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:

 For you
 Try it

and the following bodies: 

 Here is what you asked, bye.

 Maybe you could help me with this, bye.

 Now you can try it, bye.

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


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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