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Trojan.BtcMine.1541

Added to the Dr.Web virus database: 2017-09-17

Virus description added:

SHA1:

  • SHA1: 57b6faaa192a535a0e516812483d7493fa1eb288

The Trojan-Miner designed to covertly mine cryptocurrencies using hardware of computers running Microsoft Windows.

The malicious program is spread using a dropper that is an archive with the following files:

c1deb3f794862dabb3ad7ba98cb49f0c690add5f  wDrK.dll
57b6faaa192a535a0e516812483d7493fa1eb288  wDrK.exe

The file wDrK.exe is the NSIS container, which contains two files:

dd20c396506ebf791e89bc532ed99fa92a6ba057  $1\1337\t.exe
14cb148cbcf022087f6659c209c6eeccfabf0251  $1\1337\wDrK.exe

The wDrK.exe file is a cheat for the computer game called CS:GO, the application t.exe—Trojan.BtcMine.1541.

The Trojan is packed using themida, the application is written using .NET Framework. The Trojan's configuration is hard coded into an executable file and contains data required for the correct operation of the malicious program:

Program.adm = "http://***.bege1t.tech/cmd.php";
Program.u = "****@gmail.com";
Program.pool = "stratum+tcp://xmr.pool.minergate.com:***";
Program.loggr = "https://iplogger.com/****";

The Trojan can execute the following commands:

  • Launch applications;
  • Download and launch arbitrary files via a link sent by the command and control server;
  • Self update.

Once launched, the Trojan connects to the command and control server to receive commands. The malicious program stores in its resources an injector and then unpacks and launches it.

The miner’s injector is an executable MZPE file compiled using MinGW. Its main task is to inject the miner into the Windows process. The injector searches in its file for the resource called STUB and decrypts it. Then it receives the name of the current process and launches one more copy with the CREATE_SUSPENDED flag. After that it injects into this process the encrypted miner’s image.

In the injector’s code there is a string to launch the miner:

0 --max-cpu-usage=50 --donate-level=1 -o stratum+tcp://xmr.pool.minergate.com:45560 -u ****@ya.ru -p x

However, the injector does not send to the child’s process any startup arguments, so right after its start the miner automatically shuts down.

The miner is designed to mine the Monero (XMR) cryptocurrency and is implemented as XMRig CPU Miner.

Curing recommendations

  1. If the operating system (OS) can be loaded (either normally or in safe mode), download Dr.Web Security Space and run a full scan of your computer and removable media you use. More about Dr.Web Security Space.
  2. If you cannot boot the OS, change the BIOS settings to boot your system from a CD or USB drive. Download the image of the emergency system repair disk Dr.Web® LiveDisk , mount it on a USB drive or burn it to a CD/DVD. After booting up with this media, run a full scan and cure all the detected threats.
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After booting up, run a full scan of all disk partitions with Dr.Web Anti-virus for Linux.

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  1. If the mobile device is operating normally, download and install Dr.Web for Android. 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 for Android 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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