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Mythen

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Android.DownLoader.3974

Added to the Dr.Web virus database: 2018-12-04

Virus description added: 2018-12-04

Technical information

Malicious functions:

Downloads the following detected threats from the Internet:

Android.DownLoader.136.origin

Network activity:

Connects to:

UDP(DNS) <Google DNS>
TCP(HTTP/1.1) app.w####.cn:80
TCP(HTTP/1.1) oss.aliy####.com:80
TCP(HTTP/1.1) ap####.w####.cn.####.com:80
TCP(HTTP/1.1) h####.b####.com:80

DNS requests:

ap####.w####.cn
app.w####.cn
app.w####.cn
h####.b####.com
oss.aliy####.com

HTTP GET requests:

ap####.w####.cn.####.com/appfile/sdk/AppOffer_dex_2.1.1d.jar
app.w####.cn/action/api/down
app.w####.cn/action/api/down?app_id=####&cver=####&sver=####
oss.aliy####.com/tdx-version/helper/tdx-version.xml
oss.aliy####.com/tdx-version/helper/version.obb

HTTP POST requests:

h####.b####.com/app.gif

File system changes:

Creates the following files:

/data/data/####/.md5
/data/data/####/.sec_version
/data/data/####/__Baidu_Stat_SDK_SendRem.xml
/data/data/####/__local_last_session.json
/data/data/####/__local_stat_cache.json
/data/data/####/classes.dex
/data/data/####/classes.jar
/data/data/####/com.tdx.roothelper
/data/data/####/com.tdx.roothelper.art
/data/data/####/com.tdx.roothelper_preferences.xml
/data/data/####/com.tdx.roothelper_preferences.xml.bak
/data/data/####/container.dex
/data/data/####/container.pre_global_config
/data/data/####/device_id.xml.xml
/data/data/####/libsecexe.x86.so
/data/data/####/libsecmain.x86.so
/data/media/####/.cuid
/data/media/####/version.obb

Miscellaneous:

Executes the following shell scripts:

<Package> <Package> -1829720904 0 /data/app/<Package>-1.apk 41 <Package> 50 51
chmod 755 <Package Folder>/.cache/<Package>
chmod 755 <Package Folder>/.cache/<Package>.art
getprop ro.build.host
getprop ro.product.cpu.abi
sh
su

Loads the following dynamic libraries:

libsecexe.x86

Uses the following algorithms to encrypt data:

AES-CBC-PKCS5Padding
AES-ECB-PKCS5Padding

Uses the following algorithms to decrypt data:

AES

Uses elevated priveleges.

Uses special library to hide executable bytecode.

Gets information about network.

Gets information about phone status (number, IMEI, etc.).

Gets information about installed apps.

Displays its own windows over windows of other apps.

Curing recommendations

Android

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.
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.

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