Trojan.Regger.A

SUMMARY

Trojan.Regger.A is a Trojan horse program that modifies Windows registry settings to add a predefined list of domains into Restricted Sites Zone for Internet Explorer.

Notes: Virus definitions dated January 29, 2005 or earlier may detect this threat as Trojan.Startpage.

Protection

• Virus Definitions (LiveUpdate™ Weekly) January 31, 2005
• Virus Definitions (Intelligent Updater) January 30, 2005

Threat Assessment

Wild

• Wild Level: Low
• Number of Infections: 0 - 49
• Number of Sites: 0 - 2
• Geographical Distribution: Low
• Threat Containment: Easy
• Removal: Easy

Damage

• Damage Level: Low
• Degrades Performance: Modification to Restricted Site zone settings may degrade Network performance.

Distribution

• Distribution Level: Low

TECHNICAL DETAILS

Trojan.Regger.A is often installed by visiting Web sites hosting the malicious file. In some cases the file name has been reported to be zona02.exe.

When the trojan is executed, it performs the following actions:

1. Creates the following subkeys:
   
   171203.com
   2awm.com
   39-93.com
   adult-personals.us
   adult-pic.net
   alfa-search.com
   blendasex.com
   cadabra.biz
   cashsearch.biz
   cl55.biz
   cleanporno.com
   dailyteenspic.com
   dialer2004.com
   digital-pornography.com
   dirty-old-woman.com
   eager-sex.com
   ergosites.com
   erotic-tale.net
   explicitpix.com
   free-gall.com
   free-porno-list.com
   freecj.com
   fuckedgrannies.net
   full-tgp.net
   go-go-go.net
   greg-search.com
   incest-host.com
   ironcarteam.com
   is-best.com
   jeans-mlm.com
   killerpornstars.com
   lab-wire.com
   lollitop.com
   love-host.com
   maybeyes.biz
   mommykiss.com
   my-finder.com
   myexexex.com
   onlineclick.net
   onlysex.ws
   pizdato.biz
   regfreeze.com
   ruworld.com
   selltraffic.biz
   sexunique.net
   sinpussy.com
   sltop.com
   teenhost.net
   teenspix.net
   therealsearch.com
   tinynude.com
   ultraload.net
   v61.com
   vse-moe.biz
   xsex.ws
   xxx-album.com
   zloeboogle.biz
   
   in the registry key:
   
   HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersion
   InternetSettingsoneMapDomains
   
   
2. Adds the value:
   
   "*" = "0x00000004"
   
   to the registry keys created above so that the following domains are added into the Restricted Sites zone for Internet Explorer:
   
   
   • 171203.com
   • 2awm.com
   • 39-93.com
   • adult-personals.us
   • adult-pic.net
   • alfa-search.com
   • blendasex.com
   • cadabra.biz
   • cashsearch.biz
   • cl55.biz
   • cleanporno.com
   • dailyteenspic.com
   • dialer2004.com
   • digital-pornography.com
   • dirty-old-woman.com
   • eager-sex.com
   • ergosites.com
   • erotic-tale.net
   • explicitpix.com
   • freecj.com
   • free-gall.com
   • free-porno-list.com
   • fuckedgrannies.net
   • full-tgp.net
   • go-go-go.net
   • greg-search.com
   • incest-host.com
   • ironcarteam.com
   • is-best.com
   • jeans-mlm.com
   • killerpornstars.com
   • lab-wire.com
   • lollitop.com
   • love-host.com
   • maybeyes.biz
   • mommykiss.com
   • myexexex.com
   • my-finder.com
   • onlineclick.net
   • onlysex.ws
   • pizdato.biz
   • regfreeze.com
   • ruworld.com
   • selltraffic.biz
   • sexunique.net
   • sinpussy.com
   • sltop.com
   • teenhost.net
   • teenspix.net
   • therealsearch.com
   • tinynude.com
   • ultraload.net
   • v61.com
   • vse-moe.biz
   • xsex.ws
   • xxx-album.com
   • zloeboogle.biz
     
     
3. Adds the values:
   
   "*" = "0x00000004"
   ":Range" = "[IP ADDRESS]"
   
   to the registry keys:
   
   HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersion
   InternetSettingsoneMapRangesRange1
   HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersion
   InternetSettingsoneMapRangesRange2
   HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersion
   InternetSettingsoneMapRangesRange3
   HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersion
   InternetSettingsoneMapRangesRange4
   HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersion
   InternetSettingsoneMapRangesRange5
   HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersion
   InternetSettingsoneMapRangesRange6
   HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersion
   InternetSettingsoneMapRangesRange7
   HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersion
   InternetSettingsoneMapRangesRange8
   HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersion
   InternetSettingsoneMapRangesRange9
   HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersion
   InternetSettingsoneMapRangesRange10
   HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersion
   InternetSettingsoneMapRangesRange11
   HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersion
   InternetSettingsoneMapRangesRange12
   HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersion
   InternetSettingsoneMapRangesRange13
   HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersion
   InternetSettingsoneMapRangesRange14
   HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersion
   InternetSettingsoneMapRangesRange15
   HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersion
   InternetSettingsoneMapRangesRange16
   HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersion
   InternetSettingsoneMapRangesRange17
   
   so that the following IP address are added into the Restricted Sites zone for Internet Explorer:
   
   
   • 195.225.177.13
   • 206.161.207.105
   • 209.8.161.52
   • 213.159.117.131
   • 213.159.117.235
   • 38.113.193.2
   • 65.110.38.219
   • 65.125.230.94
   • 66.230.145.49
   • 66.79.169.45
   • 66.98.198.202
   • 69.31.79.102
   • 69.50.170.212
   • 81.211.105.37
   • 81.222.131.56
   • 82.196.67.62
   • 82.196.73.10

Recommendations

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.

REMOVAL

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

1. Disable System Restore (Windows Me/XP).
2. Update the virus definitions.
3. Run a full system scan and delete all the files detected.
4. Removing the Web sites added to the Internet Explorer Restricted sites menu.
   

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

1. To disable System Restore (Windows Me/XP)
If you are running Windows Me or Windows XP, we recommend that you temporarily turn off System Restore. Windows Me/XP uses this feature, which is enabled by default, to restore the files on your computer in case they become damaged. If a virus, worm, or Trojan infects a computer, System Restore may back up the virus, worm, or Trojan on the computer.

Windows prevents outside programs, including antivirus programs, from modifying System Restore. Therefore, antivirus programs or tools cannot remove threats in the System Restore folder. As a result, System Restore has the potential of restoring an infected file on your computer, even after you have cleaned the infected files from all the other locations.

Also, a virus scan may detect a threat in the System Restore folder even though you have removed the threat.

For instructions on how to turn off System Restore, read your Windows documentation, or one of the following articles:

• How to disable or enable Windows Me System Restore
• How to turn off or turn on Windows XP System Restore

Note: When you are completely finished with the removal procedure and are satisfied that the threat has been removed, reenable System Restore by following the instructions in the aforementioned documents.

For additional information, and an alternative to disabling Windows Me System Restore, see the Microsoft Knowledge Base article: Antivirus Tools Cannot Clean Infected Files in the _Restore Folder (Article ID: Q263455).


2. To update the virus definitions
Symantec Security Response fully tests all the virus definitions for quality assurance before they are posted to our servers. There are two ways to obtain the most recent virus definitions:

• Running LiveUpdate, which is the easiest way to obtain virus definitions: These virus definitions are posted to the LiveUpdate servers once each week (usually on Wednesdays), unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, refer to Virus Definitions (LiveUpdate).
• Downloading the definitions using the Intelligent Updater: The Intelligent Updater virus definitions are posted daily. You should download the definitions from the Symantec Security Response Web site and manually install them. To determine whether definitions for this threat are available by the Intelligent Updater, refer to Virus Definitions (Intelligent Updater).
  
  The latest Intelligent Updater virus definitions can be obtained here: Intelligent Updater virus definitions. For detailed instructions read the document: How to update virus definition files using the Intelligent Updater.

3. To scan for and delete the infected files

1. Start your Symantec antivirus program and make sure that it is configured to scan all the files.
   • For Norton AntiVirus consumer products: Read the document: How to configure Norton AntiVirus to scan all files.
   • For Symantec AntiVirus Enterprise products: Read the document: How to verify that a Symantec Corporate antivirus product is set to scan all files.
2. Run a full system scan.
3. If any files are detected, click Delete.

Important: If you are unable to start your Symantec antivirus product or the product reports that it cannot delete a detected file, you may need to stop the risk from running in order to remove it. To do this, run the scan in Safe mode. For instructions, read the document, How to start the computer in Safe Mode. Once you have restarted in Safe mode, run the scan again.

After the files are deleted, restart the computer in Normal mode and proceed with the next section.

Warning messages may be displayed when the computer is restarted, since the threat may not be fully removed at this point. You can ignore these messages and click OK. These messages will not appear when the computer is restarted after the removal instructions have been fully completed. The messages displayed may be similar to the following:

Title: [FILE PATH]
Message body: Windows cannot find [FILE NAME]. Make sure you typed the name correctly, and then try again. To search for a file, click the Start button, and then click Search.


4. To delete the Web sites added to the Internet Explorer Restricted sites menu

1. Start Microsoft Internet Explorer.
2. Click Tools > Internet Options.
3. In the Restricted sites section of the Security tab, click Site.
4. Delete the domains and IP address added by the threat.