Visitors to the websites of Vodafone, the Daily Telegraph, UPS and 4 others were re-directed to a site set up by Turkish hackers on Sunday night.
The obstruct was the outcome of the group's assault on computers that grip web residence information.
Real URL names were intentionally mistranslated in to the IP residence of the hackers' site.
No information from the 7 victims was mislaid or compromised as a outcome of the attack.
The hacking group, called Turkguvenligi, targeted the net's Domain Name System (DNS).
This acts as an residence book is to web and turns the names that people use (e.g. bbc.co.uk) in to IP residence figures that computers comprehend (e.g. 212.58.246.90).
DNS is consulted by a person's web browser when they wish to revisit a specific site.
In its attack, the Turkguvenligi organisation altered the archives relating to 7 sites in DNS databases run by NetNames and Ascio - two subsidiaries of domain name administration definite Group NBT.
In an talk with The Guardian , Turkguvenligi suggested that it got access to the files using a timeless assault way well known as SQL injection.
It mentioned it had targeted the sites and found that aggressive their DNS archives was the easiest way to accomplish their ends.
"The hardest a is reaching the domain company but if you can come after there will be a value for you," Turkguvenligi told The Guardian.
According to Zone-H , that logs website defacements and penetrate attacks, Turkguvenligi has carried out 186 defacements given late 2008.
In a DNS attack, the sites targeted are not affected at all. The usually repercussions is for visitors who will be re-directed to a site they were not expecting.
A matter by The Register about the assault suggests the re-direct was active for about 3 hours.
Writing on the blog of safety company Sophos, Graham Cluley mentioned : "We have to be thankful that the summary displayed appears to be graffiti, rsther than than an endeavor to phish information from users or setup malware."
When contacted by the BBC, a orator for Group NBT mentioned it would let go an authorized matter soon.
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