Here is what I got from Computer Associates. The website for their Virus Encyclopedia is
Win32.Funso worm (also known as I-Worm.Menace)
Win32.Funso worm arrives in an email that has one of the following subject lines:
Fwd: This is great! =)
Fwd: This is hilarious! =)
The message body is:
You guys have to download this! This really is funny!
The attachment is called "sofunny.exe".
When run, the worm displays the following fake error message:
It copies itself to "C:\WINDOWS\SOFUNNY.exe" and "C:\WINDOWS\msdos423.exe" and adds a key to the registry so that it is loaded every time Windows starts:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\msdos423="c:\windows\msdos423.exe"
Note that it always uses the directory "C:\WINDOWS" even if Windows is installed in a different location.
The worm also creates a file called "C:\WINDOWS\msdos423.ini" which it uses to keep track of its progress. Initially this file contains the following:
[Setup]
Copied=True
The worm sends itself to other people using the AOL client software. It also steals AOL passwords and attempts to send them to a third party, presumably the worm author, using one of the following mail servers:
mail.yahoo.com
mail.hotmail.com
mail.angelfire.com
Thanks,
Vince