When executed, the worm will first copy itself to following locations:
Then VBS/Mill.F creates a batch file "C:\Windows\System\SeasonGreeting\SeasonGreetingAutoExec.bat" which will delete all files with ".txt", ".exe" and ".zip" extensions
files from "C:\My Documents" directory; and files with ".mp3" and
".mp2" files from "C:\My Music" and "C:\My Documents\My Music"
Next the worm modifies the registry in such way that the worm will be
executed on the next restart. It also changes Windows' registered
owner to "EvilSanta", the product name to "SUX Windows 2004", as well
as desktop picture and mouse and keyboard settings.
The worm searches for files with a different extension than ".vbs"
from the root of the "C:" drive and from the "C:\My Documents"
directory, and if found, creates an additional file with exensions
".txt" and ".vbs" with a big number of spaces between them. This file
contains the worm itself
The worm speads itself via different ways, using mIRC and Outlook.
With mIRC it sends itself as "SeasonGreeting.txt.vbs" when an infected
user joins an IRC channel.
Finally the worm sends itself using Outlook application. The message
that it sends looks as follows:
Subject: You got a Christmas E-Card from you friend!"
Body: Wishing you a Merriest Christmas!! ;)
You got a Christmas Electronic Card from you friend!!
Please open attachment to view E-Card
E-Card Brought To You By,
[Analysis: Katrin Tocheva and Sami Rautiainen, F-Secure; December 2000]