XM.Register

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Discovered: August 30, 2000
Updated: February 13, 2007 12:46:50 PM
Also Known As: XM.Register.A, XM.Register.B
Type: Macro


XM.Register is designed to work with the French version of Microsoft Excel. It is difficult to replicate it in other versions of Excel. There currently two known variants of XM.Register.

XM.Register makes the following changes:

· Replaces author name with a random string of 15 characters.
· Saves files in the C:\Windows\Temp\ directory only as random file names of eight characters.
· Disables the Unhide... option on the Window menu.
· Inserts the file C:\MSOffice\Excel\XLOuvrir\Normal.xls to ensure that XM.Register runs on every Excel session.
· Every 30 seconds, XM.Register searches for infected active workbooks. If it finds an uninfected workbook, it attempts to infect it.

Antivirus Protection Dates

  • Initial Rapid Release version September 05, 2000
  • Latest Rapid Release version September 05, 2000
  • Initial Daily Certified version September 05, 2000
  • Latest Daily Certified version September 05, 2000

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

Writeup By: Andre Post

Discovered: August 30, 2000
Updated: February 13, 2007 12:46:50 PM
Also Known As: XM.Register.A, XM.Register.B
Type: Macro


The module name used by XM.Register is MODULE9999. XM.Register searches all active workbooks for a module named MODULE9999. If it does not find this module in a workbook, the infection routine is triggered. The infection routine attempts to copy this viral module into any clean workbook found.

XM.Register performs the iteration every 30 seconds. A timer is set to activate the iteration function at the current time plus 30 seconds.

Screen updating is turned off, which suppresses any visual hints of a viral presence. This is done in addition to disabling alerts.

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: Andre Post

Discovered: August 30, 2000
Updated: February 13, 2007 12:46:50 PM
Also Known As: XM.Register.A, XM.Register.B
Type: Macro


Norton AntiVirus repairs any infections found.

Writeup By: Andre Post