FRISK Software International


Summary of W32/Netav@mm
Alias: I-Worm.Netav
Discovered: 11 Jul 2002
Definition files: 11 Jul 2002
 
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Brief description
Technical description
Removal Instructions

Brief Description
NetAV is the worm that spreads in e-mail messages. E-mail addresses are collected from the users' Address Book and HTML files located in the 'Temporary Internet Files' folder. Every Tuesday the worm searches for *.DOC files in the 'My Documents' folder and, if there are several files there, picks one randomly and sends it out. The worm does not spread on Tuesday, it only sends *.DOC files out.


Technical Description

Every Thursday the worm regenerates the new address list that stores in the ICMAIL.DLL file in the Windows System directory.

This worm sends itself with the following subject lines:


 Hello
 For you
 Try it
 Re:

and the following bodies: 


 Hi
 Here is what you asked, bye.


 Hello
 Maybe you could help me with this, bye.


 Hello
 Now you can try it, bye.

The following names are given to the worm's attachment:


 HGAME.EXE
 MININET.EXE
 NETAV.EXE

Subject, body and attachment name are selected randomly from the above given list.

When the worm is first started it shows a fake error message:

This file does not work on this system" 

And then it installs itself to system. It copies itself to Windows System Directory as 'NETAV.EXE' file. Then it adds the path of that file to the System Registry:

 [HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run\NETAV Agent]

This way the worm starts during all Windows sessions.



Removal Instructions
To disinfect the worm it's enough to delete its file from Windows System folder.

 


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Authentium

perComp Verlag
(in German)
 

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