The US Fededal Bureau of Investigation (FBI) has warned internet users that attackers are trying to spread a new variant of the Sober worm by sending out hoax FBI e-mails.
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The FBI said the false e-mails warn computer users that the FBI is monitoring their internet use. “These scam e-mails tell the recipients that their internet use has been monitored by the FBI and that they have accessed illegal websites,” the FBI said.
The e-mails carry an attachment which is described as a form that users can answer questions on. Once opened, the worm infects the user’s computer and replicates itself to other users via the affected user’s e-mail address book.
The worm uses up the victim’s computer resources and can potentially crash computer networks.
The FBI said it was investigating the matter and urged those who have received the hoax e-mail to report the matter to its Internet Crime Complaint Centre.