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Trojan.BtcMine.1369

Added to the Dr.Web virus database: 2017-07-17

Virus description added:

SHA 1:

  • d534e89e3795781e0e116e482fa4efb46b188a0d

A Trojan program intended for mining cryptocurrencies. It is installed on servers run on Microsoft Windows Server using a vulnerability in Cleverence Mobile SMARTS Server via the RDP protocol.

It is a dynamic library (DLL) having 5 exports:

1  .00000001`800029D0 Install
2  .00000001`80001690 ServiceMain
3  .00000001`800025C0 Stealth
4  .00000001`80001F40 Test
5  .00000001`80002DD0 Uninstall

Having the unauthorized access to the server, cybercriminals save the library to the directory %TEMP% and run it using rundll32:

2017-Jul-19 10:33:07.011857 [5320] [INF] [1600] [arkdll] 
id: 49444, timestamp: 10:33:07.011, type: PsCreate (16), flags: 1 (wait: 1), cid: 8380/10700:\Device\HarddiskVolume2\Windows\System32\cmd.exe
  source context: start addr: 0x7ff64f886e20, image: 0x7ff64f880000:\Device\HarddiskVolume2\Windows\System32\cmd.exe
  created process: \Device\HarddiskVolume2\Windows\System32\cmd.exe:8380 --> \Device\HarddiskVolume2\Windows\System32\rundll32.exe:12920
  bitness: 64, ilevel: high, sesion id: 15, type: 0, reason: 1, new: 1, dbg: 0, wsl: 0
  curdir: C:\Windows\system32\, cmd: rundll32  Inject.dll,Stealth SPB06
  status: signed_microsoft, system_file_host, spc / signed_microsoft / clean
id: 49444 ==> allowed [2], time: 0.739863 ms

Export Install

In the Windows Server system registry, it creates the key [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Svchost], saves the string "WdiServerHost” to the field “netsvcs”; the string is then used as the name of the Trojan service. It creates the service "WdiServerHost” with the displayed name “Diagnostic server host” and the following description:

The Diagnostic server host is used by the diagnostic policy service to host diagnostic tools run in the local system. If this service is stopped, some diagnostic tools, which depend on this service, will not function.

The service is launched automatically, "%%SystemRoot%%\system32\svchost.exe -k netsvcs” is specified as the executed file. Then, using the system registry branch "%%SystemRoot%%\system32\svchost.exe -k netsvcs” and the parameter “ServiceDll” the Trojan writes its name as the library loaded by the service. For the "ServiceDllUnloadOnStop” parameter, the value “1” is set, and then the service is run.

Export Stealth

It gets privileges "SeBackupPrivilege" and "SeRestorePrivilege". It reads the value of the "netsvcs” parameter of the system registry key [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Svchost]. If the value is empty, it finishes.

It scans the system services listed in "netsvcs” to find a service with the launch type set as SERVICE_DEMAND_START or SERVICE_DISABLED. If the required service is found, it copies the creation, change and access time of the file indicated in the service ServiceDll, deletes the original file of the service and replaces it by its own copy setting the creation, change and access time as in the original file. It saves the input parameter in “ServiceWorker”. Then, it sets the automatic start for the service and runs it.

Export ServiceMain

It gets the "SeDebugPrivilege” privilege. It gets the address of the function "NtSetInformationProcess” from ntdll.dll and sets the critical flag for its process. It seeks a disk with the DRIVE_FIXED parameter and selects the first directory on it. If the directory name in the lowercase does not match “$recycle.bin”, it extracts files from its own resources and saves them to this directory:

screenshot Trojan.BtcMine #drweb

It gets the "SeDebugPrivilege” privilege. It gets the address of the function "NtSetInformationProcess” from ntdll.dll and sets the critical flag for its process. It seeks a disk with the DRIVE_FIXED parameter and selects the first directory on it. If the directory name in the lowercase does not match “$recycle.bin”, it extracts files from its own resources and saves them to this directory:

screenshot Trojan.BtcMine #drweb

If there is at least one running server, the Trojan runs the miner stored in the svchost.exe file with the following parameters:

-t %d -a cryptonight -o stratum+tcp://%s -O 4JUdGzvrMFDWrUUwY3toJATSeNwjn54LkCnKBPRzDuhzi5vSepHfUckJNxRL2gjkNrSqtCoRUrEDAgRwsQvVCjZbS15Y5w6TATZ1WR7Tke.%s:x

Parameters are as follows:

  • Number of kernels;
  • Runing server’s address;
  • The string saved in the ServiceWorkers parameter of the Trojan service.

The string saved in the ServiceWorkers parameter of the Trojan service.

Export Test

It performs the same actions as Export Stealth, but replaces with its copy not one service, but all services that match the set parameters.

Export Uninstall

It deletes the "WdiServerHost” service.

Curing

Since the Trojan replaces one of the Windows Server system services, it is cured in several stages.

  1. Scan the infected server using the Dr.Web Antivirus or the Dr.Web CureIt! utility and confirm the suggestion of the antivirus to cure infected files.
  2. Restart the server. To recover the system library deleted by the Trojan, run the following command in the console:
    sfc /scannow
    
  3. Restart the server again.
  4. Install security updates released by the Cleverence Mobile SMARTS Serve developer, which cover the vulnerability of the application.
  5. It is recommended that the outside network access to the Cleverence Mobile SMARTS Server software is restricted.
  6. Change passwords for all user accounts on your server.

News about the Trojan

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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  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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