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    Investigations are currently being conducted as reports of targeted attacks through an unpatched security flaw in Microsoft’s Jet Database Engine has surfaced.

    This vulnerability is exploited through a specially crafted Microsoft Word document detected by Trend Micro as TROJ_EMBED.AA. The Word file launches a Microsoft Database (MDB) file detected as TROJ_MSJET.C, which serves as a mail-merge file once the document is opened. At this point the vulnerability is exploited, allowing the Word document to drop a malicious .EXE file on the affected system.

    The mentioned Word file also drops files that Trend Micro detects as the following:

  • The following sofware are vulnerable to this attack:

  • Microsoft Word 2000 Service Pack 3
  • Microsoft Word 2002 Service Pack 3
  • Microsoft Word 2003 Service Pack 2
  • Microsoft Word 2003 Service Pack 3
  • Microsoft Word 2007
  • Microsoft Word 2007 Service Pack 1 on Microsoft Windows 2000
  • Windows XP
  • Windows Server 2003 Service Pack 1
  • On the other hand, systems running under Windows Server 2003 Service Pack 2, Windows Vista, and Windows Vista Service Pack 1 are not affected by this vulnerability as they include a version of the Microsoft Jet Database Engine that is no longer vulnerable to this issue.

    More information regarding this vulnerability can be found on this advisory from Microsoft:

  • Microsoft Security Advisory (950627)
  • The Microsoft Jet (Joint Engine Technology) Database Engine is the underlying building block of Microsoft’s databases (collections of information structured in a certain way) allowing the manipulation of relational database via a single interface.

    Users are advised to keep their scan engines, applications and operating systems updated and to avoid clicking on attachments in spammed email messages.

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