Internet Worm Characteristics
This mass-mailing worm, written in Visual Basic 6, uses Microsoft Outlook to send itself to all addresses in the Outlook Address book and addresses on the MSN Messenger contact list. It arrives in an email containing the following information:
Subject: The List
Attachment: LIST.TXT.scr
The attachment is a UPX packed PE file. When executed on the local machine, a message box of "error" is displayed whilst the worm copies itself to the System folder, and uses Outlook to propagate itself to all address found in the Outlook Address book and addresses on the MSN Messenger contact list.
The following Registry key is added to ensure the worm is executed at subsequent system startup:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\ Run\sys=C:\WINDOWS\SYSTEM\LIST.TXT.scr
Upon restarting the machine, the worm does not propagate again, and the message box is not displayed.
Symptoms
Presence of: LIST.TXT.scr (7,680 bytes) in the system directory.
Method Of Infection
When executed, the worm propagates itself to all addresses found in the Outlook Address book and addresses on the MSN Messenger contact list, using Microsoft Outlook. The worm copies itself to the System folder, modifying the Registry to run this copy at subsequent startup.
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