Threat Explorer

The Threat Explorer is a comprehensive resource consumers can turn to for daily, accurate, up-to-date information on the latest threats, risks and vulnerabilities.

DonaldD.Trojan.C

DonaldD.Trojan.C

Discovered:
12 September 2001
Updated:
13 February 2007
Also Known As:
Backdoor-AQ

This Trojan allows a hacker to have remote access to the computer. It modifies the registry so that it runs when you start Windows.

Antivirus Protection Dates

  • Initial Rapid Release version 12 September 2001
  • Latest Rapid Release version 20 August 2008 revision 017
  • Initial Daily Certified version 12 September 2001
  • Latest Daily Certified version 20 August 2008 revision 016
  • Initial Weekly Certified release date pending
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

If the Trojan is run, it creates the following files:
  • \Windows\System\Rgl5max.exe
  • \Windows\System\Pon2dil.vxd

These files are loaded as a service when you start Windows. This is accomplished by making the following changes to the registry:

The Trojan creates the key

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\PON2DIL

with the values

StaticVxD  pon2dil.vxd
Start      00

and the key

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\PEN2D

with the value

dxt        <long string of byte sequences>


It also adds the value

@          <long string of random characters>

to the keys

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Keyboard Layouts\0000080A

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Time Zones\W. Europe

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.

To remove this Trojan, delete all files that are detected as DonaldD.Trojan.C and remove the two \VxD subkeys that it added.

To remove the Trojan:
  1. Run LiveUpdate to make sure that you have the most recent virus definitions.
  2. Start Norton AntiVirus (NAV), and run a full system scan. Be sure that NAV is configured to scan all files.
  3. Delete all files that are detected as DonaldD.Trojan.C.

To edit the registry:

CAUTION : We strongly recommend that you back up the system registry before you make any changes. Incorrect changes to the registry could result in permanent data loss or corrupted files. Please make sure that you modify only the keys that are specified. Please see the document How to back up the Windows registry before you proceed.
  1. Click Start, and click Run. The Run dialog box appears.
  2. Type regedit and then click OK. The Registry Editor opens.
  3. Navigate to and select the following key:

    HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\PON2DIL

    CAUTION: Make sure that you select \PON2DIL subkey, and not any of its parent keys.
  4. Press Delete, and then click Yes to confirm.
  5. Navigate to and select the following key:

    HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\PEN2D

    CAUTION: Make sure that you select the \PEN2D subkey, and not any of its parent keys.
  6. Press Delete, and then click Yes to confirm.
  7. Exit the Registry Editor.


Writeup By: Patrick Nolan