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Trojan Horse
Discovered on: ,
Last Updated on: November 15, 2004 05:26:00 PM







Trojan horse is a generic detection for various Trojan horse programs.



Type: Trojan Horse
Infection Length: varies












Wild

Number of infections: More than 1000
Number of sites: More than 10
Geographical distribution: Low
Threat containment: Easy
Removal: Moderate
Threat Metrics


Wild:
Medium
Damage:
Medium
Distribution:
Low



Damage

Payload Trigger: n/a
Payload: varies
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


Symantec antivirus programs use Trojan horse as a generic detection when detecting many individual but varied Trojan horse programs for which specific definitions have not been created.

In these cases, a generic detection is used because it protects against many Trojans that share similar characteristics.

If a malicious program does not infect other files and does not automatically distribute itself, the program is usually labeled a Trojan horse. For additional information, see the following:

What is the difference between viruses, worms, and Trojans?
Virus naming conventions






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.


The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.


Disable System Restore (Windows Me/XP).
Update the virus definitions.
Restart the computer in Safe mode or VGA mode.
Run a full system scan and delete all the files detected as Trojan horse.
Delete any values that were added to the registry.
Windows 95/98/Me only: Remove any references to the infected files, which the Trojan added to the Win.ini and System.ini files.
Clear the Temporary Internet Files folder, if required

For specific details on each of these steps, read the following instructions

Disable System Restore (Windows Me/XP).
Update the virus definitions.
Restart the computer in Safe mode or VGA mode.
Run a full system scan and delete all the files detected as Trojan horse.
Delete any values that were added to the registry.
Windows 95/98/Me only: Remove any references to the infected files, which the Trojan added to the Win.ini and System.ini files.
Clear the Temporary Internet Files folder, if required

La cerise de Norton internet security 2005 n'est valable qu'un peux moins de 3 mois, attention au message,

désinstaller, nettoyer la base de registre, réinstaller et réactiver