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

                        AL-2004.05 -- AUSCERT ALERT
                 Malicious Software Report - W32/Netsky.b
                        UNIRAS (UK Govt CERT) ALERT
                             19 February 2004
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        AusCERT Alert Summary
        ---------------------

Publisher:              UNIRAS (UK Govt CERT)
Operating System:       Windows
Impact:                 Access Privileged Data
                        Reduced Security
Access Required:        Remote

AusCERT has become aware of a new mass-mailer worm named W32/Netsky-B
(also know as Moodown.B). The worm arrives in email messages with varying
subjects and spoofed From: addresses. The worm also copies itself to
folders containing the words "Share" or "Sharing", but still requires
manual execution for infection.

AusCERT recommends upgrading all anti-virus software to use the latest
definition files as soon as they become available. See the anti-virus
vendor links for more information, removal instructions and tools:

http://www3.ca.com/virusinfo/virus.aspx?ID=38332
http://www.f-secure.com/v-descs/netsky_b.shtml
http://www.sophos.com/virusinfo/analyses/w32netskyb.html
http://www.symantec.com/avcenter/venc/data/w32.netsky.b@mm.html
http://www.trendmicro.com/vinfo/virusencyclo/default5.asp?VName=WORM_NETSKY.B

Users should remain aware of the danger of opening unsolicited email
attachments.

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      UNIRAS (UK Govt CERT) ALERT - 06/04 dated 18.02.04  Time: 14:35  
 UNIRAS is part of NISCC (National Infrastructure Security Co-ordination Centre)
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  UNIRAS material is also available from its website at www.uniras.gov.uk and
         Information about NISCC is available from www.niscc.gov.uk
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Title
=====

Malicious Software Report - W32/Netsky.b
AKA Worm.Moodown.B, W32/Netsky.B, Moodown.B.  

Detail
====== 

Reports are coming in of a new worm known as W32/Netsky.b.  This worm is spreading
rapidly.

W32/Netsky-B is a worm that spreads by email and Windows network shares. 
W32/Netsky-B copies itself into the Windows folder as services.exe. 

In order to run automatically when Windows starts up W32/Netsky-B creates the following registry entry: 

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
service= "C:\\WINDOWS\\services.exe -serv" 

W32/Netsky-B searches all mapped drives for files with the following extensions in order to find email adresses: MSG, OFT, SHT, DBX, TBB, ADB, DOC, WAB, ASP, UIN, RTF, VBS, HTML, HTM, PL, PHP, TXT and EML. 

W32/Netsky-B searches drives C: to Z: and attempts to copy itself into folders with names containing the string "share" or "sharing". 


Links:

http://www.sophos.com/virusinfo/analyses/w32netskyb.html

http://www.fsecure.com

http://www.trendmicro.com/vinfo/virusencyclo/default5.asp?VName=WORM_NETSKY.B
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For additional information or assistance, please contact the HELP Desk by 
telephone or Not Protectively Marked information may be sent via 
EMail to: uniras@niscc.gov.uk

Office Hours:
Mon - Fri: 08:30 - 17:00 Hrs
Tel: +44 (0) 20 7821 1330 Ext 4511
Fax: +44 (0) 20 7821 1686

Outside of Office Hours:
On Call Duty Officer:
Tel: +44 (0) 20 7821 1330 and follow the prompts

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UNIRAS wishes to acknowledge the contributions of Sophos for the information 
contained in this Briefing. 
- - ----------------------------------------------------------------------------------
This Briefing contains the information released by the original author. Some 
of the information may have changed since it was released. If the vulnerability 
affects you, it may be prudent to retrieve the advisory from the canonical site 
to ensure that you receive the most current information concerning that problem.

Reference to any specific commercial product, process, or service by trade 
name, trademark manufacturer, or otherwise, does not constitute or imply 
its endorsement, recommendation, or favouring by UNIRAS or NISCC.  The views 
and opinions of authors expressed within this notice shall not be used for 
advertising or product endorsement purposes.

Neither UNIRAS or NISCC shall also accept responsibility for any errors 
or omissions contained within this briefing notice. In particular, they shall 
not be liable for any loss or damage whatsoever, arising from or in connection 
with the usage of information contained within this notice.

UNIRAS is a member of the Forum of Incident Response and Security Teams (FIRST) 
and has contacts with other international Incident Response Teams (IRTs) in 
order to foster cooperation and coordination in incident prevention, to prompt 
rapid reaction to incidents, and to promote information sharing amongst its 
members and the community at large. 
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<End of UNIRAS Briefing>

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This alert is provided as a service to AusCERT's members.  As AusCERT did
not write the document quoted above, AusCERT has had no control over its   
content. 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.

NOTE: This is only the original release of the alert.  It may not be
updated when updates to the original are made.  If downloading at a later
date, it is recommended that the alert is retrieved directly from the
author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the alert above.  If you have any questions or need further information,
please contact them directly.

Previous advisories, alerts and external security bulletins can be 
retrieved from:

        http://www.auscert.org.au/render.html?cid=1977

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

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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