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             AUSCERT External Security Bulletin Redistribution

           ESB-2004.0513 -- Trend Micro MEDIUM Risk Virus Alert 
                WORM_RATOS.A (MyDoom.S, MyDoom.Q, MyDoom.R)
                              17 August 2004

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        AusCERT Security Bulletin Summary
        ---------------------------------

Publisher:              Trend Micro
Operating System:       Windows
Impact:                 Execute Arbitrary Code/Commands

Ref:                    AL-2004.02
                        AU-2004.010

Comment: The following Trend Micro virus alert provides information on the
         recent detection of the RATOS.A virus.  Further information is
         available from additional anti-virus vendors as listed below.
                  
         MyDoom.S
         
         http://www3.ca.com/securityadvisor/virusinfo/virus.aspx?id=39890
         http://vil.nai.com/vil/content/v_127616.htm
         http://www.sophos.com/virusinfo/analyses/w32mydooms.html
         http://www.f-secure.com/v-descs/mydoom_s.shtml
         
         MyDoom.R
         
         http://www.pandasoftware.com/virus_info/encyclopedia/overview.aspx?IdVirus=50987&sind=0
         
         MyDoom.Q
         
         http://securityresponse.symantec.com/avcenter/venc/data/w32.mydoom.q@mm.html

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As of Aug 16, 2004 12:10 AM (GMT -7:00), TrendLabs has declared a Medium Risk 
Virus Alert to control the spread of WORM_RATOS.A. TrendLabs has received 
several infection reports indicating that this malware is spreading in Japan, 
Korea and the United States.

This worm spreads via email with the following details:

- ------
Subject: photos
Message body: LOL!;))))
Attachment: photos_arc.exe 
- ------

Upon execution, it drops a copy of itself as the following files: 

• %Windows%\RASOR38A.DLL 
• %System%\WINPSD.EXE 

(Note: %System% refers to the Windows system folder, which is usually 
C:\Windows\System on Windows 95, 98, and ME, C:\WINNT\System32 on Windows 2000 
and NT, and C:\Windows\System32 on Windows XP. Note: The Windows system folder is 
usually C:\Windows\System on Windows 95, 98, and ME, C:\WINNT\System32 on Windows 
2000 and NT, and C:\Windows\System32 on Windows XP.)

It downloads copies of a backdoor component file from several URLs and saves it as
WINVPN32.EXE in the Windows folder. 

This worm usually arrives UPX-compressed and runs on Windows 95, 98, ME, NT, 
2000, and XP.


TrendLabs will be releasing the following EPS deliverables:

            TMCM Outbreak Prevention Policy 126 (available)
            Official Pattern Release 1.957.00 (available)
            Damage Cleanup Template 394 (to be released)
            Network Virus Pattern  10136  (to be released)


TrendLabs is currently working to provide a more in-depth analysis of this malware. 
You can visit our Web site for more updates on WORM_RATOS.A:

http://www.trendmicro.com/vinfo/virusencyclo/default5.asp?VName=WORM_RATOS.A

Contact av_query@support.trendmicro.com for inquiries and to report infections in your region.

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

Internet Email: auscert@auscert.org.au
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