W32.Vispat.C@mm

When the worm is executed, it creates the following files:

• %UserProfile%\Application Data\Microsoft\Address Book\[USER NAME].wab
• %UserProfile%\Local Settings\Application Data\Identities\{RANDOM CLSID}\Microsoft\Outlook Express\Folders.dbx
• %UserProfile%\Local Settings\Application Data\Identities\{RANDOM CLSID}\Microsoft\Outlook Express\Inbox.dbx
• %UserProfile%\Local Settings\Application Data\Identities\{RANDOM CLSID}\Microsoft\Outlook Express\Offline.dbx
• %System%\officeparam.dll
• %System%\scansvc\trust\documenti_personali.exe
• %System%\windowslite.pbk
• %SystemDrive%\documenti.zip

It then creates the following registry entry, so that it starts when Windows starts: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\"documenti_personali.exe" = "%System%\scansvc\trust\documenti_personali.exe"

The worm then modifies the following registry entry, which changes the home page for Internet Explorer:
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\"Start Page" = "[http://]www.katasearch.com"

Next, it creates registry subkeys under the following subkey:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\Domains

Note: These subkeys add the following Web sites to Internet Explorer's Trusted Zones:

• [http://]foto-personali.name
• [http://]katasearch.com
• [http://]tuttoavolonta.com

The worm also modifies the following registry entries, which lowers the default security settings for Trusted Zones in Internet Explorer:

• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\2\"MinLevel" = "0"
• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\2\"RecommendedLevel" = "0"
• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\2\"1001" = "0"
• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\2\"1004" = "0"
• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\2\"1200" = "0"
• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\2\"1201" = "0"
• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\2\"1400" = "0"
• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\2\"1402" = "0"
• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\2\"1405" = "0"
• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\2\"1406" = "0"
• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\2\"1407" = "0"
• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\2\"1609" = "0"
• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\2\"1800" = "0"
• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\2\"1803" = "0"

The worm may then modify the following registry entries, attempting to hide its presence on the computer by modifying the default folder viewing options:

• HKEY_CURRENT_USER\software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\"Hidden" = "0"
• HKEY_CURRENT_USER\software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\"ShowSuperHidden" = "0"
• HKEY_CURRENT_USER\software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\"SuperHidden" = "0"

The worm creates the following registry subkey, which creates a folder named Immagini under My Computer: HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{16C7013F-912E-42ac-AA8E-A10A180DFF51}

Note: When the above folder is opened, Internet Explorer will be executed and will load the following URL:
[http://]foto-personali.name

The worm may create some or all of the following shortcut links:

• %UserProfile%\Desktop\Foto Personali.lnk
• %UserProfile%\Desktop\Microsoft IE Link.lnk
• %UserProfile%\Start Menu\Foto Personali.lnk

Note: These links point to one of the Web sites that the worm has added to Internet Explorer's Trusted Zone.

The worm then creates the following registry entries, which creates a new email account in Outlook Express:

• HKEY_CURRENT_USER\Identities\{RANDOM CLSID}\Software\Microsoft\Outlook Express\5.0\"SpellDontIgnoreDBCS" = "1"
• HKEY_CURRENT_USER\Identities\{RANDOM CLSID}\Software\Microsoft\Outlook Express\5.0\"MSIMN" = "1"
• HKEY_CURRENT_USER\Identities\{RANDOM CLSID}\Software\Microsoft\Outlook Express\5.0\"StoreMigratedV5" = "1"
• HKEY_CURRENT_USER\Identities\{RANDOM CLSID}\Software\Microsoft\Outlook Express\5.0\"ConvertedToDBX" = "1"
• HKEY_CURRENT_USER\Identities\{RANDOM CLSID}\Software\Microsoft\Outlook Express\5.0\"Settings Upgraded" = "7"
• HKEY_CURRENT_USER\Identities\{RANDOM CLSID}\Software\Microsoft\Outlook Express\5.0\"Running" = "1"
• HKEY_CURRENT_USER\Identities\{RANDOM CLSID}\Software\Microsoft\Outlook Express\5.0\"Store Root" = "%UserProfile%\Local Settings\Application Data\Identities\{RANDOM CLSID}\Microsoft\Outlook Express\"
• HKEY_CURRENT_USER\Identities\{RANDOM CLSID}\Software\Microsoft\Outlook Express\5.0\Mail\"Welcome Message" = "0"
• HKEY_CURRENT_USER\Identities\{RANDOM CLSID}\Software\Microsoft\Outlook Express\5.0\Mail\"Accounts Checked" = "00 00 00 00"
• HKEY_CURRENT_USER\Identities\{RANDOM CLSID}\Software\Microsoft\Outlook Express\5.0\Mail\"Safe Attachments" = "1"
• HKEY_CURRENT_USER\Identities\{RANDOM CLSID}\Software\Microsoft\Outlook Express\5.0\Mail\"Secure Safe Attachments" = "1"
• HKEY_CURRENT_USER\Identities\{RANDOM CLSID}\Software\Microsoft\Outlook Express\5.0\News\"Accounts Checked" = "00 00 00 00"HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\"ConnectionSettingsMigrated" = "1"
• HKEY_CURRENT_USER\Software\Microsoft\WAB\WAB4\Wab File Name\"(Default)" = "%UserProfile%\Application Data\Microsoft\Address Book\[USER NAME].wab"
• HKEY_CURRENT_USER\Software\Microsoft\WAB\WAB4\"OlkContactRefresh" = "0"
• HKEY_CURRENT_USER\Software\Microsoft\WAB\WAB4\"OlkFolderRefresh" = "0"

The worm then scans the Windows Address Book and emails iteself to each contact. The message has the following characteristics:
Subject:
Guarda che stai rompendo !

Message body:
Non capisco perch
continui a mandarmi certe cose

controlla il contenuto della fattura in allegato e se non ti dovessere essere troppo chiaro ti consiglio vivamente di scaricare l'intera documentazione che ti riguarda sul sito di amministrazione.

spero che non si ripetano errori come questo

saluti

Note: The message contains a link to [http://]www.sicure-mail.com/download/lista_doc[REMOVED]

Attachment:
documenti.zip

Recommendations

Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

• Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
• Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
• Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
• Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
• Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
• Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
• If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
• Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
• Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
• Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
• Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
• If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
• For further information on the terms used in this document, please refer to the Security Response glossary.

Summary