Ahana Datta reports:
One day last summer, I noticed that one of our Middle East correspondents was visiting the Financial Times newsroom. I’m head of cyber security at the paper, and I have found that foreign correspondents are often at the tip of the spear for strange and interesting threats. So I stopped to chat.
The correspondent, who I will not name for reasons that will soon become clear, mentioned that in recent weeks they had been receiving mysterious WhatsApp calls. The numbers were unrecognized. Afterward, their phone battery had drained quickly. And they were sometimes unable to end other calls, because the screen seemed to freeze.
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