NetAV is the worm that spreads in email messages. email 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.
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
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:
This way the worm starts during all Windows sessions. To disinfect the worm it's enough to delete its file from Windows System folder.
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