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Android.Loki.16.origin

Added to the Dr.Web virus database: 2016-12-09

Virus description added:

SHA1:

  • cd176f314662363af782fc539213db8f1171a664

A multicomponent Trojan for Android which is downloaded and run by other malware programs. Android.Loki.16.origin tries to get root privileges and install its components in the system catalog.

Once launched, Android.Loki.16.origin sends information about an infected device to the server. The information is sent in the JSON format, for example:

{
"chanel": "25425",
"brand":,
"model":,
"product":,
"android":,
"linux_v":,
"sdk":,
"imei":,
"imsi":,
"abi":"armeabi-v7a",
"country":"US",
"service": "ApiSs.lists",
"vd": "version 201611111348",
"vc": "3",
}

where

  • "chanel": – whole number;
  • "brand": – device manufacturer;
  • "model” – name of a device;
  • "product": – full device name;
  • “android”—operating system version;
  • “linux_v” – Linux kernel version;
  • “sdk” – SDK version of the operation system;
  • “imei” – IMEI identifier;
  • "imsi": – IMSI identifier;
  • "abi": – platform architecture;
  • "country": – user’s geolocation
  • "service": – request for a list of exploits needed to be downloaded;
  • "vd": – a version of a malware program specified in the file AndroidManifest.xml;
  • "vc": – a constant.

Sent information is compressed with the class DeflaterOutputStream and is encrypted with the AES algorithm. The server replies with a compressed and encrypted JSON file containing parameters for downloading exploits and an additional malicious module:

{
"dmd5": "AEB2053BCA56D736152884095C052328.zip", 
"dparam": "tag_test",
"durl": "http://**.***.64.76:10001/?&service=ApiKl.get",
"dtype": 0,
"list": [
{
"xurl":
"http://**.***.64.76:10001/?&service=ApiSs.get&xmd5=C9194C261C5D8E50F7BE098CBBE464AE.zip",
"xmd5": "C9194C261C5D8E50F7BE098CBBE464AE",
"xtype": 0
},
{
"xurl":
"http://**.***0.64.76:10001/?&service=ApiSs.get&xmd5=FEA7150DFACAF4887FEBD56360F7C0B9.zip",
"xmd5": "FEA7150DFACAF4887FEBD56360F7C0B9",
"xtype": 0
}
]
}

where

  • "dmd5": – a name of an archive with the malware component Android.Loki.28;
  • "durl": – a link for downloading Android.Loki.28;
  • "list": – a list of exploits needed to be downloaded.

After the exploits are downloaded and unpacked, Android.Loki.16.origin executes them one by one. The following parameters are sent:

argv[n]Value
0/data/data/<package_name>/files/sclplu/xcache/<exploit_name>
1"7e832e21a8178d83"
2System.currentTimeMillis() / 1000 % 43200
3/data/data/<package_name>/files/sclplu/xcache (catalog with exploits)
4path to Android.Loki.28
5/storage/sdcard/.googlex9/.xamdecoq0962|<google advertizing id>|<android device id>|<MAC-адрес>|<IMEI>|<channel ID
(number from the initial request of the Trojan)>|<dparam (a parameter received from the server)>

Before launch of the main code, every exploit perform the following actions:

  • Checks a number of arguments.
  • Compares the value argv[1] with a hard-coded string.
  • Verifies that the value argv[2] is in certain limits.

Then an exploit which has successfully got the root privileges creates the file crsh.sh in the catalog /data/data/<package_name>/files/sclplu/xcache. The file contains the following script which then run:

#!/system/bin/sh
<путь к Android.Loki.28> 0e7e68c92b889bed <argv[2]>
/data/data/<package_name>/files/sclplu/xcache <argv[5]> rm $0

The script, in its turn, runs Android.Loki.28.

News about the Trojan

Curing recommendations


Android

  1. 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.
  2. 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.

Find out more about Dr.Web for Android

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