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Android.DownLoader.4221

Added to the Dr.Web virus database: 2019-03-11

Virus description added: 2019-03-11

Technical information

Malicious functions:

Executes code of the following detected threats:

Android.Xiny.1792
Android.Xiny.20

Downloads the following detected threats from the Internet:

Android.Xiny.20

Network activity:

Connects to:

UDP(DNS) <Google DNS>
TCP(HTTP/1.1) img.cool####.cn:80
TCP(HTTP/1.1) s.un####.com:80
TCP(HTTP/1.1) a.appj####.com:80
TCP(TLS/1.0) ssl.google-####.com:443
TCP(TLS/1.0) googl####.g.doublec####.net:443
TCP(TLS/1.0) 1####.217.168.206:443
TCP(TLS/1.0) and####.cli####.go####.com:443

DNS requests:

a.appj####.com
and####.cli####.go####.com
googl####.g.doublec####.net
img.cool####.cn
s.un####.com
ssl.google-####.com

HTTP GET requests:

img.cool####.cn/2011/znli191.jar

HTTP POST requests:

a.appj####.com/ad-service/ad/mark
s.un####.com/cw/cp.action?requestId=####&g=####
s.un####.com/cw/interface!u2.action?protocol=####&version=####

File system changes:

Creates the following files:

/data/data/####/.jg.ic
/data/data/####/ApplicationCache.db-journal
/data/data/####/W_Key.xml
/data/data/####/ads196783387.jar
/data/data/####/data_0
/data/data/####/data_1
/data/data/####/data_2
/data/data/####/data_3
/data/data/####/dict
/data/data/####/dict-journal
/data/data/####/downloadswc
/data/data/####/downloadswc-journal
/data/data/####/f_000001
/data/data/####/f_000002
/data/data/####/favorite.db-journal
/data/data/####/gaClientId
/data/data/####/google_analytics_v4.db-journal
/data/data/####/https_googleads.g.doubleclick.net_0.localstorage-journal
/data/data/####/index
/data/data/####/jg_app_update_settings_random.xml
/data/data/####/libjiagu.so
/data/data/####/pref.xml
/data/data/####/record.db
/data/data/####/record.db-journal
/data/data/####/st.xml
/data/data/####/webview.db-journal
/data/data/####/webviewCookiesChromium.db-journal
/data/media/####/3.5_znli191.jar.tmp
/data/media/####/assetstime.dat

Miscellaneous:

Executes the following shell scripts:

chmod 755 <Package Folder>/files/libjiagu.so

Loads the following dynamic libraries:

jg
libjiagu

Uses the following algorithms to decrypt data:

AES-CBC-PKCS5Padding

Uses special library to hide executable bytecode.

Gets information about network.

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

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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