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Android.Gexin.987

Added to the Dr.Web virus database: 2021-05-01

Virus description added: 2021-05-01

Technical information

Malicious functions:

Executes code of the following detected threats:

Android.Gexin.1

Network activity:

Connects to:

UDP(DNS) 8####.8.4.4:53
TCP(HTTP/1.1) a####.u####.com.####.com:80
TCP(HTTP/1.1) s####.milian####.com:80
TCP(HTTP/1.1) m.tanl####.com:80
TCP(HTTP/1.1) c.appj####.com:80
TCP(TLS/1.0) safebro####.google####.com:443
TCP(TLS/1.0) and####.cli####.go####.com:443
TCP(TLS/1.0) p####.google####.com:443
TCP(TLS/1.0) 1####.217.17.42:443
TCP(TLS/1.2) 1####.250.179.195:443
TCP(TLS/1.2) 2####.58.214.14:443
TCP sdk.o####.t####.####.com:5224
TCP cm-1####.g####.com:5225

DNS requests:

a####.u####.com
and####.cli####.go####.com
api.tanl####.com
api.tanl####.com.####.8
c.appj####.com
cm-1####.g####.com
cm-1####.g####.com
m####.go####.com
m.tanl####.com
p####.google####.com
s####.milian####.com
safebro####.google####.com
sdk.o####.p####.####.com
sdk.o####.t####.####.com

HTTP GET requests:

m.tanl####.com/favicon.ico
m.tanl####.com/members/register
s####.milian####.com/api/count?sex=####&app=####&action=####&user=####&c...

HTTP POST requests:

a####.u####.com.####.com/app_logs
c.appj####.com/ad/splash/stats.html

File system changes:

Creates the following files:

/data/data/####/.imprint
/data/data/####/.jg.ic
/data/data/####/.old_file_converted
/data/data/####/Cookies-journal
/data/data/####/WebViewChromiumPrefs.xml
/data/data/####/__local_last_session.json
/data/data/####/ad_show_time.xml
/data/data/####/c321d07198593bd6_0
/data/data/####/classes.dex
/data/data/####/classes.oat
/data/data/####/classes2.dex
/data/data/####/com.tjmilian.zsxq_preferences.xml
/data/data/####/eb7d7b5fbeed2fff_0
/data/data/####/filedownloader.db-journal (deleted)
/data/data/####/fresh.db
/data/data/####/fresh.db-journal
/data/data/####/increment.db-journal
/data/data/####/index
/data/data/####/init.pid
/data/data/####/jg_app_update_settings_random.xml
/data/data/####/libjiagu.so
/data/data/####/metrics_guid
/data/data/####/mi.xml
/data/data/####/mi.xml.bak
/data/data/####/mobclick_agent_online_setting_com.tjmilian.zsxq.xml
/data/data/####/push.pid
/data/data/####/pushsdk.db-journal
/data/data/####/qihoo_jiagu_crash_report.xml
/data/data/####/run.pid
/data/data/####/the-real-index
/data/data/####/tmpd8.db-journal
/data/data/####/umeng_general_config.xml
/data/data/####/umeng_general_config.xml.bak
/data/data/####/umeng_it.cache
/data/media/####/app.db
/data/media/####/com.igexin.sdk.deviceId.db
/data/media/####/com.tjmilian.zsxq.db

Miscellaneous:

Executes the following shell scripts:

/system/bin/dex2oat --instruction-set=x86 --dex-file=<Package Folder>/.jiagu/classes.dex --dex-file=<Package Folder>/.jiagu/classes2.dex --oat-file=<Package Folder>/.jiagu/classes.oat --inline-depth-limit=0 --compiler-filter=speed
chmod 755 /data/user/0/<Package>/.jiagu/libjiagu.so

Uses the following algorithms to encrypt data:

AES-CBC-PKCS7Padding
RSA

Accesses the ITelephony private interface.

Uses special library to hide executable bytecode.

Gets information about location.

Gets information about network.

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

Gets information about installed apps.

Adds tasks to the system scheduler.

Displays its own windows over windows of other apps.

Requests the system alert window permission.

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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