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Threat Advisory: McAfee AVERT Raises Risk Assessment at Medium on New W32/Mydoom.s@MM Virus

  • 16 August, 2004 18:13

<p>McAfee AVERT Discovers New Mydoom Virus</p>
<p>SYDNEY, August 16, 2004 — McAfee, Inc. the leading provider of intrusion prevention solutions, today announced that McAfee AVERT (Anti-virus and Vulnerability Emergency Response Team), the world-class research division of McAfee, placed the risk assessment at Medium on the recently discovered W32/Mydoom.s@MM, also known as Mydoom.s. This new variant is a mass-mailing worm that comes in the form of the .EXE attachment, “photos_arc.exe.” To date, McAfee AVERT has received well over 100 reports of the virus within a three hour span, being stopped or infecting users from the field—with most of the reports arriving from Japan and Europe.</p>
<p>Threat Overview</p>
<p>Mydoom.s is a mass mailing threat that contains its own SMTP engine to construct outgoing messages. Similar to previous variants, it harvests addresses from local files and then uses the harvested addresses in the ‘From’ field to send itself. This produces a message with a spoofed “From” address. The attachment is an .EXE file with a single name, photos_arc.exe, which differs from many of the other Mydoom variants that tend to use multiple extensions. Users should be very wary and should most likely delete any email containing the following:</p>
<p>From: (spoofed From: header)</p>
<p>Subject: photos</p>
<p>Body: LOL!;))))</p>
<p>Threat Pathology</p>
<p>After being executed, Mydoom.s copies itself WINDOWS (%WinDir%) directory as rasor38a.dll and to the SYSTEM (%SysDir%) directory as winpsd.exe, to perform its functions. The following Registry key is added to hook system startup:</p>
<p>• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\
Explorer\ComDlg32</p>
<p>• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\
Explorer\ComDlg32</p>
<p>• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\
Run "winpsd" = C:\WINDOWS\System32\winpsd.exe</p>
<p>The worm then proceeds into the remote access component of the virus, where it listens for remote connections. In addition, the virus downloads a backdoor Trojan to the user’s machine and executes the threat.</p>
<p>System Protection and Cure</p>
<p>More information on Mydoom.s and cure for this worm can be found online at the McAfee AVERT site located at http://vil.nai.com/vil/content/v_127616.htm. McAfee AVERT is advising its customers to update to the 4386 DATs to stay protected from all the current Mydoom threats.</p>
<p>McAfee AVERT Labs is one of the top-ranked anti-virus and vulnerability research organizations in the world, employing researchers in thirteen countries on five continents. McAfee AVERT combines world-class malicious code and anti-virus research with intrusion prevention and vulnerability research expertise from the McAfee IntruShield and McAfee Entercept organisations, two research arms that were acquired through the IntruVert Networks and Entercept Security. McAfee AVERT protects customers by providing cures that are developed through the combined efforts of McAfee AVERT researchers and McAfee AVERT AutoImmune technology, which applies advanced heuristics, generic detection, and ActiveDAT technology to generate cures for previously undiscovered viruses.</p>
<p>About McAfee, Inc.</p>
<p>With headquarters in Santa Clara, Calif., McAfee, Inc. (NYSE: MFE) creates best-of-breed computer security solutions that prevent intrusions on networks and protect computer systems from the next generation of blended attacks and threats. McAfee’s customers span large enterprises, governments, small and medium sized businesses, and consumers. For more information, McAfee, Inc. can be reached on the Internet at http://www.mcafee.com/.</p>
<p># # #</p>
<p>NOTE: McAfee and AVERT are either registered trademarks or trademarks of McAfee, Inc. and/or its affiliates in the United States and/or other countries. All other registered and unregistered trademarks herein are the sole property of their respective owners. *2004 McAfee, Inc. All Rights Reserved.</p>
<p>For further information, please contact:</p>
<p>Natalie Connor</p>
<p>Tel: +61 (0)2 9956 5733</p>
<p>Mobile: +61 (0)417 259 054</p>
<p>E-mail: natalie.connor@text100.com.au</p>

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