Win32.HLLW.Autoruner.51956
Added to the Dr.Web virus database:
2011-06-17
Virus description added:
2011-06-17
Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\msconfig.exe] 'Debugger' = '<DRIVERS>\Yotninam.exe'
- [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\notepad.exe] 'Debugger' = '<DRIVERS>\Yotninam.exe'
- [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'explorer.exe,Yotninam.exe'
- [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\regedit.exe] 'Debugger' = '<DRIVERS>\Yotninam.exe'
- [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'USBGuard' = '<SYSTEM32>\Y0tninam.exe'
- [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'explorer.exe,<Virus name>.exe'
- [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\taskmgr.exe] 'Debugger' = '<DRIVERS>\Yotninam.exe'
Creates the following files on removable media:
- <Drive name for removable media>:\autorun.inf
- <Drive name for removable media>:\Yotninam.exe
Malicious functions:
To complicate detection of its presence in the operating system,
forces the system hide from view:
- hidden files
- file extensions
Creates and executes the following:
Executes the following:
Modifies settings of Windows Explorer:
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] 'NoFolderOptions' = '00000001'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] 'NoFind' = '00000001'
Forces autoplay for removable media.
Modifies file system :
Creates the following files:
- <DRIVERS>\yotninam.exe
- <SYSTEM32>\Y0tninam.exe
- %WINDIR%\msconfig.exe
- %WINDIR%\Yotninam.exe
- %WINDIR%\autorun.inf
Sets the 'hidden' attribute to the following files:
- <SYSTEM32>\Y0tninam.exe
- %WINDIR%\Yotninam.exe
- <Drive name for removable media>:\Yotninam.exe
- %WINDIR%\autorun.inf
- <Drive name for removable media>:\autorun.inf
Deletes the following files:
- <Drive name for removable media>:\autorun.inf
Miscellaneous:
Searches for the following windows:
- ClassName: '' WindowName: ''
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