Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'UserFaultCheck' = ''
- [<HKLM>\SOFTWARE\Classes\exefile\shell\open\command] '' = '<SYSTEM32>\IMSIT.EXE Letov %1 %*'
Creates the following services:
- [<HKLM>\SYSTEM\ControlSet001\Services\NetCtrl] 'Start' = '00000002'
Substitutes the following executable system files:
- <SYSTEM32>\dllcache\oemig50.exe with <SYSTEM32>\dllcache\oemig50.exe.new
- <SYSTEM32>\dllcache\shvlzm.exe with <SYSTEM32>\dllcache\shvlzm.exe.new
Malicious functions:
To complicate detection of its presence in the operating system,
blocks execution of the following system utilities:
- Windows Task Manager (Taskmgr)
- Registry Editor (RegEdit)
Creates and executes the following:
- <DRIVERS>\smss.exe
Modifies settings of Windows Explorer:
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] 'NoControlPanel' = '00000001'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] 'NoDesktop' = '00000001'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] 'NoTrayContextMenu' = '00000001'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] 'NoFileMenu' = '00000001'
Modifies file system :
Creates the following files:
- %PROGRAM_FILES%\Outlook Express\oemig50.exe.new
- %PROGRAM_FILES%\MSN Gaming Zone\Windows\shvlzm.exe.new
- <SYSTEM32>\dllcache\oemig50.exe.new
- <SYSTEM32>\dllcache\shvlzm.exe.new
- <SYSTEM32>\IMSIT.EXE
- <DRIVERS>\smss.exe
- %WINDIR%\pchealth\ERRORREP\UserDumps\smss.exe.20111114-203731-00.hdmp
- %WINDIR%\pchealth\ERRORREP\UserDumps\smss.exe.20111114-203731-00.mdmp
Sets the 'hidden' attribute to the following files:
- <SYSTEM32>\IMSIT.EXE
- <DRIVERS>\smss.exe
