W32/Sohana-AO

Please follow the instructions for removing worms.

The scheduled task will need to be removed from Control Panel -> Scheduled Tasks.

W32/Sohana-AO is a worm for the Windows platform.

W32/Sohana-AO spreads via email and by copying itself to network shares and removeable media.

W32/Sohana-AO copies itself to the root folder of removeable drives with the filenames:

SSCVIHOST.exe
New Folder.exe

and drops an auturun.inf file to the root folder of the removeable drive in an attempt to execute SSCVIHOST.exe when the drive is inserted.

W32/Sohana-AO copies itself to all sub-folders of the removeable drive with filenames consisting of the folder name and an extension of .EXE, but not if a file already exists in the folder with such as filename.

Note: the W32/Sohana-AO executable has a folder icon and copies may have the hidden and system attributes set.

When first run W32/Sohana-AO copies itself to:

<Windows>\SSCVIHOST.exe
<System>\blastclnnn.exe
<System>\SSCVIHOST.exe

and creates the following file:

<System>\autorun.ini

The following registry entry is created to run SSCVIHOST.exe on startup:

HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Yahoo Messengger
<System>\SSCVIHOST.exe

The following registry entry is changed to run SSCVIHOST.exe on startup:

HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
Shell
Explorer.exe SSCVIHOST.exe

W32/Sohana-AO creates a scheduled task to run blastclnnn.exe at 09.00 every day.

The following registry entries are set, disabling system software:

HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System
DisableRegistryTools
1

HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System
DisableTaskMgr
1

The following registry entry is set:

HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
NofolderOptions
1

The following registry entry is created:

HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\WorkgroupCrawler\Shares
shared
\New Folder.exe