A new version of the Sober worm appeared on the Internet early Friday morning and already it is having quite a bit of success infecting users in Europe through the use of social engineering. Sober.J arrives in an e-mail message that appears to be a returned-mail error message, telling the user that an e-mail sent earlier has bounced. The message typically contains a .zip, .bat, .com, .scr or .pif attachment.