Article ID: 812811 - View products that this article applies to.
W32.Lirva.A@mm is a new e-mail worm. The Microsoft Product Support Services Security team is issuing this alert to advise customers to be aware of this virus as it spreads in the wild. If you use best practices, such as filtering certain file types and applying security patches, you can prevent infection from this mass-mailer worm.
Note By default, Microsoft Office Outlook 2003 and Microsoft Office Outlook 2007 provide protection against the W32.Lirva.A@mm mass-mailer worm.
Impact of attackMass-mailing, Termination of Antivirus Programs and Firewalls, and Compromise of Cached Passwords
Technical detailsW32.Lirva.A@mm is a new mass-mailer worm that also propagates through shares and peer-to-peer file-sharing applications. The W32.Lirva.A@mm worm arrives in an e-mail message that has the following characteristics:
Note The contents vary. The following message is only one example.
Subject: Re: Reply on account for IFRAME-Security breachThe worm tries to exploit a previously patched vulnerability that exists in some versions of Microsoft Outlook, Microsoft Outlook Express, and Microsoft Internet Explorer. This vulnerability can be used to allow an executable attachment to run automatically, even if you do not double-click the attachment. For more information about this vulnerability, visit the following Microsoft Web site:
Patch is also provided to subscribed list of Microsoft Tech Support: to apply the patch immediately. Microsoft strongly urges all customers using IIS 4.0 and 5.0 who have not already done so and do not need to take additional action. Customers who have applied that patch are already protected against the vulnerability that is eliminated by a previously-released patch. Microsoft has identified security vulnerability in Microsoft IIS 4.0 and 5.0. To prevent from the further buffer overflow attacks apply the MSO-patch.
Attachment (including, but not limited to): Resume.exe, AvrilLavigne.exe, AvrilSmiles.exe, CERT-Vuln-Info.exe, IAmWiThYoU.exe, MSO-Patch-0035.exe, MSO-Patch-0071.exe, Readme.exe, Singles.exe, Sophos.exe
http://www.microsoft.com/technet/security/bulletin/MS01-020.mspxUpon execution, the worm tries to disable some antivirus and firewall applications that may be running on the computer. The worm also does one or more of the following:
RecoveryIf your computer has been infected with this virus, contact Microsoft Product Support Services or your preferred antivirus vendor for help with removing the virus. For information about how to contact Microsoft Product Support Services, visit the following Microsoft Web site
Related security informationFor additional information about viruses, visit the following third-party Web sites:
http://firstname.lastname@example.orgMicrosoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.
For additional security-related information about Microsoft products, visit the following Microsoft Web site:
Article ID: 812811 - Last Review: October 9, 2011 - Revision: 9.0