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Threat Advisory: McAfee AVERT Places Risk Assessment at Medium on New W32/Bagle.az@MM Virus

  • 29 September, 2004 09:04

<p>McAfee AVERT Discovers New Variant</p>
<p>SYDNEY, September 29, 2004 — McAfee, Inc., the market leader in 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/Bagle.az@MM, also known as Bagle.az. This new variant is a mass-mailing worm that comes in the form of the .EXE attachment, "bawindo.exe." To date, McAfee AVERT has received numerous reports of the virus within a two hour span, being stopped or infecting users from the field-with most of the reports arriving from a variety of country locations due to the spoofing capabilities of this variant.</p>
<p>Threat Overview</p>
<p>Bagle.az 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. It contains a remote access component and copies itself to folders that have the phrase 'shar' in the name, such as common peer-to-peer applications, including KaZaa, Bearshare and Limewire.</p>
<p>Users should be very wary and should most likely delete any email containing the following:</p>
<p>From : (address is spoofed)</p>
<p>Subject : (may be one of the following)</p>
<p>-- Re:</p>
<p>-- Re: Hello</p>
<p>-- Re: Thank you!</p>
<p>-- Re: Thanks :)</p>
<p>-- Re: Hi</p>
<p>Body Text:</p>
<p>--:)</p>
<p>--:))</p>
<p>Attachment: (may be one of the following)</p>
<p>-- Price</p>
<p>-- price</p>
<p>-- Joke</p>
<p>Threat Pathology</p>
<p>When the EXE file is run, the virus copies itself into the Windows System directory as BAWINDO.EXE. For example:</p>
<p>-- C:\WINDOWS\SYSTEM32\bawindo.exe</p>
<p>It also creates other files in this directory to perform its functions:</p>
<p>-- C:\WINDOWS\SYSTEM32\bawindo.exeopen</p>
<p>-- C:\WINDOWS\SYSTEM32\bawindo.exeopenopen</p>
<p>The following Registry key is added to hook system startup:</p>
<p>-- HKEY_CURRENT_USER\Software\Microsoft\Windows\</p>
<p>CurrentVersion\Run "bawindo" = "C:\WINDOWS\SYSTEM32\bawindo.exe"</p>
<p>A mutex is created to ensure only one instance of the worm is running at a time. One of the following mutex names is used in an attempt to stop particular variants of W32/Netsky running on the infected machine:</p>
<p>-- 'D'r'o'p'p'e'd'S'k'y'N'e't'</p>
<p>-- _-oOaxX|-+S+-+k+-+y+-+N+-+e+-+t+-|XxKOo-_</p>
<p>-- [SkyNet.cz]SystemsMutex</p>
<p>-- AdmSkynetJklS003</p>
<p>-- ____---&gt;&gt;&gt;&gt;U&lt;&lt;&lt;
</p><p>-- _-oO]xX|-S-k-y-N-e-t-|Xx[Oo-_</p>
<p>The worm opens port 81 (TCP) and a random UDP port on the victim machine.</p>
<p>System Protection and Cure</p>
<p>More information on Bagle.az and cure for this worm can be found online at the McAfee AVERT site located at http://vil.nai.com/vil/content/v_128582.htm . McAfee AVERT is advising its customers to update to the 4395 DATs to stay protected from all the current Bagle threats.</p>
<p>McAfee AVERT Labs is one of the top-ranked anti-virus and vulnerability research organisations 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 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>With headquarters in Santa Clara, Calif., McAfee, Inc. 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>NOTE: McAfee, IntruShield and VirusScan are registered trademarks or trademarks of McAfee, Inc. and/or its affiliates in the US and/or other countries. The colour red in connection with security is distinctive of McAfee brand products. All other registered and unregistered trademarks in this document are the sole property of their respective owners.</p>
<p>-ends-</p>
<p>For further information, please contact:</p>
<p>Natalie Connor</p>
<p>Tel: +61 (0)2 9956 5733</p>
<p>E-mail: natalie.connor@text100.com.au</p>

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