X97M.Booklet.A

Printer Friendly Page

Discovered: January 29, 2002
Updated: February 13, 2007 12:46:54 PM
Type: Macro


X97M.Booklet.A is a macro virus that infects macros in Microsoft Excel files.

Antivirus Protection Dates

  • Initial Rapid Release version January 29, 2002
  • Latest Rapid Release version January 29, 2002
  • Initial Daily Certified version January 29, 2002
  • Latest Daily Certified version January 29, 2002

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


Technical Description


This macro virus activates when an infected file is opened. It performs the following actions:

  1. First, it checks if the user name is "booky". If it is not, it sets the user name to "booky".
  2. Next, it saves the infected workbook in the \XLStart folder as Booky.xls. This is done so that the virus can infect other workbooks when they are opened.
  3. It then sets the status bar to display the text "BookY RuLz Hir...Hehehe"
  4. Finally, it searches through the files that are listed in the recently used file list. Each file is checked to see if it is infected already.
    • If it finds an infected file, then it immediately closes the active workbook.
    • If it finds an uninfected file, then it infects that file, saves the active workbook and closes it.

This virus unsuccessfully attempts to be polymorphic and it contains many programming bugs, which may result in corrupting itself to the extent that it does not function any more after several replications.

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.


Removal


Run LiveUpdate to make sure that you have the most recent virus definitions.

  1. Start Norton AntiVirus (NAV), and make sure that NAV is configured to scan all files. For instructions on how to do this, read the document How to configure Norton AntiVirus to scan all files.
  2. Run a full system scan.
  3. If any files are detected as infected by X97M.Booklet.A, click Repair. Any files that are corrupted and cannot be repaired should be deleted and restored from a clean backup copy.


Writeup By: Andre Post