Printer Friendly Page

Discovered: September 14, 2004
Updated: February 13, 2007 12:27:37 PM
Type: Trojan Horse
Systems Affected: Windows

Bloodhound.Exploit.13 is a heuristic detection for malformed JPEG files that are potentially related to the GDI+ integer overflow, described in Microsoft Security Bulletin MS04-028 .

The files detected as Bloodhound.Exploit.13 may be malicious, or they may be the result of corruption. We suggest that you submit to Symantec Security Response any files that are detected as Bloodhound.Exploit.13. For instructions on how to do this using Scan and Deliver, read the document How to submit a file to Symantec Security Response using Scan and Deliver .

Antivirus Protection Dates

  • Initial Rapid Release version September 15, 2004
  • Latest Rapid Release version April 25, 2019 revision 024
  • Initial Daily Certified version October 31, 2007 revision 003
  • Latest Daily Certified version April 26, 2019 revision 006
  • Initial Weekly Certified release date September 15, 2004

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Technical Description

Microsoft Security Bulletin MS04-028 describes a vulnerability in the JPEG parser of the GDI+ library, which various Microsoft operating systems and software packages use. (Read the Security Bulletin for a list of affected software).

The vulnerability is related to the way the GDI+ library interprets the length field in the header of certain JPEG image segments. The Bloodhound.Exploit.13 detection attempts to identify the files that could have been crafted to exploit the MS04-028 vulnerability, by checking for invalid segment length fields in JPEG images.


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.