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AL-2006.0082 -- [Win] -- New trojan spam targeting unpatched Internet Explorer VML vulnerability

Date: 22 September 2006
References: AL-2006.0081  AU-2006.0034  ESB-2006.0697  

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===========================================================================
A  U  S  C  E  R  T                                           A  L  E  R  T

                       AL-2006.0082 -- AUSCERT ALERT
                                   [Win]
  New trojan spam targeting unpatched Internet Explorer VML vulnerability
                             22 September 2006

===========================================================================

        AusCERT Alert Summary
        ---------------------

Operating System:     Windows
Impact:               Execute Arbitrary Code/Commands
Access:               Remote/Unauthenticated
CVE Names:            CVE-2006-3866

Ref:                  AL-2006.0081

OVERVIEW

        A new spam email purporting to be from the Commonwealth Bank of
        Australia directs unsuspecting users to sites that use the recently
        discovered unpatched Internet Explorer VML processing
        vulnerability [1] to attempt to install malware.

        At the moment this appears to be wide-spread with well over 1000
        emails reported in a single organisation.


IMPACT

        Users who follow the links contained within the email with a
        vulnerable version of Internet Explorer may become infected with
        an unknown trojan. As this trojan is linked to an email referencing
        a financial institution it is likely it will attempt to steal
        authentication details for the purpose of financial fraud.


DETAILS

        The malicious email pretends to be from the 'Commonwealth Bank Group',
        however the actual from address changes from message to message.

        The content references 'Wealth Creator Magazine' with claims that
        the Commonwealth Bank is offering 11% interest rates on term deposits.

        Links with the following domains are quoted twice in the message:

            www,wealthcreatorau,com
            www,wealthcreatorau,net
            www,wealthcreatorau,org

        Note that the above domains have been deliberately altered to avoid
        spam detection.


MITIGATION

        Site administrators are advised to block all incoming email matching
        the above description, and users are advised to delete any of these
        messages that they receive without following any links contained
        within.

        Site administrators should also examine their logs for HTTP traffic
        to and from the above domains or any URLs containing:

            commpromo,html
            go,php
            demo,php
            cgi-bin/ie0609,cgi

        Such traffic may be indicative of infected users. Note that the
        above strings have been modified to avoid spam detection - periods
        have been replaced with commas.


REFERENCES

        [1] AusCERT Alert AL-2006.0081
            http://www.auscert.org.au/6758

AusCERT has made every effort to ensure that the information contained
in this document is accurate.  However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================

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