Technical Information
To ensure autorun and distribution
Modifies the following registry keys
- [<HKLM>\Software\Classes\Loki\shell\open\command] '' = '%ALLUSERSPROFILE%\gpcnkak1.exe "%l" '
Creates or modifies the following files
- %APPDATA%\microsoft\windows\start menu\programs\startup\winlogon.exe
- %APPDATA%\microsoft\windows\start menu\programs\startup\wvtymcow.bat
- <SYSTEM32>\tasks\loki
Sets the following service settings
- [<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 Defender
deletes volume shadow copies.
Executes the following
- '%WINDIR%\syswow64\netsh.exe' firewall set opmode mode=disable
Modifies file system
Creates the following files
- %APPDATA%\winlogon.exe
- %ALLUSERSPROFILE%\winlogon.exe
- %ALLUSERSPROFILE%\microsoft\windows\start menu\programs\startup\winlogon.exe
- %WINDIR%\winlogon.exe
- %TEMP%\aqxbofzd.ico
- %TEMP%\evtz0jcv.0.cs
- %TEMP%\evtz0jcv.cmdline
- %TEMP%\evtz0jcv.out
- %ALLUSERSPROFILE%\csc89c24775a9474ed693dbaf3c1d70b43b.tmp
- %TEMP%\resa3ae.tmp
- %ALLUSERSPROFILE%\gpcnkak1.exe
- %ALLUSERSPROFILE%\info.loki
Sets the 'hidden' attribute to the following files
- %APPDATA%\winlogon.exe
- %ALLUSERSPROFILE%\winlogon.exe
- %WINDIR%\winlogon.exe
- %ALLUSERSPROFILE%\gpcnkak1.exe
Deletes the following files
- %TEMP%\resa3ae.tmp
- %ALLUSERSPROFILE%\csc89c24775a9474ed693dbaf3c1d70b43b.tmp
- %TEMP%\evtz0jcv.out
- %TEMP%\evtz0jcv.0.cs
- %TEMP%\evtz0jcv.cmdline
Network activity
Connects to
- '<LOCALNET>.46.1':445
- '<LOCALNET>.46.1':139
UDP
- DNS ASK ip##pi.com
- '22#.0.0.1':9
Miscellaneous
Searches for the following windows
- ClassName: 'Static' WindowName: ''
Creates and executes the following
- '%WINDIR%\syswow64\cmd.exe' /C schtasks /CREATE /SC ONLOGON /TN Loki /TR %APPDATA%\winlogon.exe /RU SYSTEM /RL HIGHEST /F' (with hidden window)
- '%WINDIR%\microsoft.net\framework\v4.0.30319\csc.exe' /noconfig /fullpaths @"%TEMP%\evtz0jcv.cmdline"' (with hidden window)
- '%WINDIR%\microsoft.net\framework\v4.0.30319\cvtres.exe' /NOLOGO /READONLY /MACHINE:IX86 "/OUT:%TEMP%\RESA3AE.tmp" "%ALLUSERSPROFILE%\CSC89C24775A9474ED693DBAF3C1D70B43B.TMP"' (with hidden window)
- '%WINDIR%\syswow64\cmd.exe' /C vssadmin delete shadows /all /quiet' (with hidden window)
- '%WINDIR%\syswow64\cmd.exe' /C wbadmin DELETE SYSTEMSTATEBACKUP' (with hidden window)
- '%WINDIR%\syswow64\cmd.exe' /C wmic shadowcopy delete' (with hidden window)
- '%WINDIR%\syswow64\cmd.exe' /C wbadmin delete catalog -quiet' (with hidden window)
- '%WINDIR%\syswow64\cmd.exe' /C bcdedit /set {default} bootstatuspolicy ignoreallfailures' (with hidden window)
- '%WINDIR%\syswow64\cmd.exe' /C bcdedit /set {default} recoveryenabled no' (with hidden window)
- '%WINDIR%\syswow64\cmd.exe' /C netsh advfirewall set currentprofile state off' (with hidden window)
- '%WINDIR%\syswow64\cmd.exe' /C netsh firewall set opmode mode=disable' (with hidden window)
- '%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' -Command "Get-ADComputer -filter * -Searchbase '%s' | foreach{ Invoke-GPUpdate -computer $_.name -force -RandomDelayInMinutes 0}"' (with hidden window)
Executes the following
- '%WINDIR%\syswow64\cmd.exe' /C schtasks /CREATE /SC ONLOGON /TN Loki /TR %APPDATA%\winlogon.exe /RU SYSTEM /RL HIGHEST /F
- '%WINDIR%\syswow64\schtasks.exe' /CREATE /SC ONLOGON /TN Loki /TR %APPDATA%\winlogon.exe /RU SYSTEM /RL HIGHEST /F
- '%WINDIR%\microsoft.net\framework\v4.0.30319\csc.exe' /noconfig /fullpaths @"%TEMP%\evtz0jcv.cmdline"
- '%WINDIR%\microsoft.net\framework\v4.0.30319\cvtres.exe' /NOLOGO /READONLY /MACHINE:IX86 "/OUT:%TEMP%\RESA3AE.tmp" "%ALLUSERSPROFILE%\CSC89C24775A9474ED693DBAF3C1D70B43B.TMP"
- '%WINDIR%\syswow64\cmd.exe' /C vssadmin delete shadows /all /quiet
- '%WINDIR%\syswow64\cmd.exe' /C wbadmin DELETE SYSTEMSTATEBACKUP
- '%WINDIR%\syswow64\cmd.exe' /C wmic shadowcopy delete
- '%WINDIR%\syswow64\cmd.exe' /C wbadmin delete catalog -quiet
- '%WINDIR%\syswow64\cmd.exe' /C bcdedit /set {default} bootstatuspolicy ignoreallfailures
- '%WINDIR%\syswow64\cmd.exe' /C bcdedit /set {default} recoveryenabled no
- '%WINDIR%\syswow64\cmd.exe' /C netsh advfirewall set currentprofile state off
- '%WINDIR%\syswow64\cmd.exe' /C netsh firewall set opmode mode=disable
- '%WINDIR%\syswow64\netsh.exe' advfirewall set currentprofile state off
- '%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' -Command "Get-ADComputer -filter * -Searchbase '%s' | foreach{ Invoke-GPUpdate -computer $_.name -force -RandomDelayInMinutes 0}"