Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [<HKLM>\SOFTWARE\Classes\WinRAR.REV\shell\open\command] '' = '%WINDIR%\system\kavs32.exe %1'
- [<HKLM>\SOFTWARE\Classes\WinRAR.ZIP\shell\open\command] '' = '%WINDIR%\system\kavs32.exe %1'
- [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'userinit' = '<SYSTEM32>\userinit.exe,ravs32.exe'
- [<HKLM>\SOFTWARE\Classes\WinRAR\shell\open\command] '' = '%WINDIR%\system\kavs32.exe %1'
Creates the following files on removable media:
- <Drive name for removable media>:\autorun.inf
- <Drive name for removable media>:\Recycled\ravs32.exe
Malicious functions:
To complicate detection of its presence in the operating system,
forces the system hide from view:
- hidden files
Executes the following:
- '%WINDIR%\explorer.exe' C:
Modifies file system :
Creates the following files:
- %WINDIR%\system\kavs32.exe
- <SYSTEM32>\ravs32.exe
Sets the 'hidden' attribute to the following files:
- <SYSTEM32>\ravs32.exe
- %WINDIR%\system\kavs32.exe
- <Drive name for removable media>:\Recycled\ravs32.exe
- <Drive name for removable media>:\autorun.inf
Miscellaneous:
Searches for the following windows:
- ClassName: 'Shell_TrayWnd' WindowName: '(null)'
- ClassName: '' WindowName: '(null)'
