Win32.HLLW.Autoruner1.29268
Added to the Dr.Web virus database:
2012-11-05
Virus description added:
2012-11-05
Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'kavav.exe' = '%WINDIR%\winlog\screensaver.exe'
- [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'kavavp.exe' = '%WINDIR%\winlog\screensaver.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
- file extensions
blocks execution of the following system utilities:
- Windows Task Manager (Taskmgr)
Creates and executes the following:
Executes the following:
- <SYSTEM32>\attrib.exe +S +H +R "L:\autorun.inf"
- <SYSTEM32>\attrib.exe +S +H +R "M:\autorun.inf"
- <SYSTEM32>\attrib.exe +S +H +R "C:\autorun.inf"
- <SYSTEM32>\attrib.exe +S +H +R "K:\autorun.inf"
- <SYSTEM32>\attrib.exe +S +H +R "J:\Karla.EXE"
- <SYSTEM32>\attrib.exe +S +H +R "I:\Karla.EXE"
- <SYSTEM32>\attrib.exe +S +H +R "O:\autorun.inf"
- <SYSTEM32>\attrib.exe +S +H +R "P:\autorun.inf"
- <SYSTEM32>\attrib.exe +S +H +R "I:\autorun.inf"
- <SYSTEM32>\attrib.exe +S +H +R "H:\autorun.inf"
- <SYSTEM32>\ping.exe 127.0.0.1 -n 5
- <SYSTEM32>\attrib.exe +S +H +R "J:\autorun.inf"
- <SYSTEM32>\attrib.exe +S +H +R "E:\autorun.inf"
- <SYSTEM32>\attrib.exe +S +H +R "<Drive name for removable media>:\autorun.inf"
- <SYSTEM32>\attrib.exe +S +H +R "G:\autorun.inf"
- <SYSTEM32>\attrib.exe +S +H +R "F:\autorun.inf"
- <SYSTEM32>\attrib.exe +S +H +R "H:\Karla.EXE"
- <SYSTEM32>\reg.exe ADD HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d "1" /f
- <SYSTEM32>\reg.exe ADD HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced /v HideFileExt /t REG_DWORD /d "1" /f
- <SYSTEM32>\attrib.exe +S +H +R "O:\Karla.EXE"
- <SYSTEM32>\attrib.exe +S +H +R "P:\Karla.EXE"
- <SYSTEM32>\reg.exe ADD HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run /v kavavp.exe /t REG_SZ /d "%WINDIR%\winlog\screensaver.exe" /f
- <SYSTEM32>\attrib.exe +r +a +s +h %WINDIR%\winlog
- <SYSTEM32>\reg.exe ADD HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced /v Hidden /t REG_DWORD /d "2" /f
- <SYSTEM32>\reg.exe ADD HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run /v kavav.exe /t REG_SZ /d "%WINDIR%\winlog\screensaver.exe" /f
- <SYSTEM32>\attrib.exe +S +H +R "E:\Karla.EXE"
- <SYSTEM32>\attrib.exe +S +H +R "<Drive name for removable media>:\Karla.EXE"
- <SYSTEM32>\attrib.exe +S +H +R "G:\Karla.EXE"
- <SYSTEM32>\attrib.exe +S +H +R "F:\Karla.EXE"
- <SYSTEM32>\attrib.exe +S +H +R "L:\Karla.EXE"
- <SYSTEM32>\attrib.exe +S +H +R "M:\Karla.EXE"
- <SYSTEM32>\attrib.exe +S +H +R "C:\Karla.EXE"
- <SYSTEM32>\attrib.exe +S +H +R "K:\Karla.EXE"
Modifies file system :
Creates the following files:
- %WINDIR%\winlog\WINUPDATE.DLL
- C:\autorun.inf
- <LS_APPDATA>\Karla.exe
- %TEMP%\a02860.bat
Sets the 'hidden' attribute to the following files:
- <Drive name for removable media>:\autorun.inf
- C:\autorun.inf
- %TEMP%\a02860.bat
Miscellaneous:
Searches for the following windows:
- ClassName: 'Indicator' WindowName: ''
- ClassName: 'Shell_TrayWnd' WindowName: ''
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