"There have been increasing efforts to carry out cyber attacks on Israel's computer infrastructure," Prime Minister Benjamin Netanyahu said earlier this month, without giving details.
Netanyahu spoke just days after Washington issued a veiled warning to Iran over digital attacks and outlined a new digital warfare doctrine.
U.S. Defense Secretary Leon Panetta also referred publicly for the first time about the "Shamoon" virus that hit Saudi Arabia's state oil company Aramco in August, disabling more than 300,000 computers.
The virus also hit Rasgas, a joint venture between US oil firm Exxon Mobil Corp and state-controlled Qatar Petroleum.
Panetta called the sophisticated virus "the most destructive attack that the private sector has seen to date."
It took Aramco, the world's biggest oil company, two weeks after the August 15 attack to restore its main internal network, but the group said that oil production had not been disrupted.
However the threat that digital attacks could cripple vital infrastructure is real, with Panetta warning of the possibility of a "cyber-Pearl Harbor" to justify a policy of moving aggressively against threats.
A disruption to Saudi Arabia's oil exports could cause oil prices to spike from their already elevated prices and tip the fragile global economy into recession.
In what was interpreted as a veiled threat against Iran, Panetta said the U.S. military "has developed the capability to conduct effective operations to counter (cyber) threats to our national interests."
A senior U.S. administration official, who spoke on condition of anonymity, told AFP the cyber-attack on the Gulf oil giants was believed to be carried out by a "state actor" and acknowledged that Iran would be a prime suspect.
U.S. officials have "more than a suspicion" that Iran was to blame for the August attacks, said James Lewis, who has worked for the State Department and other government agencies on national security and cyber issues and who is now a senior fellow at the Center for Strategic and International Studies think tank.
He said the U.S. authorities were used to cyber espionage from Russia and China, but were surprised by the swift rise in Iran's digital warfare capability.
"A lot of people didn't think it would develop this quickly," he said.
However it is unsurprising that Iran would seek a cyber-warfare capability after having hundreds of centrifuges used to enrich uranium ruined by the Stuxnet virus in 2010.
Stuxnet marked a transformation for computer viruses, which had previously been used for spying or by organized crime, into a tool for sabotage.
It is widely suspected to have been the work of the United States and Israel, which believe Iran's nuclear program aims to produce a bomb.
Tehran insists its nuclear program is for peaceful uses only. Iran has been victim of other digital attacks as well.
In April it was forced to unplug computers at its Kharg oil terminal from the Internet after they came under cyber-attack, and in November last year an explosion at a missile terminal was attributed by U.S. media to a computer virus.
Only 'scratched the surface' of cyber warfare in Middle East
Kaspersky Labs, which detected the "Flame" and "Gauss" viruses believed behind those attacks, announced Monday it had found a new cyber espionage weapon it dubbed "miniFlame."
It described the virus as "a high precision, surgical attack tool ... designed to steal data and control infected systems during targeted cyber espionage operations."
Kaspersky said "we have only just scratched the surface of the massive cyber espionage operations ongoing in the Middle East. Their full purpose remains obscure and the identity of the victims and the attackers remains unknown."
Christian Harbulot, the head of the Economic Warfare School in Paris, warned that "it is extremely difficult to undo the knot" in what is also a propaganda war.
He said Iran could be behind the "Shamoon" virus, but that "it could be an additional pretext to weaken Iran" which is already under international embargo over its nuclear program.
For Nicolas Arpagian at France's National Institute of Advanced Security and Justice Studies, the latest attacks "show that arsenal of digital weapons is getting bigger, and that when you have such an arsenal the use of cyber weapons is bound to become more commonplace."
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