Hannaford Brothers supermarket chain
is trying to determine exactly how malicious software got onto
computer servers in nearly all of its 271 stores, enabling someone
to access millions of credit and debit card numbers.
The Scarborough-based company told Massachusetts regulators this
week that ":malware": — short for malicious software — was
secretly installed on its supermarkets’ servers in the Northeast
and in Florida.
The software allowed some 4.2 million credit and debit card
numbers to be compromised. At least 1,800 cases of fraud have been
linked to the data breach, with unauthorized charges showing up as
far away as Mexico, Italy and Bulgaria.
Hannaford spokeswoman Carol Eleazer said there are still many
aspects of the breach that the company doesn’t yet understand.
The breach remains under investigation by the U.S. Secret