
我以为是抖音啊
2023-1-30 10:31
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mb_ydfxlvwf
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大致涉及到哪些工具啊，我是新手
2023-2-1 17:15
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wx_沉默的逗比
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大哥，样本哪里下载啊
2023-2-22 16:53
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