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Trojan.MulDrop.1528.origin

Added to the Dr.Web virus database: 2021-01-07

Virus description added:

Technical Information

To ensure autorun and distribution
Modifies the following registry keys
  • [<HKCU>\software\microsoft\windows\currentversion\run] 'dGcsAock.exe' = '%HOMEPATH%\sWcskccg\dGcsAock.exe'
  • [<HKLM>\software\Wow6432Node\microsoft\windows\currentversion\run] 'vKsMgocI.exe' = '%ALLUSERSPROFILE%\xyMcIEYk\vKsMgocI.exe'
  • [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Userinit' = '<SYSTEM32>\userinit.exe,%ALLUSERSPROFILE%\xyMcIEYk\vKsMgocI.exe,'
  • [<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Userinit' = 'userinit.exe,%ALLUSERSPROFILE%\xyMcIEYk\vKsMgocI.exe,'
Sets the following service settings
  • [<HKLM>\System\CurrentControlSet\Services\jMMkIYEF] 'Start' = '00000002'
  • [<HKLM>\System\CurrentControlSet\Services\jMMkIYEF] 'ImagePath' = '%ALLUSERSPROFILE%\hEIwUcMs\fqIEcYQM.exe'
Creates the following services
  • 'jMMkIYEF' %ALLUSERSPROFILE%\hEIwUcMs\fqIEcYQM.exe
Infects the following executable files
  • C:\far2\far.exe
  • C:\msocache\all users\{90140000-0011-0000-1000-0000000ff1ce}-c\setup.exe
  • %ALLUSERSPROFILE%\adobe\arm\s\10428\adobearmhelper.exe
  • %ALLUSERSPROFILE%\adobe\setup\{ac76ba86-7ad7-1033-7b44-ac0f074e4100}\setup.exe
Malicious functions
To complicate detection of its presence in the operating system,
forces the system hide from view:
  • hidden files
  • file extensions
blocks the following features:
  • User Account Control (UAC)
Modifies file system
Creates the following files
  • %HOMEPATH%\swcskccg\dgcsaock
  • <Current directory>\xemm.ico
  • <Current directory>\hwwc.exe
  • C:\rcxab21.tmp
  • <Current directory>\vkei.ico
  • <Current directory>\oeki.exe
  • C:\rcxb9e1.tmp
  • %ALLUSERSPROFILE%\microsoft\device stage\device\{113527a4-45d4-4b6f-b567-97838f1b04b0}\background.png.exe
  • <Current directory>\qksm.ico
  • <Current directory>\tesw.exe
  • <Current directory>\sugw.exe
  • <Current directory>\rwwc.exe
  • <Current directory>\saiw.exe
  • <Current directory>\voge.exe
  • <Current directory>\owym.exe
  • <Current directory>\bwoo.exe
  • <Current directory>\nsay.exe
  • <Current directory>\fqyu.exe
  • <Current directory>\bcmk.exe
  • C:\rcxa872.tmp
  • <Current directory>\gcsw.exe
  • <Current directory>\uaog.exe
  • %ALLUSERSPROFILE%\nicg.txt
  • %ALLUSERSPROFILE%\xymcieyk\vksmgoci
  • %HOMEPATH%\swcskccg\dgcsaock.exe
  • %ALLUSERSPROFILE%\xymcieyk\vksmgoci.exe
  • %ALLUSERSPROFILE%\heiwucms\fqiecyqm.exe
  • %WINDIR%\syswow64\config\systemprofile\swcskccg\dgcsaock
  • %TEMP%\xsgwciuq.bat
  • %TEMP%\adobearmhelper.exe
  • %TEMP%\armui.ini
  • <Current directory>\yacy.ico
  • C:\msocache\all users\{90140000-0115-0409-1000-0000000ff1ce}-c\dw20.exe.exe
  • <Current directory>\bioa.exe
  • C:\rcx9e03.tmp
  • <Current directory>\kems.ico
  • <Current directory>\nuua.exe
  • C:\rcxa20a.tmp
  • <Current directory>\acmm.ico
  • <Current directory>\wmyq.exe
  • C:\rcxa5b3.tmp
  • <Current directory>\kqey.ico
  • <Current directory>\xyeg.exe
Deletes the following files
  • %TEMP%\xsgwciuq.bat
  • <Current directory>\bcmk.exe
  • <Current directory>\fqyu.exe
  • <Current directory>\nsay.exe
  • <Current directory>\bwoo.exe
  • <Current directory>\owym.exe
  • <Current directory>\voge.exe
  • <Current directory>\saiw.exe
  • <Current directory>\rwwc.exe
  • <Current directory>\tesw.exe
  • <Current directory>\gcsw.exe
  • <Current directory>\oeki.exe
  • <Current directory>\vkei.ico
  • <Current directory>\hwwc.exe
  • <Current directory>\xemm.ico
  • <Current directory>\uaog.exe
  • <Current directory>\kqey.ico
  • <Current directory>\wmyq.exe
  • <Current directory>\acmm.ico
  • <Current directory>\nuua.exe
  • <Current directory>\kems.ico
  • <Current directory>\bioa.exe
  • <Current directory>\yacy.ico
  • %TEMP%\armui.ini
  • <Current directory>\sugw.exe
  • <Current directory>\xyeg.exe
Moves the following files
  • from C:\rcx9e03.tmp to <Current directory>\bioa.exe
  • from C:\rcxa20a.tmp to <Current directory>\nuua.exe
  • from C:\rcxa5b3.tmp to <Current directory>\wmyq.exe
  • from C:\rcxa872.tmp to <Current directory>\uaog.exe
  • from C:\rcxab21.tmp to <Current directory>\hwwc.exe
  • from C:\rcxb9e1.tmp to <Current directory>\oeki.exe
Network activity
TCP
HTTP GET requests
  • http://google.com/
  • 'bl##k.io':443
  • UDP
    • DNS ASK bl##k.io
    • DNS ASK google.com
    Miscellaneous
    Searches for the following windows
    • ClassName: '' WindowName: 'vKsMgocI.exe'
    • ClassName: '' WindowName: 'Microsoft Windows'
    • ClassName: '' WindowName: 'dGcsAock.exe'
    • ClassName: 'AcrobatSDIWindow' WindowName: ''
    • ClassName: 'AdobeAcrobat' WindowName: ''
    Creates and executes the following
    • '%HOMEPATH%\swcskccg\dgcsaock.exe'
    • '%ALLUSERSPROFILE%\xymcieyk\vksmgoci.exe'
    • '%ALLUSERSPROFILE%\heiwucms\fqiecyqm.exe'
    • '%TEMP%\adobearmhelper.exe'
    • '%WINDIR%\syswow64\reg.exe' add HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced /f /v HideFileExt /t REG_DWORD /d 1' (with hidden window)
    • '%WINDIR%\syswow64\reg.exe' add HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced /f /v Hidden /t REG_DWORD /d 2' (with hidden window)
    • '%WINDIR%\syswow64\reg.exe' add HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /d 0 /t REG_DWORD /f' (with hidden window)
    Executes the following
    • '%WINDIR%\syswow64\cmd.exe' /c %TEMP%\AdobeARMHelper.exe
    • '%WINDIR%\syswow64\reg.exe' add HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced /f /v HideFileExt /t REG_DWORD /d 1
    • '%WINDIR%\syswow64\reg.exe' add HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced /f /v Hidden /t REG_DWORD /d 2
    • '%WINDIR%\syswow64\reg.exe' add HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /d 0 /t REG_DWORD /f
    • '%CommonProgramFiles(x86)%\adobe\arm\1.0\adobearm.exe'
    • '%ProgramFiles(x86)%\adobe\acrobat reader dc\reader\reader_sl.exe'

    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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