We use cookies to provide you with a better experience. If you continue to use this site, we'll assume you're happy with this. Alternatively, click here to find out how to manage these cookies

hide cookie message
80,259 News Articles

'Non-delivery report' spam surges

NDRs responsible for 20% of worldwide spam

Non-delivery report (NDR) spam has increased by 2000 percent in August since June this year, says PandaLabs.

An NDR is an email automatically sent by mail systems to advise senders of problems delivering their messages. These messages are usually legitimate, but cyber criminals are exploiting this function to distribute spam, using the sender's real name.

The security firm revealed that the spam content is usually sent as an attachment to the fake non-delivery notice and while, in most cases, recipients have not sent the supposedly undelivered email, they still become curious and open it

PandaLabs said that these messages account for 20 percent of all global spam.

"There is presently no consensus on whether NDRs are a technique to evade antispam filters or a collateral effect of dictionary attacks; either way, this technique is now among the most widely used," said Luis Corrons, technical director of PandaLabs.

"These waves of spam are usually generated through botnets," he added.

Broadband speed test

PC security advice

See also: Malware used for ID theft on the rise

IDG UK Sites

Samsung Galaxy S6 launch as it happened: Galaxy S6 launch video and live blog - watch again as...

IDG UK Sites

5 things we hate about MWC: What it's like to be a journalist at a technology trade show

IDG UK Sites

Interview: Lauren Currie aims to help design students bridge skills gap

IDG UK Sites

12in Retina MacBook Air release date rumours: new MacBook Air to have fingerprint ID, could launch...