Cybersecurity firm Kaspersky Lab finds three hotels that hosted Iran talks were targeted by a virus believed to be used by Israeli spies

When a leading cybersecurity firm discovered it had been hacked last year by a virus widely believed to be used by Israeli spies, it wanted to know who else was on the hit list. It checked millions of computers world-wide and three luxury European hotels popped up. The other hotels the firm tested�thousands in all�were clean.

Researchers at the firm, Kaspersky Lab ZAO, weren�t sure what to make of the results. Then they realized what the three hotels had in common. Each was targeted before hosting high-stakes negotiations between Iran and world powers over curtailing Tehran�s nuclear program.

The spyware, the firm has now concluded, was an improved version of Duqu, a virus first identified by cybersecurity experts in 2011, according to a Kaspersky report reviewed by The Wall Street Journal and outside security experts. Current and former U.S. officials and many cybersecurity experts believe Duqu was designed to carry out Israel�s most sensitive intelligence-collection operations.

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