Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'explorer.exe, yah000.exe'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'Runonce' = '%WINDIR%\limbo0o.exe'
Creates or modifies the following files:
- %HOMEPATH%\Start Menu\Programs\Startup\yaho00.exe
- %HOMEPATH%\Start Menu\Programs\Startup\IEXPLORE.EXE
Creates the following files on removable media:
- <Drive name for removable media>:\limbo0o.exe
- <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
- file extensions
blocks execution of the following system utilities:
- Windows Task Manager (Taskmgr)
- Registry Editor (RegEdit)
blocks the following features:
- System Restore (SR)
Forces autoplay for removable media.
Sets a new unauthorized home page for Windows Internet Explorer.
Modifies file system :
Creates the following files:
- %WINDIR%\yah0o0.exe
- %WINDIR%\yah000.exe
- C:\limbo0o.exe
- C:\autorun.inf
- %TEMP%\jsdmzqh
- %TEMP%\aut1.tmp
- %WINDIR%\limbo0o.exe
- %WINDIR%\autorun.inf
Sets the 'hidden' attribute to the following files:
- C:\limbo0o.exe
- <Drive name for removable media>:\autorun.inf
- <Drive name for removable media>:\limbo0o.exe
- C:\autorun.inf
- %WINDIR%\yah000.exe
- %WINDIR%\limbo0o.exe
- %WINDIR%\autorun.inf
Deletes the following files:
- C:\autorun.inf
- <Drive name for removable media>:\autorun.inf
- %TEMP%\aut1.tmp
- %TEMP%\jsdmzqh
Miscellaneous:
Searches for the following windows:
- ClassName: 'Indicator' WindowName: ''
- ClassName: 'Shell_TrayWnd' WindowName: ''
