Virus Definitions (LiveUpdate™ Plus) April 12, 2006 Virus Definitions (LiveUpdate™ Daily) April 12, 2006 Virus Definitions (LiveUpdate™ Weekly) April 12, 2006 Virus Definitions (Intelligent Updater) April 12, 2006

Wild Number of infections: 0 - 49 Number of sites: 0 - 2 Geographical distribution: Low Threat containment: Easy Removal: Easy

Threat Metrics Wild: Low Damage: Low Distribution: Low

Damage

• Payload Trigger: n/a
• Payload: n/a
  • Large scale e-mailing: n/a
  • Deletes files: n/a
  • Modifies files: n/a
  • Degrades performance: n/a
  • Causes system instability: n/a
  • Releases confidential info: n/a
  • Compromises security settings: n/a

Distribution

• Subject of email: n/a
• Name of attachment: n/a
• Size of attachment: n/a
• Time stamp of attachment: n/a
• Ports: n/a
• Shared drives: n/a
• Target of infection: n/a

Bloodhound.Exploit.65 is a heuristic detection for the Vulnerability in Outlook Express Could Allow Remote Code Execution issue.

An attacker who exploits this vulnerability could execute arbitrary code with the privileges of the logged-on user. The attack can be launched by a user opening a malicious Windows Address Book file. Normally, such a file will have a .WAB extension, but in some cases, Internet Explorer can be instructed to open the file even though it has a different extension.

Applies to: Outlook Express 5.5; Outlook Express 6.0

Files that are detected as Bloodhound.Exploit.65 may be malicious. We suggest that you submit to Symantec Security Response any files that are detected as Bloodhound.Exploit.65. For instructions on how to do this using Scan and Deliver, read How to submit a file to Symantec Security Response using Scan and Deliver.

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

• Turn off and remove unneeded services. By default, many operating systems install auxiliary services that are not critical, such as an FTP server, telnet, and a Web server. These services are avenues of attack. If they are removed, blended threats have less avenues of attack and you have fewer services to maintain through patch updates.
• If a blended 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 (for example, all Windows-based computers should have the current Service Pack installed.). Additionally, please apply any security updates that are mentioned in this writeup, in trusted Security Bulletins, or on vendor Web sites.
• 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.
• Configure your email server to block or remove email that contains file attachments that are commonly used to spread viruses, such as .vbs, .bat, .exe, .pif and .scr files.
• Isolate infected computers quickly to prevent further compromising your organization. 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 you believe you have been infected, please download the latest virus definitions via LiveUpdate or from the Symantec Security Response Web site.

• Click here for instructions on using LiveUpdate to retrieve virus definitions.
• Click here to manually download and install virus definitions from the Symantec Security Response Web site.