A new virus has been detected by Seculert on point of sale terminals in the United States, Britain and Canada.

“Dexter” forwards information from debit and credit cards directly to fraudsters who can duplicate cards.

Seculert estimates that hundreds of terminals have been infected, in 40 nations, so it’s best to keep an eye out for odd transactions on your bank statements and credit card bills.

You should also consider enabling email and/or mobile alerts on your accounts, as an extra security measure.