DNS pharming attacks target .com domain

A new attack on the domain name system redirects some requests for .com Web sites to malicious Web pages.

A new round of so-called "pharming" attacks is targeting the .com Internet domain, redirecting some Internet users who are looking for .com Web sites to Web pages controlled by the unknown attackers.

The SANS Institute's Internet Storm Center (ISC) issued a warning on Thursday about the new attacks, which corrupt some DNS (domain name system) servers so that requests for .com sites sent to those servers connect users instead to Web sites maintained by the attackers. News of the new attacks comes amid increasing reports of pharming scams, and statistics that show at least 1,300 Internet domains were redirected to compromised Web servers in a similar attack earlier in early March.

ISC advised network operators to block traffic to and from the IP (Internet Protocol) addresses involved in the attack to stop the redirection, according to information posted on the ISC Web site.

DNS is a global network of computers that translates requests for reader-friendly Web domains, such as www.computerworld.com.au, into the numeric IP addresses that machines on the Internet use to communicate.

The latest attack use a strategy called DNS cache poisoning, in which malicious hackers use a DNS server they control to feed erroneous information to other DNS servers. The attacks take advantage of a vulnerable feature of DNS that allows any DNS server that receives a request about the IP address of a Web domain to return information about the address of other Web domains.

Internet users who rely on a poisoned DNS server to manage their Web surfing requests might find that entering the URL (uniform resource locator) of a well-known Web site directs them to an unexpected or malicious Web page.

Pharming attacks are similar to phishing identity theft attacks, but don't require a "lure," such as a Web link that victims must click on to be taken to the attack Web site. The attacks have been increasing in recent months, as Internet users become more savvy about traditional phishing scams and online criminal groups look for new ways to collect sensitive information or financial data from victims, according to The Anti-Phishing Working Group.

In the latest attack, a rogue DNS server posed as the authoritative DNS server for the entire .com Web domain. Other DNS servers that were poisoned with this false information redirected all .com requests to the rogue server, which responded to all .com requests with one of two IP addresses. Web pages at those addressed displayed a search engine and an advertisement for a Web site, www.privacycash.com.

Neither Web page used in the attack was available early on Friday.

In a similar DNS cache poisoning attack in early March, requests from more than 900 unique Internet addresses and more than 75,000 e-mail messages were redirected, according to log data obtained from compromised Web servers that were used in the attacks, ISC said.

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.
Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Paul Roberts

IDG News Service
Show Comments

Cool Tech

Bang and Olufsen Beosound Stage - Dolby Atmos Soundbar

Learn more >

Toys for Boys

ASUS ROG, ACRONYM partner for Special Edition Zephyrus G14

Learn more >

Nakamichi Delta 100 3-Way Hi Fi Speaker System

Learn more >

Sony WF-1000XM3 Wireless Noise Cancelling Headphones

Learn more >

Family Friendly

Philips Sonicare Diamond Clean 9000 Toothbrush

Learn more >

Mario Kart Live: Home Circuit for Nintendo Switch

Learn more >

Stocking Stuffer

Teac 7 inch Swivel Screen Portable DVD Player

Learn more >

SunnyBunny Snowflakes 20 LED Solar Powered Fairy String

Learn more >

Christmas Gift Guide

Click for more ›

Brand Post

Shining a light on creativity

MSI has long pushed the boundaries of invention with its ever-evolving range of laptops but it has now pulled off a world first with the new MSI Creative 17.

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Tom Pope

Dynabook Portégé X30L-G

Ultimately this laptop has achieved everything I would hope for in a laptop for work, while fitting that into a form factor and weight that is remarkable.

Tom Sellers

MSI P65

This smart laptop was enjoyable to use and great to work on – creating content was super simple.

Lolita Wang

MSI GT76

It really doesn’t get more “gaming laptop” than this.

Jack Jeffries

MSI GS75

As the Maserati or BMW of laptops, it would fit perfectly in the hands of a professional needing firepower under the hood, sophistication and class on the surface, and gaming prowess (sports mode if you will) in between.

Taylor Carr

MSI PS63

The MSI PS63 is an amazing laptop and I would definitely consider buying one in the future.

Christopher Low

Brother RJ-4230B

This small mobile printer is exactly what I need for invoicing and other jobs such as sending fellow tradesman details or step-by-step instructions that I can easily print off from my phone or the Web.

Featured Content

Product Launch Showcase

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?