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Android.Backdoor.1803

Added to the Dr.Web virus database: 2018-10-15

Virus description added: 2018-10-15

Technical information

Malicious functions:

Executes code of the following detected threats:

Android.Backdoor.627.origin
Android.Backdoor.682.origin
Android.Click.272.origin

Network activity:

Connecting to:

UDP(DNS) <Google DNS>
TCP(HTTP/1.1) a####.u####.com:80
TCP(HTTP/1.1) appjoyr####.cn:7931
TCP(HTTP/1.1) appjoyr####.cn:9336

DNS requests:

a####.u####.com
appjoyr####.cn

HTTP POST requests:

a####.u####.com/app_logs
appjoyr####.cn:7931/at/config
appjoyr####.cn:7931/at/pl
appjoyr####.cn:7931/at/sevHost
appjoyr####.cn:9336/log/biz

Modified file system:

Creates the following files:

/data/anr/traces.txt
/data/data/####/.imprint
/data/data/####/009304d3fd25f2fbf7ab1bc955f7648b.jar
/data/data/####/1260456045.dex (deleted)
/data/data/####/1260456045.jar
/data/data/####/2078793401
/data/data/####/29af77cbca150d6406bf1243205eb743.apk
/data/data/####/650156996.jar
/data/data/####/9537f2ad5eb87476e7727193fd87e58a.apk
/data/data/####/DataEvent_990343231.xml
/data/data/####/SqlDataContainer
/data/data/####/SqlDataContainer-journal
/data/data/####/amplify
/data/data/####/base.so
/data/data/####/cc.db
/data/data/####/cc.db-journal
/data/data/####/exchangeIdentity.json
/data/data/####/exid.dat
/data/data/####/global.xml
/data/data/####/island.db-journal
/data/data/####/ua.db
/data/data/####/ua.db-journal
/data/data/####/umeng_general_config.xml
/data/data/####/umeng_it.cache
/data/data/####/web2285.temp
/data/data/####/web2306.temp
/data/data/####/webview.db-journal
/data/media/####/3f9b6e47f232cc352a3ce779ba46ce90.xml
/data/media/####/64266cae9b2412e6d30247bddd9ef634.xml
/data/media/####/69cb27ee6d36e1ed0c0869c94d1c657b_40.69
/data/media/####/cfg.xml
/data/media/####/global.xml
/data/media/####/sysid.dat
/data/media/####/webadlist_1.cache
/data/media/####/webadlist_1.xml
/data/media/####/webadlist_1_last.cache
/data/media/####/webinfo.xml

Miscellaneous:

Executes next shell scripts:

/system/bin/cat /proc/cpuinfo

Loads the following dynamic libraries:

base

Uses the following algorithms to encrypt data:

AES-CBC-PKCS7Padding
DES-ECB-NoPadding
Des-ECB-NoPadding

Uses the following algorithms to decrypt data:

AES-CBC-PKCS7Padding
DES-ECB-NoPadding
Des-ECB-NoPadding

Gains access to network information.

Gains access to telephone information (number, imei, etc.).

Gains access to information about installed applications.

Displays its own windows over windows of other applications.

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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