US-CERT Technical Cyber Security Alert TA09-088A -- Conficker Worm Targets Microsoft Windows Systems

31/03/09, US-CERT Technical Cyber Security Alert TA09-088A -- Conficker Worm Targets Microsoft Windows Systems
From: CERT Advisory <cert-advisory@cert.org>

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To: cert-advisory@cert.org
Subject: US-CERT Technical Cyber Security Alert TA09-088A -- Conficker Worm Targets Microsoft Windows Systems
From: CERT Advisory <cert-advisory@cert.org>
Date: Mon, 30 Mar 2009 15:11:40 -0400
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                    National Cyber Alert System

              Technical Cyber Security Alert TA09-088A


Conficker Worm Targets Microsoft Windows Systems

   Original release date: March 29, 2009
   Last revised: March 30, 2009
   Source: US-CERT


Systems Affected

     * Microsoft Windows


Overview

   US-CERT is aware of public reports indicating a widespread
   infection of the Conficker/Downadup worm, which can infect a
   Microsoft Windows system from a thumb drive, a network share, or
   directly across a corporate network, if the network servers are not
   patched with the MS08-067 patch from Microsoft.


I. Description

   Home users can apply a simple test for the presence of a
   Conficker/Downadup infection on their home computers.  The presence
   of a Conficker/Downadup infection may be detected if a user is
   unable to surf to their security solution website or if they are
   unable to connect to the websites, by downloading detection/removal
   tools available free from those sites:
   
   * http://www.symantec.com/norton/theme.jsp?themeid=conficker_worm&inid=us_ghp_link_conficker_worm
   * http://www.microsoft.com/protect/computer/viruses/worms/conficker.mspx
   * http://www.mcafee.com
   
   If a user is unable to reach any of these websites, it may indicate
   a Conficker/Downadup infection.  The most recent variant of
   Conficker/Downadup interferes with queries for these sites,
   preventing a user from visiting them.  If a Conficker/Downadup
   infection is suspected, the system or computer should be removed
   from the network or unplugged from the Internet - in the case for
   home users.


II. Impact

   A remote, unauthenticated attacker could execute arbitrary code on
   a vulnerable system.


III. Solution

   Instructions, support and more information on how to manually
   remove a Conficker/Downadup infection from a system have been
   published by major security vendors.  Please see below for a few of
   those sites. Each of these vendors offers free tools that can
   verify the presence of a Conficker/Downadup infection and remove
   the worm:
   
   Symantec:
   http://www.symantec.com/business/security_response/writeup.jsp?docid=2009-011316-0247-99

   Microsoft:
   http://support.microsoft.com/kb/962007
   
   http://www.microsoft.com/protect/computer/viruses/worms/conficker.mspx
   
   Microsoft PC Safety hotline at 1-866-PCSAFETY, for assistance.

   US-CERT encourages users to prevent a Conficker/Downadup infection by
   ensuring all systems have the MS08-067 patch (see
   http://www.microsoft.com/technet/security/Bulletin/MS08-067.mspx),
   disabling AutoRun functionality (see
   http://www.us-cert.gov/cas/techalerts/TA09-020A.html), and
   maintaining up-to-date anti-virus software.


IV. References

 * Microsoft Windows Does Not Disable AutoRun Properly -
   <http://www.us-cert.gov/cas/techalerts/TA09-020A.html>

 * Virus alert about the Win32/Conficker.B worm -
   <http://support.microsoft.com/kb/962007>

 * Microsoft Security Bulletin MS08-067 - Critical -
   <http://www.microsoft.com/technet/security/Bulletin/MS08-067.mspx>

 * MS08-067: Vulnerability in Server service could allow remote code
   execution -
   <http://support.microsoft.com/kb/958644>

 * The Conficker Worm -
   <http://www.symantec.com/norton/theme.jsp?themeid=conficker_worm>

 * W32/Conficker.worm -
   <http://us.mcafee.com/root/campaign.asp?cid=54857>

 * W32.Downadup Removal Tool -
   <http://www.symantec.com/business/security_response/writeup.jsp?docid=2009-011316-0247-99>

 ____________________________________________________________________

   The most recent version of this document can be found at:

     <http://www.us-cert.gov/cas/techalerts/TA09-088A.html>
 ____________________________________________________________________

   Feedback can be directed to US-CERT Technical Staff. Please send
   email to <cert@cert.org> with "TA09-088A Feedback VU#827267" in
   the subject.
 ____________________________________________________________________

   For instructions on subscribing to or unsubscribing from this
   mailing list, visit <http://www.us-cert.gov/cas/signup.html>.
 ____________________________________________________________________

   Produced 2009 by US-CERT, a government organization.

   Terms of use:

     <http://www.us-cert.gov/legal.html>
 ____________________________________________________________________

Revision History
  
  March 29, 2009: Initial release
  March 30, 2009: Included additional details

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