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Trojan.Siggen10.48024

Added to the Dr.Web virus database: 2020-11-05

Virus description added:

Technical Information

To ensure autorun and distribution
Modifies the following registry keys
  • [<HKCU>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] '<Unknown>' = '<Full path to file>'
  • [<HKCU>\Software\Microsoft\Windows NT\CurrentVersion\Winlogon] 'shell' = 'explorer.exe,"<Full path to file>"'
  • [<HKCU>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] '<File name>.exe' = '<Full path to file>'
  • [<HKCU>\Software\Classes\ms-settings\shell\open\command] '' = ''
Creates or modifies the following files
  • %APPDATA%\microsoft\windows\start menu\programs\startup\<File name>.exe
Malicious functions
To complicate detection of its presence in the operating system,
adds antivirus exclusion with following registry keys:
  • [<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Exclusions\Paths] '%APPDATA%\Microsoft\Windows\Start Menu\Programs\Startup\<File name>.exe' = '00000000'
  • [<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Exclusions\Paths] '<Full path to file>' = '00000000'
Executes the following
  • '%WINDIR%\syswow64\netsh.exe' advfirewall firewall add rule name="Venom-ngrok" dir=in action=allow program="%APPDATA%\Venom\Venom-ngrok.exe" enable=yes
  • '%WINDIR%\syswow64\netsh.exe' advfirewall firewall add rule name="Venom-winvnc" dir=in action=allow program="%APPDATA%\Venom\Venom-winvnc.exe" enable=yes
  • '%WINDIR%\syswow64\netsh.exe' advfirewall firewall add rule name="Venom-winvnc" dir=in action=allow program="%APPDATA%\Venom\rdpinstall.exe" enable=yes
  • '%WINDIR%\syswow64\netsh.exe' advfirewall firewall add rule name="Venom-winvnc" dir=in action=allow program="%APPDATA%\Venom\ngrok.exe" enable=yes
  • '%WINDIR%\syswow64\netsh.exe' advfirewall firewall add rule name="Venom-winvnc" dir=in action=allow program="%APPDATA%\Venom\winvnc.exe" enable=yes
  • '%WINDIR%\syswow64\netsh.exe' advfirewall firewall add rule name="Windows Folder" dir=in action=allow program="%APPDATA%\Venom\autoupdate1.exe" enable=yes
  • '%WINDIR%\syswow64\netsh.exe' advfirewall firewall add rule name="Windows Service" dir=in action=allow program="%APPDATA%\Venom\autoupdate2.exe" enable=yes
  • '%WINDIR%\syswow64\netsh.exe' advfirewall firewall add rule name="Windows Task" dir=in action=allow program="%APPDATA%\Venom\update.exe" enable=yes
  • '%WINDIR%\syswow64\netsh.exe' advfirewall firewall add rule name="Windows" dir=in action=allow program="%APPDATA%\Venom\venom_nkrok.exe" enable=yes
  • '%WINDIR%\syswow64\netsh.exe' advfirewall firewall add rule name="Windows System" dir=in action=allow program="%APPDATA%\venom\nkrok.exe" enable=yes
Modifies file system
Creates the following files
  • %APPDATA%\venom.exe
Sets the 'hidden' attribute to the following files
  • %APPDATA%\venom.exe
Network activity
TCP
HTTP GET requests
  • http://ip##pi.com/json/
  • 'pa###bin.com':443
  • 'mi##ic.net':443
    • UDP
    • DNS ASK pa###bin.com
    • DNS ASK ip##pi.com
    • DNS ASK mi##ic.net
    Miscellaneous
    Creates and executes the following
    • '%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' Add-MpPreference -ExclusionPath "%APPDATA%\Microsoft\Windows\Start Menu\Programs\Startup\<File name>.exe" -Force' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "Windows Update" -Direction Inbound -Program "%APPDATA%\Venom\rdpinstall.exe" -Action Allow & exit' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "Chrome" -Direction Outbound -Program "%APPDATA%\Venom\winvnc.exe" -Action Allow & exit' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "Chrome" -Direction Inbound -Program "%APPDATA%\Venom\winvnc.exe" -Action Allow & exit' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "Google" -Direction Outbound -Program "%APPDATA%\Venom\ngrok.exe" -Action Allow & exit' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "Google" -Direction Inbound -Program "%APPDATA%\Venom\ngrok.exe" -Action Allow & exit' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "rdp" -Direction Outbound -Program "%APPDATA%\Venom\rdpinstall.exe" -Action Allow & exit' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "rdp" -Direction Inbound -Program "%APPDATA%\Venom\rdpinstall.exe" -Action Allow & exit' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "vnc" -Direction Outbound -Program "%APPDATA%\Venom\Venom-winvnc.exe" -Action Allow & exit' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "vnc" -Direction Inbound -Program "%APPDATA%\Venom\Venom-winvnc.exe" -Action Allow & exit' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "ngrok" -Direction Outbound -Program "%APPDATA%\Venom\Venom-ngrok.exe" -Action Allow & exit' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "Windows Update" -Direction Outbound -Program "%APPDATA%\Venom\rdpinstall.exe" -Action Allow & exit' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "ngrok" -Direction Inbound -Program "%APPDATA%\Venom\Venom-ngrok.exe" -Action Allow & exit' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /k netsh advfirewall firewall add rule name="Windows" dir=in action=allow program="%APPDATA%\Venom\venom_nkrok.exe" enable=yes & exit' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /k netsh advfirewall firewall add rule name="Windows Task" dir=in action=allow program="%APPDATA%\Venom\update.exe" enable=yes & exit' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /k netsh advfirewall firewall add rule name="Windows Service" dir=in action=allow program="%APPDATA%\Venom\autoupdate2.exe" enable=yes & exit' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /k netsh advfirewall firewall add rule name="Windows Folder" dir=in action=allow program="%APPDATA%\Venom\autoupdate1.exe" enable=yes & exit' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /k netsh advfirewall firewall add rule name="Venom-winvnc" dir=in action=allow program="%APPDATA%\Venom\winvnc.exe" enable=yes & exit' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /k netsh advfirewall firewall add rule name="Venom-winvnc" dir=in action=allow program="%APPDATA%\Venom\ngrok.exe" enable=yes & exit' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /k netsh advfirewall firewall add rule name="Venom-winvnc" dir=in action=allow program="%APPDATA%\Venom\rdpinstall.exe" enable=yes & exit' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /k netsh advfirewall firewall add rule name="Venom-winvnc" dir=in action=allow program="%APPDATA%\Venom\Venom-winvnc.exe" enable=yes & exit' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /k netsh advfirewall firewall add rule name="Venom-ngrok" dir=in action=allow program="%APPDATA%\Venom\Venom-ngrok.exe" enable=yes & exit' (with hidden window)
    • '%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' Add-MpPreference -ExclusionPath "<Full path to file>" -Force' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /k netsh advfirewall firewall add rule name="Windows System" dir=in action=allow program="%APPDATA%\venom\nkrok.exe" enable=yes & exit' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "Windows task" -Direction Inbound -Program "%APPDATA%\Venom\autoupdate1.exe" -Action Allow & exit' (with hidden window)
    Executes the following
    • '%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' Add-MpPreference -ExclusionPath "%APPDATA%\Microsoft\Windows\Start Menu\Programs\Startup\<File name>.exe" -Force
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "rdp" -Direction Outbound -Program "%APPDATA%\Venom\rdpinstall.exe" -Action Allow & exit
    • '%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' New-NetFirewallRule -DisplayName "rdp" -Direction Outbound -Program "%APPDATA%\Venom\rdpinstall.exe" -Action Allow
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "Google" -Direction Inbound -Program "%APPDATA%\Venom\ngrok.exe" -Action Allow & exit
    • '%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' New-NetFirewallRule -DisplayName "Google" -Direction Inbound -Program "%APPDATA%\Venom\ngrok.exe" -Action Allow
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "Google" -Direction Outbound -Program "%APPDATA%\Venom\ngrok.exe" -Action Allow & exit
    • '%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' New-NetFirewallRule -DisplayName "Google" -Direction Outbound -Program "%APPDATA%\Venom\ngrok.exe" -Action Allow
    • '%WINDIR%\syswow64\cmd.exe' /k netsh advfirewall firewall add rule name="Windows Task" dir=in action=allow program="%APPDATA%\Venom\update.exe" enable=yes & exit
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "Chrome" -Direction Inbound -Program "%APPDATA%\Venom\winvnc.exe" -Action Allow & exit
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "Chrome" -Direction Outbound -Program "%APPDATA%\Venom\winvnc.exe" -Action Allow & exit
    • '%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' New-NetFirewallRule -DisplayName "Chrome" -Direction Outbound -Program "%APPDATA%\Venom\winvnc.exe" -Action Allow
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "Windows Update" -Direction Inbound -Program "%APPDATA%\Venom\rdpinstall.exe" -Action Allow & exit
    • '%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' New-NetFirewallRule -DisplayName "Windows Update" -Direction Inbound -Program "%APPDATA%\Venom\rdpinstall.exe" -Action Allow
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "Windows Update" -Direction Outbound -Program "%APPDATA%\Venom\rdpinstall.exe" -Action Allow & exit
    • '%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' New-NetFirewallRule -DisplayName "Windows Update" -Direction Outbound -Program "%APPDATA%\Venom\rdpinstall.exe" -Action Allow
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "rdp" -Direction Inbound -Program "%APPDATA%\Venom\rdpinstall.exe" -Action Allow & exit
    • '%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' New-NetFirewallRule -DisplayName "rdp" -Direction Inbound -Program "%APPDATA%\Venom\rdpinstall.exe" -Action Allow
    • '%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' New-NetFirewallRule -DisplayName "vnc" -Direction Outbound -Program "%APPDATA%\Venom\Venom-winvnc.exe" -Action Allow
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "vnc" -Direction Outbound -Program "%APPDATA%\Venom\Venom-winvnc.exe" -Action Allow & exit
    • '%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' New-NetFirewallRule -DisplayName "vnc" -Direction Inbound -Program "%APPDATA%\Venom\Venom-winvnc.exe" -Action Allow
    • '%WINDIR%\syswow64\cmd.exe' /k netsh advfirewall firewall add rule name="Venom-ngrok" dir=in action=allow program="%APPDATA%\Venom\Venom-ngrok.exe" enable=yes & exit
    • '%WINDIR%\syswow64\cmd.exe' /k netsh advfirewall firewall add rule name="Venom-winvnc" dir=in action=allow program="%APPDATA%\Venom\Venom-winvnc.exe" enable=yes & exit
    • '%WINDIR%\syswow64\cmd.exe' /k netsh advfirewall firewall add rule name="Venom-winvnc" dir=in action=allow program="%APPDATA%\Venom\rdpinstall.exe" enable=yes & exit
    • '%WINDIR%\syswow64\cmd.exe' /k netsh advfirewall firewall add rule name="Venom-winvnc" dir=in action=allow program="%APPDATA%\Venom\ngrok.exe" enable=yes & exit
    • '%WINDIR%\syswow64\cmd.exe' /k netsh advfirewall firewall add rule name="Venom-winvnc" dir=in action=allow program="%APPDATA%\Venom\winvnc.exe" enable=yes & exit
    • '%WINDIR%\syswow64\cmd.exe' /k netsh advfirewall firewall add rule name="Windows Folder" dir=in action=allow program="%APPDATA%\Venom\autoupdate1.exe" enable=yes & exit
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "Windows task" -Direction Inbound -Program "%APPDATA%\Venom\autoupdate1.exe" -Action Allow & exit
    • '%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' New-NetFirewallRule -DisplayName "Chrome" -Direction Inbound -Program "%APPDATA%\Venom\winvnc.exe" -Action Allow
    • '%WINDIR%\syswow64\cmd.exe' /k netsh advfirewall firewall add rule name="Windows Service" dir=in action=allow program="%APPDATA%\Venom\autoupdate2.exe" enable=yes & exit
    • '%WINDIR%\syswow64\cmd.exe' /k netsh advfirewall firewall add rule name="Windows System" dir=in action=allow program="%APPDATA%\venom\nkrok.exe" enable=yes & exit
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "ngrok" -Direction Inbound -Program "%APPDATA%\Venom\Venom-ngrok.exe" -Action Allow & exit
    • '%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' New-NetFirewallRule -DisplayName "ngrok" -Direction Inbound -Program "%APPDATA%\Venom\Venom-ngrok.exe" -Action Allow
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "ngrok" -Direction Outbound -Program "%APPDATA%\Venom\Venom-ngrok.exe" -Action Allow & exit
    • '%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' New-NetFirewallRule -DisplayName "ngrok" -Direction Outbound -Program "%APPDATA%\Venom\Venom-ngrok.exe" -Action Allow
    • '%WINDIR%\syswow64\cmd.exe' /k powershell New-NetFirewallRule -DisplayName "vnc" -Direction Inbound -Program "%APPDATA%\Venom\Venom-winvnc.exe" -Action Allow & exit
    • '%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' Add-MpPreference -ExclusionPath "<Full path to file>" -Force
    • '%WINDIR%\syswow64\cmd.exe' /k netsh advfirewall firewall add rule name="Windows" dir=in action=allow program="%APPDATA%\Venom\venom_nkrok.exe" enable=yes & exit
    • '%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' New-NetFirewallRule -DisplayName "Windows task" -Direction Inbound -Program "%APPDATA%\Venom\autoupdate1.exe" -Action Allow

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