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Android.BackDoor.2943

Added to the Dr.Web virus database: 2021-08-13

Virus description added: 2021-08-13

Technical information

Malicious functions:

Executes code of the following detected threats:

Android.BackDoor.325
Android.Backdoor.547.origin

Network activity:

Connects to:

UDP(DNS) <Google DNS>
TCP(HTTP/1.1) a####.u####.com.####.com:80
TCP(HTTP/1.1) i####.cn.com:80
TCP(TLS/1.0) gv1.x####.com:443

DNS requests:

a####.u####.com
cl.mo####.u####.com
gv1.x####.com
i####.cn.com
mt####.go####.com
pg.x####.com

HTTP GET requests:

i####.cn.com/a/3fc2a1053f475ae10e1f2398394c52ecb

HTTP POST requests:

a####.u####.com.####.com/app_logs

File system changes:

Creates the following files:

/data/data/####/.imprint
/data/data/####/1.apk
/data/data/####/2.apk
/data/data/####/3fc2a1053f475ae10e1f2398394c52ecb;account_file.xml
/data/data/####/Alvin2.xml
/data/data/####/ContextData.xml
/data/data/####/MF_CFG
/data/data/####/MF_CFG-journal
/data/data/####/TD_app_pefercen_profile.xml
/data/data/####/cc.db
/data/data/####/cc.db-journal
/data/data/####/classes.dex
/data/data/####/e77c5f93-cb55-4fbe-b8de-4c300622c61d.zip
/data/data/####/exchangeIdentity.json
/data/data/####/exid.dat
/data/data/####/initdata.xml
/data/data/####/myfvu.dex (deleted)
/data/data/####/myfvu.jar
/data/data/####/paylib.dex
/data/data/####/paylib.jar
/data/data/####/pref_file.xml
/data/data/####/talkingdata_app.db
/data/data/####/talkingdata_app.db-journal
/data/data/####/talkingdata_app_process_preferences_file
/data/data/####/talkingdata_app_version_preferences_file
/data/data/####/td_database_push
/data/data/####/td_pefercen_profile.xml
/data/data/####/tdandroidgame
/data/data/####/tdid.xml
/data/data/####/tmp.dat
/data/data/####/ua.db
/data/data/####/ua.db-journal
/data/data/####/umeng_general_config.xml
/data/data/####/umeng_it.cache
/data/data/####/vi_db_pay
/data/data/####/vi_db_pay-journal
/data/data/####/webview.db
/data/data/####/webview.db-journal
/data/media/####/.acterr
/data/media/####/.tcookieid
/data/media/####/Alvin2.xml
/data/media/####/ContextData.xml
/data/media/####/crash-2021-08-13-1628871819926.log

Miscellaneous:

Loads the following dynamic libraries:

apk_t_shirt
cocos2dcpp

Uses the following algorithms to encrypt data:

AES-CBC-PKCS5Padding
AES-CBC-PKCS7Padding

Uses the following algorithms to decrypt data:

AES-CBC-PKCS5Padding

Accesses the ITelephony private interface.

Gets information about location.

Gets information about network.

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

Adds tasks to the system scheduler.

Displays its own windows over windows of other apps.

Gets information about sent/received SMS.

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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