Turkish hackers hijacked some 350 Israeli websites on Sunday evening, lunching a Domain Name System (DNS) attack on dozens of other websites as well.
IT experts Yedioth Ahronoth on Tuesday that there is some concern that the DNS hijacking was, in fact, a "test-run" ahead of a major attack on Israeli domains.
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Visitors to some of the sites were diverted to a page declaring it was “World Hackers Day."
At least seven high-profile websites were hijacked, including those of The Telegraph, Acer, National Geographic, UPS and Vodafone.
Hackers calling themselves the "TurkGuvenligi group" calimd the cyber-attack. "TurkGuvenligi translates as "Turkish security."
"The hack represents a 10%-15% spike compared to the average number of daily hacks of Israeli websites," Shai Blitzblau, head of Maglan-Computer Warfare and Network Intelligence Labs, explained.
The operation was very sophisticated and probably entailed a significant financial investment, Blitzblau added.
The Israeli inquiry into the hack discovered a clear link to "TurkGuvenligi," as well as several failed attempts to hack other websites.
Ilil Ben Zur Laron of Yedioth Ahronoth contributed to this report
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