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AusCERT Update AU-2006.0029 - [Win]
New MocBot variants exploiting recent Microsoft vulnerability
14 August 2006

        AusCERT Update Summary
        ----------------------

Operating System:     Windows Server 2003
                      Windows XP
                      Windows 2000
Impact:               Administrator Compromise
Access:               Remote/Unauthenticated

OVERVIEW:

        Two new versions of the MocBot worm have emerged that exploit the
        vulnerability described in Microsoft Bulletin MS06-040 [1][2].

        These variants are currently active.


IMPACT:

        Unpatched machines may be infected without user interaction. Once
        infected that machine may be controlled remotely via IRC to spread
        to further machines, launch denial of service attacks or other
        malicious activities. Unsuccessful infection attempts may cause
        Windows to crash.


MITIGATION:

        Installing the patch listed in MS06-040 either manually or via
        Windows or Microsoft Update effectively protects against this worm.
        AusCERT recommends users examine their exposure to this worm and
        patch as soon as possible.


DETAILS:

        As MocBot contains hard-coded server names, administrators should
        monitor for traffic to the following domain names and IPs as it may
        be a sign of infection. Note that full-stops have been replaced with
        commas.

           bniu,househot,com
           ypgw,wallloan,com
           61,189,243,240
           202,121,199,200
           210,75,211,111
           211,154,135,30
           218,61,146,86
           58,81,137,157
           61,163,231,115


REFERENCES:

        [1] Microsoft Bulletin MS06-040
            http://www.microsoft.com/technet/security/bulletin/ms06-040.mspx

        [2] AusCERT Alert AL-2006.0064
            http://www.auscert.org.au/6591

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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