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Added to the Dr.Web virus database: 2019-09-24

Virus description added:

Technical Information

Malicious functions
To complicate detection of its presence in the operating system,
deletes volume shadow copies.
Modifies file system
Creates the following files
  • %TEMP%\a71c8b72.buran
Deletes the following files
  • %TEMP%\a71c8b72.buran
Network activity
Creates and executes the following
  • '<SYSTEM32>\cmd.exe' /C bcdedit /set {default} bootstatuspolicy ignoreallfailures' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C wevtutil.exe clear-log Security' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C wevtutil.exe clear-log Application' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C del "%userprofile%\documents\Default.rdp"' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C attrib "%userprofile%\documents\Default.rdp" -s -h' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C reg add "HKEY_CURRENT_USER\Software\Microsoft\Terminal Server Client\Servers"' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C reg delete "HKEY_CURRENT_USER\Software\Microsoft\Terminal Server Client\Servers" /f' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C wevtutil.exe clear-log System' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C reg delete "HKEY_CURRENT_USER\Software\Microsoft\Terminal Server Client\Default" /va /f' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C wmic shadowcopy delete' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C wbadmin delete backup' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C wbadmin delete systemstatebackup -keepversions:0' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C wbadmin delete systemstatebackup' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C wbadmin delete catalog -quiet' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C bcdedit /set {default} recoveryenabled no' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C vssadmin delete shadows /all /quiet' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C sc config eventlog start=disabled' (with hidden window)
Executes the following
  • '<SYSTEM32>\cmd.exe' /C bcdedit /set {default} bootstatuspolicy ignoreallfailures
  • '<SYSTEM32>\cmd.exe' /C wevtutil.exe clear-log System
  • '<SYSTEM32>\cmd.exe' /C wevtutil.exe clear-log Security
  • '<SYSTEM32>\cmd.exe' /C wevtutil.exe clear-log Application
  • '<SYSTEM32>\cmd.exe' /C del "%userprofile%\documents\Default.rdp"
  • '<SYSTEM32>\attrib.exe' "%HOMEPATH%\documents\Default.rdp" -s -h
  • '<SYSTEM32>\cmd.exe' /C attrib "%userprofile%\documents\Default.rdp" -s -h
  • '<SYSTEM32>\reg.exe' add "HKEY_CURRENT_USER\Software\Microsoft\Terminal Server Client\Servers"
  • '<SYSTEM32>\cmd.exe' /C reg add "HKEY_CURRENT_USER\Software\Microsoft\Terminal Server Client\Servers"
  • '<SYSTEM32>\reg.exe' delete "HKEY_CURRENT_USER\Software\Microsoft\Terminal Server Client\Servers" /f
  • '<SYSTEM32>\cmd.exe' /C reg delete "HKEY_CURRENT_USER\Software\Microsoft\Terminal Server Client\Servers" /f
  • '<SYSTEM32>\reg.exe' delete "HKEY_CURRENT_USER\Software\Microsoft\Terminal Server Client\Default" /va /f
  • '<SYSTEM32>\cmd.exe' /C reg delete "HKEY_CURRENT_USER\Software\Microsoft\Terminal Server Client\Default" /va /f
  • '<SYSTEM32>\cmd.exe' /C vssadmin delete shadows /all /quiet
  • '<SYSTEM32>\cmd.exe' /C wmic shadowcopy delete
  • '<SYSTEM32>\cmd.exe' /C wbadmin delete backup
  • '<SYSTEM32>\cmd.exe' /C wbadmin delete systemstatebackup -keepversions:0
  • '<SYSTEM32>\cmd.exe' /C wbadmin delete systemstatebackup
  • '<SYSTEM32>\cmd.exe' /C wbadmin delete catalog -quiet
  • '<SYSTEM32>\cmd.exe' /C bcdedit /set {default} recoveryenabled no
  • '<SYSTEM32>\cmd.exe' /C sc config eventlog start=disabled
  • '<SYSTEM32>\sc.exe' config eventlog start=disabled

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.
Download Dr.Web

Download by serial number

Use Dr.Web Anti-virus for macOS to run a full scan of your Mac.

After booting up, run a full scan of all disk partitions with Dr.Web Anti-virus for Linux.

Download Dr.Web

Download by serial number

  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.

Find out more about Dr.Web for Android