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             AUSCERT External Security Bulletin Redistribution

           ESB-2004.0310 -- Trend Micro MEDIUM Risk Virus Alert
                      WORM_NETSKY.AB and WORM_BAGLE.Z
                               30 April 2004


        AusCERT Security Bulletin Summary

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


The following two Trend Micro virus alerts provide information on the recent
detections of the Netsky.AB and Bagle.Z viruses. Further information is
available from additional anti-virus vendors, as listed below.

- - http://www3.ca.com/threatinfo/virusinfo/virus.aspx?id=39001
- - http://www.f-secure.com/v-descs/netskyab.shtml
- - http://us.mcafee.com/virusInfo/default.asp?id=description&virus_k=124873
- - http://www.sophos.com/virusinfo/analyses/w32netskyab.html
- - http://securityresponse.symantec.com/avcenter/venc/data/w32.netsky.ab@mm.html

Bagle.Z (aka Beagle.X, Bagle.aa)
- - http://www3.ca.com/threatinfo/virusinfo/virus.aspx?id=39002
- - http://www.f-secure.com/v-descs/bagle_z.shtml
- - http://us.mcafee.com/virusInfo/default.asp?id=description&virus_k=124875
- - http://www.sophos.com/virusinfo/analyses/w32bagleaa.html
- - http://securityresponse.symantec.com/avcenter/venc/data/w32.beagle.x@mm.html

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As of April 28, 2004 1:20 AM PST, TrendLabs has declared a Medium Risk Virus
Alert to control the spread of WORM_NETSKY.AB. TrendLabs has received several
infection reports indicating that this malware is spreading in Japan, Taiwan
and Korea. There are also infections in Europe, particularly in France.

This NETSKY variant propagates via email. To spread, it sends copies of
itself via SMTP (Simple Mail Transfer Protocol). It harvests email addresses
from files located in local drives C to Z, and with particular extension names. 

This malware also deletes Windows registry entries created by the BAGLE worm. 

TrendLabs will be releasing the following EPS deliverables:

            TMCM Outbreak Prevention Policy 108
            Official Pattern Release 873
            Damage Cleanup Template 327

For more information on WORM_NETSKY.AB, you can visit our Web site at:


As of April 28, 2004  11:34 AM PST, TrendLabs has declared a Medium Risk
Virus Alert to control the spread of WORM_BAGLE.Z. TrendLabs has received
several infection reports indicating that this malware is spreading in Europe
and the US. 
This BAGLE variant propagates via email and network shares. It drops a copy
of itself in the Windows system folder as the following files:  
The attachment it sends out can have COM, CPL, EXE, HTA, SCR, VBS, and ZIP
extension names. The email it sends out contains a message body only if the
attached file is a .ZIP password-protected file. 
In its attempt to propagate through network shares, it drops copies of itself
in folders that contain the string "shar" in their folder names. It also has
backdoor capabilities. It creates a separate thread and listens to port 2535
for remote commands.  
This UPX-compressed malware runs on Windows 95, 98, ME, NT, 2000, and XP.  
TrendLabs will be releasing the following EPS deliverables: 
            TMCM Outbreak Prevention Policy 109 
            Official Pattern Release 877 
            Damage Cleanup Template 329

For more information on WORM_BAGLE.Z, you can visit our Web site at:


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