Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [<HKLM>\SOFTWARE\Classes\txtfile\shell\open\command] '' = '<SYSTEM32>\DLLCACHE\-KAVStat.exe %1'
- [<HKLM>\SOFTWARE\Classes\txtfile\shell\open\command] '' = 'C:\WINNT\SYSTEM32\DLLCACHE\-KAVStat.exe %1'
- [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'SystemDrive' = 'C:\WINNT\SYSTEM32\dllhot.exe'
- [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] '#DLLHOT' = '<SYSTEM32>\dllhot.exe'
- [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'SystemDrive' = '<SYSTEM32>\dllhot.exe'
Creates the following files on removable media:
- <Drive name for removable media>:\AutoRun.inf
Malicious functions:
To complicate detection of its presence in the operating system,
forces the system hide from view:
- hidden files
blocks execution of the following system utilities:
- Registry Editor (RegEdit)
Creates and executes the following:
- '<SYSTEM32>\dllhot.exe'
Executes the following:
- '%WINDIR%\explorer.exe' C:
- '<SYSTEM32>\cmd.exe' /c %WINDIR%\SYSTEM\systemdrive.bat
Modifies settings of Windows Explorer:
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] 'NoRun' = '00000001'
Sets a new unauthorized home page for Windows Internet Explorer.
Modifies file system :
Creates the following files:
- %WINDIR%\inf\Auto2.inf
- <SYSTEM32>\dllcache\-KAVStat.exe
- <SYSTEM32>\dllhot.exe
- %WINDIR%\system\systemdrive.bat
- %WINDIR%\inf\Auto1.inf
Sets the 'hidden' attribute to the following files:
- <SYSTEM32>\dllcache\-KAVStat.exe
- <Drive name for removable media>:\AutoRun.inf
Deletes the following files:
- %TEMP%\~DF19EE.tmp
Miscellaneous:
Searches for the following windows:
- ClassName: '' WindowName: '(null)'
- ClassName: 'Button' WindowName: '(null)'
- ClassName: 'Shell_TrayWnd' WindowName: '(null)'