Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'SYS2' = '%WINDIR%\csrss.exe'
- [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'SYS1' = '%WINDIR%\smss.exe'
- [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices] 'SYS0' = '%WINDIR%\lsass.exe'
Creates or modifies the following files:
- %HOMEPATH%\Start Menu\Programs\Startup\services.exe
Creates the following files on removable media:
- <Drive name for removable media>:\autorun.inf\pkl.exe
Malicious functions:
To complicate detection of its presence in the operating system,
forces the system hide from view:
- hidden files
- file extensions
blocks execution of the following system utilities:
- Registry Editor (RegEdit)
Creates and executes the following:
- %WINDIR%\csrss.exe
- %HOMEPATH%\Start Menu\Programs\Startup\services.exe
- %WINDIR%\lsass.exe
- %WINDIR%\smss.exe
Modifies settings of Windows Explorer:
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] 'NoFolderOptions' = '00000001'
Modifies file system :
Creates the following files:
- %WINDIR%\csrss.exe
- %WINDIR%\smss.exe
- %WINDIR%\lsass.exe
Sets the 'hidden' attribute to the following files:
- %HOMEPATH%\Start Menu\Programs\Startup\services.exe
- <Drive name for removable media>:\autorun.inf\pkl.exe
- %WINDIR%\csrss.exe
- %WINDIR%\lsass.exe
- %WINDIR%\smss.exe
Deletes the following files:
- <Drive name for removable media>:\autorun.inf\pkl.exe
Miscellaneous:
Searches for the following windows:
- ClassName: 'Shell_TrayWnd' WindowName: ''
