F-SECURE said there's a new worm in the wild which spreads itself using MSN Messenger. The worm - called Bropia.A - disseminates itself by files claiming to be funny or lewd pictures with filenames such as love_me.pif, drunk_lol.pif and the like.
F-Secure said that contacts are harvested from client machines by snooping on MSN windows using Windows hooks.
The worm also throws backdoor software, a variant of Rbot, on infected machines. This copies itself as LEXPLORE.EXE The zombie logs keystrokes, harvests system information, and generally makes a nuisance of itself.
F-Secure has some more advice about the worm,
here. Source : TheInquirer