|NDR spam up 2 000%|
Wednesday, 30 September 2009 02:00
Security software company Panda Security recorded a 2 000% increase in the amount of different non-delivery report spam messages in circulation, compared to the number of samples detected between January and June this year.
The company describes a non-delivery report (NDR) as an e-mail automatically sent by mail systems to advise senders of problems delivering their messages.
These messages are usually legitimate, but this mail server function is being exploited by spammers to distribute spam, using the sender`s real name, adds Panda.
The spam content is usually sent as an attachment to the fake non-delivery notice, states the company. Although in most cases users have not sent the supposedly undelivered e-mail, they still become curious and open it.
“There is presently no consensus on whether NDRs are a technique to evade anti-spam filters or a collateral effect of dictionary attacks,” says Jeremy Matthews, head of Panda`s sub-Saharan operations.
These waves of spam are usually generated through botnets. Since most NDRs are legitimate e-mails and part of the mail server functionality, many traditional anti-spam techniques do not detect or block them, adds Matthews.
Panda has developed specific technologies for this type of spam, concludes the company.
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