W32/FunnyFile-A is a worm which uses Microsoft's MSN Messenger program to spread. The worm only affects users who have installed MSN Messenger programs.
If the worm is run on a system without the MSN Messenger program, the message below is displayed:
Run-time Error '91'.
Object variable or With block variable not set
The worm either sends itself as a reply to a newly-arrived message or when the user adds a new contact into the MSN Messenger contacts list.
The body of the message contains the text:
"i have a file for u. its real funny." .