Sources familiar with WhatsApp’s internal investigation into the breach said a “significant” portion of the known victims were high-profile government and military officials spread across at least 20 countries in five continents.
The hacking of a wider group of top government officials' smartphones than previously reported suggests the WhatsApp cyber intrusion could have broad political and diplomatic consequences.
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While it is not clear who used the software to hack officials' phones, NSO says it sells its spyware exclusively to government customers.
Some victims are in the US, United Arab Emirates, Bahrain, Mexico, Pakistan and India, said people familiar with the investigation. Reuters could not verify whether victims from these countries included government officials.
The revelation comes as more than a dozen Indian journalists and human rights activists said on Thursday they were also targeted.
NSO did not immediately respond to a request for comment.
Previously, it has denied any wrongdoing, saying its products were only meant to help governments catch terrorists and criminals.
Over several past years, cybersecurity researchers have found NSO products used against a wide range of targets, including protesters in countries under authoritarian rule. The use of these tools to target high-profile politicians, however, is less understood.
An independent research group working with WhatsApp, named CitizenLab, said at least 100 of the victims were journalists and dissidents, not criminals.
WhatsApp has said it sent warning notifications to affected users earlier this week.
“It is an open secret that many technologies branded for law enforcement investigations are used for state-on-state and political espionage,” said John Scott-Railton, a senior researcher with CitizenLab.
WhatsApp did not identify the clients of NSO Group, who ultimately chose the targets.
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