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  3. W32.Stration@mm

W32.Stration@mm

Risk Level 2: Low

Discovered:
September 20, 2006
Updated:
February 13, 2007 1:00:43 PM
Type:
Worm
Systems Affected:
Windows 2000, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP


Once executed, worms from the W32.Stration family may perform some of the following actions:

  1. Contacts remote hosts.

  2. Downloads and executes remote files.

  3. Gathers email addresses from the compromised computer.

  4. Sends itself to the email addresses that have been gathered. The email may have some of the following characteristics:

    From:
    [SPOOFED]

    Subject:
    One of the following:

    • Good Day
    • Server Report
    • hello
    • picture
    • Status
    • test
    • Error
    • Mail Delivery System
    • Mail Transaction Failed
    • Mail server report.

      Message:
      One of the following:

    • The message contains Unicode characters and has been sentas a binary attachment.
    • Mail transaction failed. Partial message is available.
    • The message cannot be represented in 7-bit ASCII encodingand has been sent as a binary attachment
    • Mail server report. Our firewall determined the e-mails containing worm copies are being sent from your computer. Nowadays it happens from many computers, because this is a new virus type (Network Worms). Using the new bug in the Windows, these viruses infect the computer unnoticeably. After the penetrating into the computer the virus harvests all the e-mail addresses and sends the copies of itself to these e-mail addresses. Please install updates for worm elimination and your computer restoring.
      Best regards,
      Customers support service


      Attachment:
      One of the following:

    • body
    • data
    • doc
    • docs
    • document
    • file
    • message
    • readme
    • test
    • text
    • Update-KB[RANDOM NUMBER]-x86

    Note: The file name of the attachment may use a double extension, for example body.txt.exe.


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: Yana Liu
Summary| Technical Details| Removal

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