Virus-like program that spreads automatically to other computers by sending itself out by email or by any other means. A program that propagates itself by attacking other machines and copying itself to the affected machine.
Worms have self-replicating code that travels from machine to machine by various means. A worms first objective is merely propagation. Worms can be destructive depending on what payload they have been given. Worms may replace files, but do not insert themselves into files.
The infection spreads by running a file in circulation on Russian webhosting sites claiming to have a "virtual card" waiting for them - when the file is run, a picture of a heart containing a poem is launched, and the infected user will pass the infection link to their contacts on MSN Messenger with the phrase "olha o que eu fiz pra vc....curti ai...[url removed]"
Immediately after installation, it downloads a file from a Russian domain. Then it opens up a .gif. Then it makes a call back to the before mentioned domain and downloads another file.
It also sends information about your computer to the distributor's e-mail address through an SMTP connection. This includes internal network information such as devices on the network.