How did the hackers change the DNS records
for the football site's website?
While there are currently almost 200,000 Internet mail domains that have published SPF entries in their DNS records
, this is only a fraction of the e-mail domains registered on the Internet.
These systems call for email senders to publish the IP addresses of their outgoing mail servers in their DNS records
. Recipient mail servers check the DNS to see if the sending IP and the authorized IP match before accepting the email.
Security researcher Graham Cluley (http://grahamcluley.com/2013/10/avg-website-palestinian-hackers/) said : It's possible that the hackers managed to change the website's DNS records
, redirecting anyone who attempted to visit www.whatsapp.com to a different IP address."
A status update from Twitter (http://status.twitter.com/post/59528478030/twitter-service-issue) confirmed the attack, stating "our DNS provider [Melbourne IT] experienced an issue in which it appears DNS records
for various organisations were modified, including one of Twitter's domains used for image service, twimg.com.