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AA-2006.0095                  AUSCERT Advisory

                                   [Win]
  W32.Spybot.ACYR worm spreading via Symantec and Windows vulnerabilities
                             29 November 2006
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        AusCERT Advisory Summary
        ------------------------

Operating System:     Windows
Impact:               Administrator Compromise
Access:               Remote/Unauthenticated
Member content until: Wednesday, December 27 2006

Ref:                  AL-2006.0064
                      AL-2006.0042
                      AL-2003.11
                      ESB-2005.0300
                      ESB-2005.0297
                      ESB-2004.0113

OVERVIEW:

	Symantec are reporting activity from a new worm, W32.Sypbot.ACYR, which
	attempts to exploit vulnerabilities in Symantec Client Security,
	Symantec AntiVirus products and Microsoft Windows to compromise hosts 
	and propagate [1].

	Symantec report that this worm propagates via mIRC, network shares and
	the vulnerabilities below.  They describe the global impact as 
	"minimal" so far.

	The following vulnerabilities are reported to be exploited:

	SYM06-010      (AL-2006.0042 - Symantec AV and Client Security
	                vulnerabilities)
	MS03-026       (AL-2003.11 - RPC Interface buffer overrun)
	MS05-017       (ESB-2005.0297 - MSN Messenger vulnerability)
	MS04-007       (ESB-2004.0113 - ASN.1 parser library vulnerability)
	MS05-017       (ESB-2005.0300 - Message Queuing vulnerability)
	MS06-040       (AL-2006.0064 - RPC Interface vulnerability)
	CVE-1999-0368  (Buffer overflows in wuarchive ftpd (wu-ftpd) and ProFTPD
                        lead to remote root access)


IMPACT:

	An infected machine allows SYSTEM level access to an attacker.  An
	attacker is typically able to run arbitrary commands on the system via
	an IRC control channel.


MITIGATION:

	Patch your machines against the vulnerabilities exploited by this worm
	[2].  The vulnerabilities reported as exploited have patches available.

	Block traffic to Symantec System Center services at the perimeter on TCP
	and UDP port 2967.

	Monitor for outgoing connections on port 6667, which may indicate the
	presence of this or other malware using IRC servers as a control
	mechanism.


REFERENCES:

	[1] Spybot attempts to exploit old vulnerability
	    http://www.symantec.com/enterprise/security_response/weblog/2006/11/spybot_attempts_to_exploit_old.html

	[2] W32.Spybot.ACYR
	    http://www.symantec.com/enterprise/security_response/writeup.jsp?docid=2006-112810-5302-99&tabid=2

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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