Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'e778227779b39aef6a5749ef50ad139a' = '"%TEMP%\grvbgvt.exe" ..'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'e778227779b39aef6a5749ef50ad139a' = '"%TEMP%\grvbgvt.exe" ..'
Malicious functions:
To bypass firewall, removes or modifies the following registry keys:
- [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%TEMP%\grvbgvt.exe' = '%TEMP%\grvbgvt.exe:*:Enabled:grvbgvt.exe'
Creates and executes the following:
- '%TEMP%\grvbgvt.exe'
- '%APPDATA%\xhw0grx6dsVIdTLpGoKV.exe'
Executes the following:
- '<SYSTEM32>\netsh.exe' firewall add allowedprogram "%TEMP%\grvbgvt.exe" "grvbgvt.exe" ENABLE
Modifies file system :
Creates the following files:
- %WINDIR%\Microsoft.NET\Framework\v2.0.50727\CONFIG\enterprisesec.config.cch.new
- %TEMP%\grvbgvt.exe
- %APPDATA%\xhw0grx6dsVIdTLpGoKV.exe
- %WINDIR%\Microsoft.NET\Framework\v2.0.50727\CONFIG\security.config.cch.new
Moves the following files:
- from %WINDIR%\Microsoft.NET\Framework\v2.0.50727\CONFIG\enterprisesec.config.cch.new to %WINDIR%\Microsoft.NET\Framework\v2.0.50727\CONFIG\enterprisesec.config.cch
- from %WINDIR%\Microsoft.NET\Framework\v2.0.50727\CONFIG\security.config.cch.new to %WINDIR%\Microsoft.NET\Framework\v2.0.50727\CONFIG\security.config.cch
Network activity:
Connects to:
- '<Private IP address>':1177
Miscellaneous:
Searches for the following windows:
- ClassName: 'Indicator' WindowName: ''
