W32.HLLP.Systemp

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Discovered: March 21, 2003
Updated: February 13, 2007 11:44:44 AM
Type: Virus
Systems Affected: Windows


W32.HLLP.Systemp is a parasitic virus written in C++ (a high-level language), using the MFC libraries. Once W32.HLLP.Systemp is executed, it will insert a backdoor on the user's system.

Antivirus Protection Dates

  • Initial Rapid Release version March 24, 2003
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version March 24, 2003
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date March 26, 2003

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

Writeup By: Atli Gudmundsson

Discovered: March 21, 2003
Updated: February 13, 2007 11:44:44 AM
Type: Virus
Systems Affected: Windows


When W32.HLLP.Systemp is executed, it performs the following actions:

  1. Creates the following files
    • %System%\Systempm.exe
    • %Windir%\Systray.exe
    • %System%\Sysddzg.dll
    • %System%\~temddz

      NOTES:
      • %Windir% is a variable. The virus locates the Windows installation folder (by default, this is C:\Windows or C:\Winnt) and copies itself to that location.
      • %System% is a variable. The virus locates the System folder and copies itself to that location. By default, this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).

  2. Adds the value:

    SysTray %Windir%\SysTray.exe

    to the registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
  3. On Windows 9x/Me systems, W32.HLLP.Systemp will also delete the registry value: SysTray

    under the registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
  4. Then, W32.HLLP.Systemp will create a duplicate host file, with the Hidden attribute set, in the same location as the infected file, as

    ÿ<name of infected file>

    Then, W32.HLLP.Systemp will proceed to execute the original host.

    NOTE: This duplicate host file is not binary-compatible with the original host file, as the virus changes its icon to the one used for the files with no association.
  5. Proceeds to infect files with the .exe file extension on the current hard drive.

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.

Writeup By: Atli Gudmundsson

Discovered: March 21, 2003
Updated: February 13, 2007 11:44:44 AM
Type: Virus
Systems Affected: Windows


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

  1. Update the virus definitions.
  2. Do one of the following:
    • Windows 95/98/Me: Restart the computer in Safe mode.
    • Windows NT/2000/XP: End the Trojan process.

  3. Run a full system scan. Delete all the files detected as Backdoor.Trojan and repair all the files detected as W32.HLLP.Systemp.
  4. Reverse the changes that the Trojan made to the registry.
  5. Delete the following files:
    • %System%\Sysddzg.dll
    • %System%\~temddz
    • Any files starting with the character ÿ


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

1. Updating 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 the Virus Definitions (LiveUpdate).
  • Downloading the definitions using the Intelligent Updater: The Intelligent Updater virus definitions are posted on U.S. business days (Monday through Friday). 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 the Virus Definitions (Intelligent Updater).

    The Intelligent Updater virus definitions are available here. For detailed instructions on how to download and install the Intelligent Updater virus definitions from the Symantec Security Response Web site, click here.

2. Restarting the computer in Safe mode or ending the Trojan process
    Windows 95/98/Me
    Restart the computer in Safe mode. All the Windows 32-bit operating systems, except for Windows NT, can be restarted in Safe mode. For instructions on how to do this, read the document, "How to start the computer in Safe Mode."

    Windows NT/2000/XP
    To end the Trojan process:
    1. Press Ctrl+Alt+Delete once.
    2. Click Task Manager.
    3. Click the Processes tab.
    4. Double-click the Image Name column header to alphabetically sort the processes.
    5. Scroll through the list and look for Systray.exe.
    6. If you find the file, click it, and then click End Process.
    7. Exit the Task Manager.
3. Scanning for and deleting the infected files
  1. Start your Symantec antivirus program and make sure that it is configured to scan all the files.
  2. Run a full system scan.
  3. If any files are detected as infected with Backdoor.Trojan, click Delete.
  4. If any files are detected as infected with W32.HLLP.Systemp, click Repair.

4. Reversing the changes made to the registry

CAUTION: Symantec strongly recommends that you back up the registry before you make any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify the specified keys only. Read the document, "How to make a backup of the Windows registry ," for instructions.
  1. Click Start, and then click Run. (The Run dialog box appears.)
  2. Type regedit

    Then click OK. (The Registry Editor opens.)
  3. Navigate to the key:

    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
  4. Do one of the following:
    • Windows 98/Me: In the right pane, double-click the value, SysTray. Change the Value Data to SysTray.exe, and then click OK.
    • Windows NT/2000/XP: In the right pane, delete the value, SysTray.
  5. Exit the Registry Editor.

5. Deleting the files
Ensure that Explorer is set to Show All Files:
    To configure Windows to show all the files:
    1. Start Windows Explorer.
    2. Click the View menu (Windows 95/98/NT) or the Tools menu (Windows Me/2000/XP), and then click Options or "Folder options."
    3. Click the View tab.
    4. Uncheck "Hide file extensions for known file types."
    5. Do one of the following:
      • Windows 95/NT: Click "Show all files."
      • Windows 98: In the Advanced settings box, under the "Hidden files" folder, click Show all files.
      • Windows Me/2000/XP: Uncheck "Hide protected operating system files," and under the "Hidden files" folder, click "Show hidden files and folders."
    6. Click Yes if you see a Warning dialog box.
    7. Click Apply, and then click OK.

Follow the instructions for your operating system:
    Windows 95/98/Me/NT/2000
    1. Click Start, point to Find or Search, and then click Files or Folders.
    2. Make sure that "Look in" is set to (C:) and that "Include subfolders" is checked.
    3. In the "Named" or "Search for..." box, type, or copy and paste, the following filenames:

      sysddzg.dll ~temddz ÿ
    4. Click Find Now or Search Now.
    5. Delete the displayed files.
    Windows XP
    1. Click Start, and then click Search.
    2. Click All files and folders.
    3. In the "All or part of the file name" box, type, or copy and paste, the following filenames:

      sysddzg.dll ~temddz ÿ
    4. Verify that "Look in" is set to "Local Hard Drives," or to (C:).
    5. Click "More advanced options."
    6. Check "Search system folders."
    7. Check "Search subfolders."
    8. Click Search.
    9. Delete the displayed files.


Writeup By: Atli Gudmundsson